mirror of
https://github.com/devbridge/jQuery-Autocomplete.git
synced 2024-12-23 11:28:53 +00:00
563 lines
18 KiB
JavaScript
563 lines
18 KiB
JavaScript
/**
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* Ajax Autocomplete for jQuery, version 1.2
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* (c) 2012 Tomas Kirda
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*
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* Ajax Autocomplete for jQuery is freely distributable under the terms of an MIT-style license.
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* For details, see the web site: http://www.devbridge.com/projects/autocomplete/jquery/
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*
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* Last Review: 12/19/2012
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*/
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/*jslint browser: true, white: true, plusplus: true, vars: true */
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/*global window: true, document: true, clearInterval: true, setInterval: true, jQuery: true */
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(function ($) {
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'use strict';
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var utils = (function () {
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return {
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extend: function (target, source) {
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return $.extend(target, source);
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},
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addEvent: function (element, eventType, handler) {
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if (element.addEventListener) {
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element.addEventListener(eventType, handler, false);
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} else if (element.attachEvent) {
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element.attachEvent('on' + eventType, handler);
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} else {
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throw new Error('Browser doesn\'t support addEventListener or attachEvent');
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}
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},
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removeEvent: function (element, eventType, handler) {
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if (element.removeEventListener) {
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element.removeEventListener(eventType, handler, false);
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} else if (element.detachEvent) {
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element.detachEvent('on' + eventType, handler);
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}
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},
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createNode: function (html) {
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var div = document.createElement('div');
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div.innerHTML = html;
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return div.firstChild;
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}
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};
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}());
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function Autocomplete(el, options) {
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var that = this,
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defaults = {
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serviceUrl: null,
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lookup: null,
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onSelect: null,
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width: 'auto',
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minChars: 1,
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maxHeight: 300,
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deferRequestBy: 0,
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params: {},
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formatResult: Autocomplete.formatResult,
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delimiter: null,
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zIndex: 9999,
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type: 'GET',
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noCache: false
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};
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// Shared variables:
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that.element = el;
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that.el = $(el);
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that.suggestions = [];
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that.badQueries = [];
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that.selectedIndex = -1;
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that.currentValue = that.element.value;
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that.intervalId = 0;
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that.cachedResponse = [];
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that.onChangeInterval = null;
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that.onChange = null;
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that.ignoreValueChange = false;
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that.isLocal = false;
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that.suggestionsContainer = null;
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that.options = defaults;
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that.classes = {
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selected: 'autocomplete-selected',
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suggestion: 'autocomplete-suggestion'
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};
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// Initialize and set options:
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that.initialize();
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that.setOptions(options);
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}
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Autocomplete.utils = utils;
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$.Autocomplete = Autocomplete;
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Autocomplete.formatResult = function (suggestion, currentValue) {
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var reEscape = new RegExp('(\\' + ['/', '.', '*', '+', '?', '|', '(', ')', '[', ']', '{', '}', '\\'].join('|\\') + ')', 'g'),
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pattern = '(' + currentValue.replace(reEscape, '\\$1') + ')';
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return suggestion.value.replace(new RegExp(pattern, 'gi'), '<strong>$1<\/strong>');
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};
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Autocomplete.prototype = {
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killerFn: null,
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initialize: function () {
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var that = this,
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suggestionSelector = '.' + that.classes.suggestion;
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// Remove autocomplete attribute to prevent native suggestions:
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this.element.setAttribute('autocomplete', 'off');
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this.killerFn = function (e) {
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if ($(e.target).closest('.autocomplete').length === 0) {
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that.killSuggestions();
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that.disableKillerFn();
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}
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};
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// Determine suggestions width:
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if (!this.options.width || this.options.width === 'auto') {
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this.options.width = this.el.outerWidth();
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}
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this.suggestionsContainer = Autocomplete.utils.createNode('<div class="autocomplete-suggestions" style="position: absolute; display: none;"></div>');
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var container = $(this.suggestionsContainer);
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container.appendTo('body').width(this.options.width);
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// Listen for mouse over event on suggestions list:
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container.on('mouseover', suggestionSelector, function () {
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that.activate($(this).data('index'));
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});
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// Listen for click event on suggestions list:
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container.on('click', suggestionSelector, function () {
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that.select($(this).data('index'));
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});
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this.fixPosition();
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// Opera does not like keydown:
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if (window.opera) {
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this.el.on('keypress', function (e) { that.onKeyPress(e); });
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} else {
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this.el.on('keydown', function (e) { that.onKeyPress(e); });
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}
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this.el.on('keyup', function (e) { that.onKeyUp(e); });
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this.el.on('blur', function () { that.onBlur(); });
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this.el.on('focus', function () { that.fixPosition(); });
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},
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onBlur: function () {
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this.enableKillerFn();
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},
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setOptions: function (suppliedOptions) {
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var options = this.options;
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utils.extend(options, suppliedOptions);
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this.isLocal = $.isArray(options.lookup);
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if (this.isLocal) {
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options.lookup = this.verifySuggestionsFormat(options.lookup);
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}
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// Adjust height, width and z-index:
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$(this.suggestionsContainer).css({
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'max-height': options.maxHeight + 'px',
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'width': options.width + 'px',
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'z-index': options.zIndex
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});
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},
