jQuery-等待元素显示在iFrame中并获取其值？

Question

Suppose upon an event an iframe opens. (no cross site, the iframe is part of the DOM).

So when the iframe opens it displays for example to select a file.

The second state of the iFrame upon selecting the file would be displaying information about the media uploaded as well as its title. Ex below after the file is selected.

My question is suppose I wanted to grab the value of 'Title' using JS. How would I go on doing this?

$('.addmediabutton').click(function() {

         $('body').on('DOMNodeInserted', 'iframe', function(e) {
           //How do I wait for eg. class = "title" to show up and grab its value? 

 });
});

Would I have to use a Mutation Observer above to track a given added node or element or is there an easier way.

If you need any further clarification please don't hesitate to ask.

Answer 1

如果在ajax调用之后到达第二种状态，则就像在ajax请求的on success部分中包含功能一样简单。