仅在打开Bootstrap手风琴时加载iFrame

Question

I am trying to have the iframes inside the bootstrap 3 accordion to load only when the item is opened. Right now all iframes load at the same time when page loads and it causes the page to load for a long time. How to stop the iframes loading until the accordion item is opened?

Here is my collapse code:

<div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
<div class="panel panel-default">
    <div class="panel-heading" role="tab" id="heading1">
        <h4 class="panel-title">
            <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapse1" aria-expanded="false" aria-controls="collapse1">
                Title 1 goes here
            </a>
        </h4>
    </div>
    <div id="collapse1" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading1">
        <ul class="list-group">
            <li class="list-group-item"> <iframe src="http://www.google.com"></iframe> </li>
        </ul>
    </div>
</div>
<div class="panel panel-default">
    <div class="panel-heading" role="tab" id="heading2">
        <h4 class="panel-title">
            <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapse2" aria-expanded="false" aria-controls="collapse2">
                Title 2 goes here
            </a>
        </h4>
    </div>
    <div id="collapse2" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading2">
        <ul class="list-group">
            <li class="list-group-item"> <iframe src="http://www.yahoo.com"></iframe> </li>
        </ul>
    </div>
</div>

Answer 1

您可以将SRC属性保留为空白，然后挂钩/设置您自己的事件侦听器，以了解何时打开手风琴项目以设置iframe的SRC属性，然后