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clearCache: function () {
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this.cachedResponse = [];
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this.badQueries = [];
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},
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disable: function () {
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this.disabled = true;
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},
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enable: function () {
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this.disabled = false;
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},
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fixPosition: function () {
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var offset = this.el.offset();
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$(this.suggestionsContainer).css({
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top: (offset.top + this.el.outerHeight()) + 'px',
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left: offset.left + 'px'
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});
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},
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enableKillerFn: function () {
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var that = this;
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$(document).on('click', that.killerFn);
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},
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disableKillerFn: function () {
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var that = this;
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$(document).off('click', that.killerFn);
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},
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killSuggestions: function () {
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var that = this;
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that.stopKillSuggestions();
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that.intervalId = window.setInterval(function () {
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that.hide();
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that.stopKillSuggestions();
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}, 300);
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},
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stopKillSuggestions: function () {
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window.clearInterval(this.intervalId);
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},
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onKeyPress: function (e) {
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// If suggestions are hidden and user presses arrow down, display suggestions:
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if (!this.disabled && !this.visible && e.keyCode === 40 && this.currentValue) {
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this.suggest();
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return;
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}
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if (this.disabled || !this.visible) {
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return;
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}
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switch (e.keyCode) {
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case 27: //KEY_ESC:
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this.el.val(this.currentValue);
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this.hide();
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break;
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case 9: //KEY_TAB:
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case 13: //KEY_RETURN:
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if (this.selectedIndex === -1) {
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this.hide();
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return;
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}
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this.select(this.selectedIndex);
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if (e.keyCode === 9) {
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return;
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}
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break;
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case 38: //KEY_UP:
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this.moveUp();
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break;
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case 40: //KEY_DOWN:
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this.moveDown();
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break;
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default:
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return;
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}
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// Cancel event if function did not return:
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e.stopImmediatePropagation();
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e.preventDefault();
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},
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onKeyUp: function (e) {
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if (this.disabled) {
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return;
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}
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switch (e.keyCode) {
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case 38: //KEY_UP:
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case 40: //KEY_DOWN:
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return;
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}
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var that = this;
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clearInterval(that.onChangeInterval);
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if (that.currentValue !== that.el.val()) {
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if (that.options.deferRequestBy > 0) {
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// Defer lookup in case when value changes very quickly:
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that.onChangeInterval = setInterval(function () {
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that.onValueChange();
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}, that.options.deferRequestBy);
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} else {
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that.onValueChange();
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}
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}
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},
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onValueChange: function () {
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clearInterval(this.onChangeInterval);
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this.currentValue = this.element.value;
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var q = this.getQuery(this.currentValue);
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this.selectedIndex = -1;
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if (this.ignoreValueChange) {
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this.ignoreValueChange = false;
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return;
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}
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if (q === '' || q.length < this.options.minChars) {
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this.hide();
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} else {
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this.getSuggestions(q);
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}
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},
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getQuery: function (value) {
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var delimiter = this.options.delimiter,
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parts;
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if (!delimiter) {
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return $.trim(value);
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}
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parts = value.split(delimiter);
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return $.trim(parts[parts.length - 1]);
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},
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getSuggestionsLocal: function (q) {
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q = q.toLowerCase();
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return {
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suggestions: $.grep(this.options.lookup, function (suggestion) {
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return suggestion.value.toLowerCase().indexOf(q) !== -1;
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})
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};
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},
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getSuggestions: function (q) {
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var response,
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that = this,
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options = that.options;
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response = that.isLocal ? that.getSuggestionsLocal(q) : that.cachedResponse[q];
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if (response && $.isArray(response.suggestions)) {
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that.suggestions = response.suggestions;
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that.suggest();
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} else if (!that.isBadQuery(q)) {
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that.options.params.query = q;
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$.ajax({
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url: options.serviceUrl,
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data: options.params,
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type: options.type,
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dataType: 'text'
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}).done(function (txt) {
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that.processResponse(txt);
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});
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}
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},
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isBadQuery: function (q) {
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var badQueries = this.badQueries,
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i = badQueries.length;
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while (i--) {
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if (q.indexOf(badQueries[i]) === 0) {
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return true;
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}
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}
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return false;
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},
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hide: function () {
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this.visible = false;
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this.selectedIndex = -1;
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$(this.suggestionsContainer).hide();
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},
