Associations Race Condition Fix (#15948)

* Associations Race Condition Fix

* jQuery -> $

* make @dgt41 mappy by not using jQuery, even though the rest of the file does!

* Load Target Pane AFTER reference pane has loaded to prevent session conflict with checkout

administrator/components/com_associations/views/association/tmpl/edit.php

@@ -51,7 +51,7 @@ $options = array(
 					<?php echo $this->form->getInput('itemlanguage'); ?>
 				</div>
 				<iframe id="target-association" name="target-association"
-					src="<?php echo $this->defaultTargetSrc; ?>"
+					data-url="<?php echo $this->defaultTargetSrc; ?>"
 					height="400" width="400"
 					data-action="<?php echo $this->targetAction; ?>"
 					data-item="<?php echo $this->typeName; ?>"

media/com_associations/js/sidebyside-uncompressed.js

@@ -154,6 +154,10 @@ jQuery(document).ready(function($) {
 
 	// Attach behaviour to reference frame load event.
 	$('#reference-association').on('load', function() {
+
+		// Load Target Pane AFTER reference pane has loaded to prevent session conflict with checkout
+		document.getElementById('target-association').setAttribute('src', document.getElementById('target-association').getAttribute('data-url'));
+
 		// If copy button used
 		if ($(this).contents().find('#jform_id').val() !== this.getAttribute('data-id'))
 		{