[wp-trac] [WordPress Trac] #48268: Updating failed. Error message: The response is not a valid JSON response.

[WordPress Trac]

#48268: Updating failed. Error message: The response is not a valid JSON response.
-------------------------------+------------------------------
 Reporter:  phpdocs            |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Posts, Post Types  |     Version:
 Severity:  critical           |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
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Comment (by stidch):

 I don't know if the issue I face is exactly the same, but at least looks
 similar.

 I cannot save any page, which contain a shortcode, which contain a call to
 a java-script method

 For example:

 {{{
 onload="resizeIframe(this)"
 }}}


 In my case I try to resize an iframe with the advanced-iframe plugin. The
 full shortcode looks like this:

 {{{
 advanced_iframe src="https://xxx.com/script.php?parameter=value"
 frameborder="0" scrolling="no" onload="resizeIframe(this)"
 }}}


 In an html block above I'v defined the resizeIframe method.

 {{{
 <script>
 function resizeIframe(iframe) {
   iframe.height = "10px" // required for reducing the size
   iframe.height = iframe.contentWindow.document.body.scrollHeight + "px";
 }
 </script>
 }}}


 If I remove the part

 {{{
 onload="resizeIframe(this)
 }}}

 from the shortcode I can successfully save the page. With I can't.

 I've tried already with disabled plugins and default theme.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48268#comment:7>
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