UW MapleTA inline equation preview

inline_equation_preview.user.js

// ==UserScript==
// @name        Inline equation preview
// @namespace   localhost
// @description Inline equation preview for MapleTA equation editor
// @include     https://maple-ta.uwaterloo.ca/mapleta/modules/*
// @version     0.1
// @grant       none
// @require http://userscripts.org/scripts/source/68059.user.js
// ==/UserScript==

$("input+a>img").parent().prev().each(function(i,e){
    var $img=$([]),$this=$(e).bind("change keyup keydown",function(e){
        $.get("/mapleta/modules/preview.Preview?eq="+encodeURIComponent($(this).val())+"&actionID=maple",function(html){
            var m=html.match(/img src="([^"]*(?:\\"[^"]*)*)"/i);
            if(!m)
                return;
            $img.remove();
            $img=$("<img>")
                .attr("src",m[1])
                .insertAfter($this)
                //.delay(3000)
                //    .hide(100);
        })
    }).change();
});