通过javascript从网站获取动态内容

Question

I am creating a firefox plugin and using javascript. I am using XMLHttpRequest to get dynamic content from a remote website and storing it into a file to parse it later. But in responseText i am not receiving any dynamic content. After storing information that i got is only the html page not having dynamic content.

code:

var res="";

var req = new XMLHttpRequest();

req.onload = function(){

res=this.responseText;
}   

req.open("GET","www.ebay.com", true);

req.send();

Answer 1

You can only fetch remote content under your own domain. This is a security issue. You can use JSONP , But for ebay I don't know if there are any json contents available. for more information have a look at this: http://www.devproconnections.com/article/aspnet2/ajax-cross-domain-142169

In the case you are using Javascript with a Chrome extension or a Firefox add-on, then you must set permissions in your manifest file to have access to those sites you want.

Answer 2

It's can't be done due to same-origin policy , so you can only request content within the origin domain.

Here are some links may be helpful to you:
Getting CORS Working
Cross-domain Ajax with Cross-Origin Resource Sharing

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Edit:
Since what you want to get from a website is generated by Ajax , so it's impossible to get the dynamic content. the dynamic content present on the website is after the browser loaded the html page and so the Javascript Event can be triggered to get the dynamic content through Ajax . You can get the html page, but you didn't get the Javascript files. therefor, Can't get the dynmic content.

sorry for my bad English