How to clear the contents of an iFrame from another iFrame

问题

I have a wrapperPage.html with an <iframe class="header" and <iframe class="pageBody". In header there is a link, <a class="clearLink", which when clicked should clear the contents of pageBody.

So far the following implementation of the above idea doesn't work. Please help me resolve this.

Please NOTE that, header and pageBody are each loaded from different included files.

wrapperPage.html

<div class=non-floater>
    <iframe class="header" src="header.html"></iframe>
    <iframe class="pageBody" src="pageBody.html" /> 
</div>

header.html :

<script type="text/javascript">
    $(document).ready(function() {
        $(".clearLink").on("click", function() {
            $('.pageBody').contents().find("body").html('');
        });
    });
</script>

<a class="clearLink" href="#">Navigation Button</a>

pageBody.html :

<div class="panel-body">This is the body</div>

回答1:

Try using Channel messaging

wrapperPage.html

<body>
<div class=non-floater>
    <iframe class="header" src="header.html"></iframe>
    <iframe class="pageBody" src="pageBody.html" /> 
</div>
<script>
  var channel = new MessageChannel();
  var header = $(".header")[0].contentWindow;
  var pageBody = $(".pageBody")[0].contentWindow;
  header.onload = function() {
    this.postMessage("","*", [channel.port2])
  };

  channel.port1.onmessage = function(e) {
    if (e.data === "clicked") {
      $(pageBody.document.body).html("")
    }
  }
</script>
</body>

header.html

<body>
<a class="clearLink" href="#">Navigation Button</a>
<script>
  var port;

  onmessage = function(e) {
    port = e.ports[0];
  }

  $(".clearLink").on("click", function(e) {
      port.postMessage("clicked");
  });
</script>
</body>