手风琴+附加内容Jquery

Question

So I have an accordion menu that I created with Jquery:

    <script>
$(document).ready(function() {
/*Accordian Script for the Request New Appraisal Panel*/
$('.accordian_item').hide();
$('.accordian_item').first().slideDown();

$('.accordian_trigger').click(function(event) {
    event.preventDefault();
    $(this).parent().find('.accordian_item').slideToggle();
});
});
</script>

Now, I want to be able to dynamically append extra accordion items to the accordion box, which I have done like this:

<script>

$('#add_contact_btn').click(function(event) {
    event.preventDefault();

    var large = '<div class="accordian_container"><a href="#" class="accordian_trigger"><h4>Co-Borrower Information</h4></a><hr/><div class="accordian_item"><label> First Name</label><br/><input type="text"/><br/><label>Middle Name</label><br/><input type="text"/><br/><label>Last Name</label><br/><input type="text" /><br/><label>Home Number</label><br/><input type="text"/><br><label>Work Number</label><br/><input type="text"/><br><label>Cell Number</label><br/><input type="text"/><br></div></div>';

    $('#accordion_container_box').append(large);


});
</script>

This works perfect, except the dynamically generated items don't collaps when you click on the collapse button. The existing accordion items still work. For some reason it seems like Jquery wont trigger for dynamically created links. Any ideas how I can correct this?

BTW, here is the basic HTML structure:

<div id="accordion_container_box">

            <div class="accordian_container">
                <a href="#" class="accordian_trigger"><h4>Borrower's Information</h4></a>
                <hr/>
                <div class="accordian_item">
                <label> First Name</label><br/>
                <input type="text"/><br/>
                <label>Middle Name</label><br/>
                <input type="text"/><br/>
                <label>Last Name</label><br/>
                <input type="text" /><br/>
                <label>Home Number</label><br/>
                <input type="text"/><br>
                <label>Work Number</label><br/>
                <input type="text"/><br>
                <label>Cell Number</label><br/>
                <input type="text"/><br>
                </div>
            </div>

            <div class="accordian_container">       
                <a href="#" class="accordian_trigger"><h4>Co-Borrower's Information</h4></a>
                <hr/>
                <div class="accordian_item">
                <label> First Name</label><br/>
                <input type="text"/><br/>
                <label>Middle Name</label><br/>
                <input type="text"/><br/>
                <label>Last Name</label><br/>
                <input type="text" /><br/>
                <label>Home Number</label><br/>
                <input type="text"/><br>
                <label>Work Number</label><br/>
                <input type="text"/><br>
                <label>Cell Number</label><br/>
                <input type="text"/><br>
                </div>
            </div>

        </div>

            <a href="#" id="add_contact_btn">+ Additional Contact</a>

Answer 1

你必须在动态创建的内容上使用.live（'click'...）。

Answer 2

By default binding events to elements will only affect nodes that exist at the time that the bind runs. By using event delegation you can make use of the built in way that events bubble. jQuery < 1.7 did this with the delegate and live methods, jQuery 1.7 added the on method to consolidate all the event handlers in a single API.

For example you could use the following to handle all clicks on nodes with a class of accordian_trigger regardless of when they were created.

​$(document).on('click', '.accordian_trigger', function() {
    //whatever you need to do
});​​​​​​​​​​​

What this will do is attach an onclick event handler to the document itself. When any click occurs in the DOM it will bubble up from the node that the event occurred on to its parent and its parent until it reaches the document . jQuery will then check whether the event occurred on a node that matches the selector passed in as the second parameter of on , in this case it will check whether the node has a class of accordian_trigger . If it does it will run the function passed in as the third parameter.

For efficiency's sake you'll likely want to replace document with a parent node that you know will contain all accordian_trigger nodes. Otherwise all clicks bubble all the way up to the document and check whether the node that was clicked on has the accordian_trigger class, which is potentially expensive, especially if you have a large DOM.