How can i get the value of first query string in a URL

Question

Hi im using following code to get the query string value in a form field:

<script>
var url = window.location.search;
url = url.replace("?Id=", ''); // remove the ? 
</script>
<script>document.write("<input name='Id' data-constraints='@Required(groups=[customer])' id='Id' type='text' value='"+url+"' />");</script>

if i visit [this is not a link] (http://mydomain.com/?Id=987) it records the Id in field but when more parameters are included it also records in the field, i want only first or any specific query string parameter to be added in form field?

Did you use any search? stackoverflow.com/questions/979975/… stackoverflow.com/questions/11582512/… — user2824854
– user2824854, Commented Feb 18, 2014 at 3:47
possible duplicate of How can I get query string values in JavaScript? — user2824854
– user2824854, Commented Feb 18, 2014 at 3:47

Dimitar Dimitrov · Accepted Answer · 2014-02-18 04:54:57Z

2

How about building an nice little associative array out of your query string parameters, something like:

var urlParams = [];
window.location.search.replace("?", "").split("&").forEach(function (e, i) {
    var p = e.split("=");
    urlParams[p[0]] = p[1];
});

// We have all the params now -> you can access it by name
console.log(urlParams["Id"]);

edited Feb 18, 2014 at 4:54

answered Feb 18, 2014 at 4:07

Dimitar Dimitrov

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Comments

Sam · Accepted Answer · 2014-02-18 03:50:11Z

0

Basically, you need to check for the existence of an ampersand, the get the sub string up to the ampersand.

You could add this code after you do your replace:

var start = url.indexOf('&');

if(start > 0) {
    url = url.substring(0, start);
}

answered Feb 18, 2014 at 3:50

Sam

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