b1conrad.github.io/jqvsjs.html at master · b1conrad/b1conrad.github.io · GitHub

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<!DOCTYPE HTML>
<html>
<head>
<title>jquery vs javascript</title>
<meta charset="UTF-8">
<style type="text/css">
pre span { background-color: lightskyblue; }
.advanced { background-color: white; visibility: hidden; }
.fixed { visibility: visible; }
.code { background-color: white; font-family: courier, sans-serif; font-size: 80%; }
p { font-family: courier, sans-serif; }
</style>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
</head>
<body>
<p><script type="text/javascript">document.write(location.href)</script></p>
<table>
<tr>
<th>JQuery</th>
<th>JavaScript</th>
</tr>
<tr>
<td>requires jQuery library (70K (24K zipped))</td>
<td>requires no extra library</td>
</tr>
<tr>
<td valign="top" style="border-right:1px dashed silver">
<pre>
<span>&lt;script type="text/javascript"></span>
$("document").ready(function(){
  var $prefix = $("#prefix");
  $prefix<span>.focus();</span>
  var $cities = $("#city-list li");
<span>  var markMatches = function() {</span>
    $cities.removeClass("match");


    var thePrefix = $prefix.val()<span>.toLowerCase();</span>
<span>    if (thePrefix.length > 0) {</span>
      $cities.each(function(){
        if ($(this).text()<span>.toLowerCase().startsWith(thePrefix)) {</span>
          $(this).addClass("match");
<span>        }</span>
      });
<span>    }</span>
<span>  };</span>
  $prefix.keyup(<span>markMatches);</span>
});
<span>&lt;/script></span>
</pre>
</td>
<td valign="top">
<pre>
<span>&lt;script type="text/javascript"></span>
<span class="advanced">(function(){</span>
  var prefix = document.getElementById("prefix");
  prefix<span>.focus();</span>
  var cities = document.getElementById("city-list").children;
<span>  var markMatches = function() {</span>
    for (var i=0; i&lt;cities.length; ++i) {
      cities[i].className = "";
    }
    var thePrefix = prefix.value<span>.toLowerCase();</span>
<span>    if (thePrefix.length > 0) {</span>
      for (var i=0; i&lt;cities.length; ++i) {
        if (cities[i].textContent<span>.toLowerCase().startsWith(thePrefix)) {</span>
          cities[i].className = "match";
<span>        }</span>
      }
<span>    }</span>
<span>  };</span>
  prefix.addEventListener("keyup",<span>markMatches);</span>
<span class="advanced">}());</span>
<span>&lt;/script></span>
</pre>
</td>
</tr>
<tr>
<td>can place script in &lt;head> element</td>
<td>must place script at <em>end</em> of &lt;body> element</td>
</tr>
<tr>
<td>uses functional/callback style</td>
<td>uses imperative style</td>
</tr>
<tr>
<td>variables are contained in document ready function</td>
<td id="fix-td">variables <span class="code">prefix</span>, <span class="code">cities</span>, <span class="code">markMatches</span>, <span class="code">i</span>, <span class="code">thePrefix</span> are added to global namespace
<button id="fixer">fix</button>
</td>
</tr>
</table>
<script type="text/javascript">
  $("#fixer").click(function(){
    $(".advanced").toggleClass("fixed");
    $("#fix-td").html("variables are contained using an <em>immediately invoked function expression</em> (IIFE)");
  });
</script>
</body>
</html>