mediawiki.action.edit.editWarning.js
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mediawiki.action.edit.editWarning.js
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	/*
	* Javascript for module editWarning
	*/
	( function () {
	'use strict';

	$( () => {
	const $textBox = $( '#wpTextbox1' );
	const $summary = $( '#wpSummary' );
	const $both = $textBox.add( $summary );

	// Check if EditWarning is enabled and if we need it
	if ( !mw.user.options.get( 'useeditwarning' ) ) {
	return true;
	}

	// Save the original value of the text fields
	$both.each( ( index, element ) => {
	const $element = $( element );
	$element.data( 'origtext', $element.textSelection( 'getContents' ) );
	} );

	// This registers an event with the name "beforeunload.editwarning", which allows others to
	// turn the confirmation off with `$( window ).off( 'beforeunload.editwarning' );`.
	const allowCloseWindow = mw.confirmCloseWindow( {
	test: function () {
	// When the action is submit we're solving a conflict. Everything is a pending change there.
	return mw.config.get( 'wgAction' ) === 'submit' \|\|
	// We use .textSelection, because editors might not have updated the form yet.
	$textBox.data( 'origtext' ) !== $textBox.textSelection( 'getContents' ) \|\|
	$summary.data( 'origtext' ) !== $summary.textSelection( 'getContents' );
	},

	namespace: 'editwarning'
	} );

	// Add form submission handler
	$( '#editform' ).on( 'submit', () => {
	allowCloseWindow.release();
	} );
	} );

	}() );