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    <p>First of all I explain why you code don't work like you expect.</p> <p>The method <code>$.get</code> works <em>asynchronous</em>. So</p> <ul> <li>your function <code>beforeSubmit</code> first start <code>$.get</code></li> <li>then it returns <code>undefined</code> value bacause the body of the <code>beforeSubmit</code> function will be finished.</li> <li>Then after the asynchronous <code>$.get</code> request will get response from the server the <code>function(data) {</code> callback will be called (it's <code>success</code> callback).</li> <li>Your <code>success</code> callback return the value <code>return[false,"Exists"];</code> <em>from the callback</em>. The <code>$.get</code> don't analyse any return value from the <code>success</code> callback so the array <code>[false,"Exists"]</code> will be discarded by <code>$.get</code>.</li> </ul> <p>You can use <code>$.ajax</code> with <code>async: false</code> parameter instead of <code>$.get</code> as the workaround, but better is don't implement any <code>beforeSubmit</code> at all. If your server-based code find out that the user changes can't be saved or the input field contains some validation errors the server should just return response having some <a href="http://en.wikipedia.org/wiki/List_of_HTTP_status_codes" rel="nofollow noreferrer">error HTTP status code</a>. The status code can be 400 or higher in case of validation errors - <a href="http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#4xx_Client_Error" rel="nofollow noreferrer">the Client Error</a> or be 500 or higher in case of some other errors in processing the request on the server - <a href="http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#5xx_Server_Error" rel="nofollow noreferrer">Server Error</a>. The body of the server response can be HTML fragment of the message which jqGrid will display to the user.</p> <p>You can customize the error message with respect of <code>errorTextFormat</code> callback. See <a href="https://stackoverflow.com/a/5103844/315935">here</a> and <a href="https://stackoverflow.com/a/6803206/315935">here</a> for additional information.</p>
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    1. COThanks a lot Oleg. I used afterSubmit as i found in another post and it worked.
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    2. CO@Theodore: You are welcome!
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