User:Writ Keeper/Scripts/previewAndDiff.js

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This code will be executed when previewing this page.

Documentation for this user script can be added at User:Writ Keeper/Scripts/previewAndDiff.

Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.

$(document).ready(function()
{
	if(mw.config.get("wgAction") === "edit" || mw.config.get("wgAction") === "submit" )
	{
		if(/previewanddiff=true/.test(window.location.href))
		{
			mw.loader.load('mediawiki.diff.styles');
			$("#wikiPreview").before('<h2>Your changes</h2><table class="diff" id="ajaxDiff"><colgroup><col class="diff-marker"><col class="diff-content"><col class="diff-marker"><col class="diff-content"></colgroup></table>');
			
			var diffData = {action:"query", prop:"revisions", format:"json", rvcontentformat:"text/x-wiki", revids:$("input[name='baseRevId']").attr("value"), rvdifftotext:$("textarea#wpTextbox1").text()};
			var wpSectionElement = $("input[name='wpSection']");
			if(typeof wpSectionElement.attr("value") !== "undefined")
			{
				diffData.rvsection = wpSectionElement.attr("value");
			}
			var mwApi = new mw.Api();
			mwApi.post(diffData).done(function (response)
			{
				$("#ajaxDiff").append(response.query.pages[Object.keys(response.query.pages)[0]].revisions[0].diff["*"]);
			});
		}

		mw.loader.using('oojs-ui').then(function () {
			var previewDiffButton = new OO.ui.ButtonInputWidget({label:'Show preview and changes', useInputTag: true, value: 'wpPreview', name: 'wpPreview', type:"submit", accessKey:"o", tabIndex: ($("#wpDiff").prop("tabIndex") + 1)});
			previewDiffButton.setTitle("Show a preview of your changes, as well as a diff of what you changed");
			
			$("#wpDiffWidget").after(previewDiffButton.$element);
			previewDiffButton.$element.children("input").click(function()
			{
				var formAction = $("#editform").attr("action");
				$("#editform").attr("action", formAction+"&previewanddiff=true");
			});
		});
	}
});