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How do I check if a call to window.location failed because the given URL was invalid, etc? Is there some event I can set on the window object or on some other object that can catch this?

How do I check if a call to window.location failed because the given URL was invalid, etc? Is there some event I can set on the window object or on some other object that can catch this?

• javascript
• dom-events
• window.location

Share Improve this question Follow edited Jan 3, 2022 at 19:22 Brian Tompsett - 汤莱恩 5,8837272 gold badges6161 silver badges133133 bronze badges asked Aug 23, 2013 at 13:31 Sagi MannSagi Mann 3,61099 gold badges4444 silver badges8181 bronze badges 0

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3 Answers 3

Sorted by: Reset to default 13

Finally got it to work using a "workaround" that is not a generic solution as I originally hoped:

I am using the fact that the link I am trying to open is a custom url scheme (e.g. myxx://localhost) on mobile, and if it fails, the action I want to perform is a redirection to a standard appstore URL (os-specific). The workaround tries to open the custom URL, and if it fails, the timeout function kicks in shortly after, and opens an alternative url:

setTimeout(function() { window.location=alternateUrl; }, 25);
window.location = customUrl;

The downside is that when the customURL fails, a standard safari browser shows a message box that the site could not be opened, but at least it still redirects the user to the appstore.

Not really possible, because when window.location = someURL is executed, before the URL is even tested, your document is removed from the window. You have no code remaining that could test if it worked.

If the link is on the same origin, you may issue an XMLHttpRequest to test if the page is reachable but there doesn't seem to be a way to test if a page isn't requestable just due to cross origin request or because the URL is wrong.

For a general document, I don't know any way to test if a foreign origin page is reachable (but it can be done for an image using the onload event handler).

you can check if page exists using ajax. didn't test code, but it should work.

var rekuest= new XMLHttpRequest();  
rekuest.open('GET', 'http://www.thisdoesnotexits.org', true);  
rekuest.send();  
if (rekuest.status === "404") {alert("not exist!"); }  

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