Jquery – Use jQuery to check if a URL on another domain is 404 or not

cross-sitejquery

On the client side using jQuery, I want to know if I can just check if a link URL is valid (i.e. doesn't return a 404). This link points to another domain, so if I just use $.get() then I end up with a permission issue. I remember reading something about using a JSONP request, but I don't remember.

Best Answer

I found a solution that seems to work (using YQL):

$.getJSON("http://query.yahooapis.com/v1/public/yql?"+
            "q=select%20*%20from%20html%20where%20url%3D%22"+
            encodeURIComponent(url)+
            "%22&format=xml'&callback=?",
    function(data){
      if(data.results[0]){
        // do whatever
      } 
    }
  );

Assumes the URL you want to check is in the variable 'url'.

Related Solutions

Javascript – How to check if an element is hidden in jQuery

Since the question refers to a single element, this code might be more suitable:

// Checks CSS content for display:[none|block], ignores visibility:[true|false]
$(element).is(":visible");

// The same works with hidden
$(element).is(":hidden");

It is the same as twernt's suggestion, but applied to a single element; and it matches the algorithm recommended in the jQuery FAQ.

We use jQuery's is() to check the selected element with another element, selector or any jQuery object. This method traverses along the DOM elements to find a match, which satisfies the passed parameter. It will return true if there is a match, otherwise return false.

Javascript – How to you check for a #hash in a URL using JavaScript

Simple use of location hash:

if(window.location.hash) {
  // Fragment exists
} else {
  // Fragment doesn't exist
}

Best Answer

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Javascript – How to check if an element is hidden in jQuery

Javascript – How to you check for a #hash in a URL using JavaScript

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