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Jun 30, 2009

Get query string value using JavaScript

Here is the JavaScript function getQuerystring which finds the key form query string and returns the value.

/*
* <summary>
* Get the querystring value
* </summary>
* <param name="key">A string contains the querystring key</param>
* <param name="defaultVal">Object which get returns when there is not key</param>
**/
function getQuerystring(key, defaultVal) {
if (defaultVal == null) {
defaultVal = "";
}
key = key.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
var regex = new RegExp("[\\?&]" + key + "=([^&#]*)");
var qs = regex.exec(window.location.href);
if (qs == null) {
return defaultVal;
}
else {
return qs[1];
}
}

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