Simple jQuery ajax call doesn't work with rails

Question

I'm new to Rails and I was trying to right very simple ajax call in application.js.

Here's the code:

function login(loginUrl) {
    alert(loginUrl);

    $.ajax('http://www.w3schools.com/jquery/demo_test.txt', {success: function (result) {
        alert(result);
    }});
}

When the function is called, the first alert works well. However, it seems that the following ajax call never gets through and the second alert never executes. I tried the code at w3school.com and it works well. I'm really confused why this simple code doesn't work with Rails.

Could anyone please help me?

This is because of a browser restriction of ajax called `Same Origin Policy` http://en.wikipedia.org/wiki/Same_origin_policy — Arun P Johny, Mar 07 '13 at 04:35
@Cypher Please make your edits more substantial than a single typo. The questions you're editing also have a lot of other errors present you can fix at the same time. — doppelgreener, May 08 '14 at 04:40

score 0 · Accepted Answer · edited May 23 '17 at 10:25

This is because of a browser restriction called Same Origin Policy. It prevents javascript from sending ajax request to a domain different from where it is loaded.

In your case you are trying to access a resource (http://www.w3schools.com/jquery/demo_test.txt) hosted at http://www.w3schools.com but page which send the request is not from the same domain that is why the ajax request is not working.

If you look at your browser's console, you may be able to see an error saying the same.

A solution for Same Origin Policy is to use jsonp (What is JSONP all about?), but the constraint is the server should support jsonp.

I tried again and it works if I replace the external http address with loginUrl. Thanks a lot! :-) — user2142709, Mar 07 '13 at 04:45

score 0 · Answer 2 · answered Mar 07 '13 at 06:37

0

replace 'http://www.w3schools.com/jquery/demo_test.txt' this by your loginUrl

answered Mar 07 '13 at 06:37

Sachin R

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Simple jQuery ajax call doesn't work with rails

2 Answers2