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Need help understanding jquery delegate() function
$(".some_element_class").delegate("a", "click", function(){

    alert($(this).html());

});

$(elements).delegate(selector, events, data, handler);  // jQuery 1.4.3+
$(elements).on(events, selector, data, handler);        // jQuery 1.7+

$(".some_element_class").on("a", "click", function(){

    alert($(this).html());

});

<div class="some_element_class">  <!-- delegate handler is here -->

    <div>won't trigger your handler</div>
    <a>will trigger your handler</a>
    <a><span>will trigger</span> your handler</a>

</div>

<div class="some_element_class">  <!-- delegate handler is here -->

    <div>won't trigger your handler</div>
    <a>will trigger your handler</a>
    <a><span>will trigger</span> your handler</a>

      <!-- this element newly added... -->
    <a><span>...will also trigger</span> your handler</a>

</div>

//Static event handlers for static links
$("a").bind("",linkHandler);

//Live event handlers for dynamic parts of the document
$(".dynamic").delegate("a", "mouseover", linkHandler);

$(".some_element_class").bind("click", function (e) {
    var matches = $(e.target).closest("a", this);
    if (matches.length) {
        yourcallback.call(matches[0], e);
    }
});