Javascript Querystring Class Version 1.4

Published 26 August 08 10:58 AM | danieb

The updated version of the original JavaScript Querystring class.

        1: // 

       2: //    ------------------------------------------------------------------------

       3: //    Modified by Danie Bruwer  2008/08/26

       4: //    http://dotnet.org.za/danieb

       5: //    New in Version 1.4

       6: //    * Chainable

       7: //    ------------------------------------------------------------------------

       8: //    Original File :

       9: //    http://adamv.com/dev/javascript/querystring

//    Client-side access to querystring name=value pairs

//      Version 1.3

//       28 May 2008    

//      License (Simplified BSD):

//      http://adamv.com/dev/javascript/qslicense.txt    

  

function $Querystring(qs) {

    return new Querystring(qs);

}

function Querystring(qs) { // optionally pass a querystring to parse

    this.params = {};

    this.keys = new Array();

    this.path = (qs && qs.indexOf('?') > 0) ? qs.split('?')[0] : location.protocol +location.host + location.pathname;

    

    if (qs == null) qs = location.search.substring(1, location.search.length);

    if (qs.length == 0) return;

    if (qs.indexOf('?') > 0)

        qs = qs.split('?')[1];

  

    // Turn <plus> back to <space>

    // See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1

    qs = qs.replace(/\+/g, ' ');

    var args = qs.split('&'); // parse out name/value pairs separated via &

    

    // split out each name=value pair

    for (var i = 0; i < args.length; i++) {

        var pair = args.split('=');

        var name = decodeURIComponent(pair[0]);

        

        var value = (pair.length==2)

            ? decodeURIComponent(pair[1])

            : name;

            

        this.keys = name;

        this.params[name] = value;

    }        

}

  

Querystring.prototype.get = function(key, default_) {

    var value = this.params[key];

    return (value != null) ? value : default_;

}

Querystring.prototype.set = function(key, value) {

    value = encodeURI(value);

    this.params[key] = value;

    var index = this.indexOfKey(key);

    if (index < 0)

        this.keys[this.keys.length] = key;

  

    return this;

}

Querystring.prototype.indexOfKey = function(key) {

    for (var i = 0; i < this.keys.length; i++) 

    {

        if(this.keys == key)

            return i;

    }

    return -1;

}

Querystring.prototype.remove = function(key) {

    var index = this.indexOfKey(key);

    if (index >= 0) {

        this.params[key] = null;

        this.keys.splice(index, 1);

    }

    return this;

}

Querystring.prototype.toString = function() {

    var ret = "";

    for (var i = 0; i < this.keys.length; i++) 

    {

        if(this.keys)

            ret += ((i == 0) ? "?" : "&") + this.keys + "=" + this.params[this.keys];

    }

    return ret;

}

Querystring.prototype.getAbsolutePath = function() {

    return this.path;

}

Querystring.prototype.toAbsoluteUrl = function() {

   return this.path + this.toString();

}

Querystring.prototype.contains = function(key) {

    var value = this.params[key];

    return (value != null);

}

New in Version 1.4. Chainable :

       1: alert($Querystring().set("search", "changed").toString());

       2: alert($Querystring().set("search", "changed").set("page", "1").indexOfKey("page"));

       3: alert($Querystring().set("search", "changed").set("page", "1").set("search", "changed again").toAbsoluteUrl());

       4: alert($Querystring("http://www.test.com?search=searchtext&page=1").set("search", "changed").set("page", "2").toAbsoluteUrl());