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Fix CSS & JavaScript injection (Fixes #703, Fixes #731, PR #732)

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* Fix for CSS Injection not working (#703)

Issue:
When using `onHeadersReceived`, the code was passing `null` for the filters.
This appears to trigger behaviour that matches _no_ urls at all.
This results in it never being called to inject the CSS.

Fix:
Pass an empty array instead. Now it's called for all URLs.

Tests pass & linting is clean

* Fix JavaScript injection (#731)

Issue:
It appears that on low endd evices (Core m3 MacBook), the attachment to
`DOMContentLoaded` happens _after_ the event has been raised, so does
not have a chance to inject the script.

Fix:
Move the attachment to the top of the file -- before the imports. This
triggers a bunch of linting erros, so also added disablement inplace.

Additional:
Clarified when the injected JS gets loaded, and what it can assume about
the DOM.
This commit is contained in:
Dominic Hopton 2019-01-01 20:38:45 -08:00 committed by Ronan Jouchet
parent 9acd85bb65
commit e064f765cb
3 changed files with 21 additions and 10 deletions
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6
app/src/components/mainWindow/mainWindow.js
View File

@ -55,10 +55,10 @@ function maybeInjectCss(browserWindow) {
// on every page navigation inject the css
browserWindow.webContents.on('did-navigate', () => {
// we have to inject the css in onHeadersReceived to prevent the fouc
// will run multiple times
// we have to inject the css in onHeadersReceived so they're early enough
// will run multiple times, so did-finish-load will remove this handler
browserWindow.webContents.session.webRequest.onHeadersReceived(
null,
[], // Pass an empty filter list; null will not match _any_ urls
onHeadersReceived,
);
});

23
app/src/static/preload.js
View File

@ -1,9 +1,22 @@
/**
Preload file that will be executed in the renderer process
*/
import { ipcRenderer } from 'electron';
import path from 'path';
import fs from 'fs';
/**
* Note: This needs to be attached prior to the imports, as the they will delay
* the attachment till after the event has been raised.
*/
document.addEventListener('DOMContentLoaded', () => {
// Due to the early attachment, this triggers a linter error
// because it's not yet been defined.
// eslint-disable-next-line no-use-before-define
injectScripts();
});
// Disable imports being first due to the above event attachment
import { ipcRenderer } from 'electron'; // eslint-disable-line import/first
import path from 'path'; // eslint-disable-line import/first
import fs from 'fs'; // eslint-disable-line import/first
const INJECT_JS_PATH = path.join(__dirname, '../../', 'inject/inject.js');
const log = require('loglevel');
@ -49,10 +62,6 @@ function notifyNotificationClick() {
setNotificationCallback(notifyNotificationCreate, notifyNotificationClick);
document.addEventListener('DOMContentLoaded', () => {
injectScripts();
});
ipcRenderer.on('params', (event, message) => {
const appArgs = JSON.parse(message);
log.info('nativefier.json', appArgs);

2
docs/api.md
View File

@ -396,6 +396,8 @@ Forces the maximum disk space to be used by the disk cache. Value is given in by
Allows you to inject a javascript or css file. This command can be run multiple times to inject the files.
_Note:_ The javascript file is loaded _after_ `DOMContentLoaded`, so you can assume the DOM is complete & available.
Example:
```bash