This function will take a query string (or use the current URI if no string is supplied) and return the value of the chosen argument.
Code
function GetQueryValue(k,q) // Key, Query String { q=q||location.href; // uses current uri if no query is supplied var tmpNdx=q.indexOf('?'); if (tmpNdx!=-1) // If string has query information { q=q.slice(tmpNdx+1); // Remove all information except for query q=q.split('&'); // Create array of key/value pairs for (var i=0;i<q.length;i++) { var p=q[i].indexOf('='); if (p>0) { var thisk=q[i].substring(0,p); if (thisk==k) return q[i].substring(p+1); // return value } } return null; // If key doesn't exist, return null } else { return null; // If no query information, return null } }
Returns
- string | value of argument if exists
- null if argument doesn’t exist
Prototype
GetQueryValue(string key[, query string])
Note that the query string argument is optional. If no string is supplied, script will use the address of the page.
Samples
<script type="text/javascript" src="GetQueryValue.js"></script> // include the script <script type="text/javascript"> var myStr='http://www.mywebsite.com?var1=foo&var2=bar'; alert(GetQueryValue('var2',myStr)); // alerts bar alert(GetQueryValue('somevar',myStr)); // alerts null alert(GetQueryValue('myvar')); // Searches your current URI and returns myvar if it exists </script>
Download
You can download the script here.
Comment by Omar — October 1, 2007 @ 4:51 pm
First query I’ve seen that demonstrates how to implement the retreived variables.
I couldn’t get
alert(GetQueryValue(’myvar’));
to work for me, so instead I used this for myVar:
var myStr=’\”‘ + top.window.location + ‘\”‘;
Thanks for the script.
Comment by Phil — October 1, 2007 @ 5:23 pm
Hmmm that’s odd. So you called
alert(GetQueryValue(’myvar’));And myvar was a query variable in your current URI?
I will take a look at this later on.