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suggest: function () {
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if (this.suggestions.length === 0) {
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this.hide();
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return;
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}
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var formatResult = this.options.formatResult,
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value = this.getQuery(this.currentValue),
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className = this.classes.suggestion,
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classSelected = this.classes.selected,
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container = $(this.suggestionsContainer),
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html = '';
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// Build suggestions inner HTML:
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$.each(this.suggestions, function (i, suggestion) {
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html += '<div class="' + className + '" data-index="' + i + '">' + formatResult(suggestion, value) + '</div>';
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});
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container.html(html).show();
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this.visible = true;
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// Select first value by default:
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this.selectedIndex = 0;
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container.children().first().addClass(classSelected);
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},
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verifySuggestionsFormat: function (suggestions) {
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// If suggestions is string array, convert them to supported format:
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if (suggestions.length && typeof suggestions[0] === 'string') {
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return $.map(suggestions, function (value) {
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return { value: value, data: null };
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});
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}
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return suggestions;
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},
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processResponse: function (text) {
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var response = $.parseJSON(text);
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response.suggestions = this.verifySuggestionsFormat(response.suggestions);
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// Cache results if cache is not disabled:
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if (!this.options.noCache) {
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this.cachedResponse[response.query] = response;
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if (response.suggestions.length === 0) {
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this.badQueries.push(response.query);
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}
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}
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// Display suggestions only if returned query matches current value:
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if (response.query === this.getQuery(this.currentValue)) {
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this.suggestions = response.suggestions;
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this.suggest();
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}
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},
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activate: function (index) {
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var activeItem,
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selected = this.classes.selected,
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container = $(this.suggestionsContainer),
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children = container.children();
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container.children('.' + selected).removeClass(selected);
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this.selectedIndex = index;
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if (this.selectedIndex !== -1 && children.length > this.selectedIndex) {
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activeItem = children.get(this.selectedIndex);
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$(activeItem).addClass(selected);
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return activeItem;
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}
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return null;
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},
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select: function (i) {
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var selectedValue = this.suggestions[i];
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if (selectedValue) {
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this.el.val(selectedValue);
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this.ignoreValueChange = true;
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this.hide();
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this.onSelect(i);
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}
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},
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moveUp: function () {
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if (this.selectedIndex === -1) {
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return;
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}
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if (this.selectedIndex === 0) {
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$(this.suggestionsContainer).children().first().removeClass(this.classes.selected);
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this.selectedIndex = -1;
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this.el.val(this.currentValue);
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return;
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}
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this.adjustScroll(this.selectedIndex - 1);
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},
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moveDown: function () {
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if (this.selectedIndex === (this.suggestions.length - 1)) {
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return;
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}
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this.adjustScroll(this.selectedIndex + 1);
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},
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adjustScroll: function (index) {
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var activeItem = this.activate(index),
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offsetTop,
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upperBound,
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lowerBound,
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heightDelta = 25;
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if (!activeItem) {
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return;
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}
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offsetTop = activeItem.offsetTop;
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upperBound = $(this.suggestionsContainer).scrollTop();
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lowerBound = upperBound + this.options.maxHeight - heightDelta;
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if (offsetTop < upperBound) {
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$(this.suggestionsContainer).scrollTop(offsetTop);
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} else if (offsetTop > lowerBound) {
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$(this.suggestionsContainer).scrollTop(offsetTop - this.options.maxHeight + heightDelta);
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}
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this.el.val(this.getValue(this.suggestions[index].value));
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},
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onSelect: function (index) {
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var that = this,
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onSelectCallback = that.options.onSelect,
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suggestion = that.suggestions[index];
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that.el.val(that.getValue(suggestion.value));
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if ($.isFunction(onSelectCallback)) {
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onSelectCallback.call(that.element, suggestion);
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}
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},
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getValue: function (value) {
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var that = this,
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delimiter = that.options.delimiter,
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currentValue,
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parts;
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if (!delimiter) {
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return value;
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}
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currentValue = that.currentValue;
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parts = currentValue.split(delimiter);
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if (parts.length === 1) {
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return value;
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}
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return currentValue.substr(0, currentValue.length - parts[parts.length - 1].length) + value;
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}
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};
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// Create chainable jQuery plugin:
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$.fn.autocomplete = function (options, args) {
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return this.each(function () {
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var dataKey = 'autocomplete',
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inputElement = $(this),
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instance;
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if (typeof options === 'string') {
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instance = inputElement.data(dataKey);
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if (typeof instance[options] === 'function') {
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instance[options](args);
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}
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} else {
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instance = new Autocomplete(this, options);
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inputElement.data(dataKey, instance);
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}
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});
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};
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}(jQuery));
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