User:TheFearow/qstring.js

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/**
* Maps the querystring to an object
*
* Functions:
*
* QueryString.exists(key)
*     returns true if the particular key is set
* QueryString.get(key)
*     returns the value associated to the key
* QueryString.equals(key, value)
*     returns true if the value associated with given key equals given value
* QueryString.toString()
*     returns the query string as a string
* QueryString.create( hash )
*     creates an querystring and encodes strings via encodeURIComponent and joins arrays with | 
*
* In static context, the value of location.search.substring(1), else the value given to the constructor is going to be used. The mapped hash is saved in the object.
*
* Example:
*
* var value = QueryString.get('key');
* var obj = new QueryString('foo=bar&baz=quux');
* value = obj.get('foo');
*/
function QueryString(qString) {
 this.string = qString;
 this.params = {};

 if( qString.length == 0 ) {
 return;
 }

 qString.replace(/\+/, ' ');
 var args = qString.split('&');

 for( var i in args ) {
 if( typeof( args[i] ) != 'string' ) {
 continue;
 }
 var pair = args[i].split( '=' );
 var key = decodeURIComponent( pair[0] ), value = key;

 if( pair.length == 2 ) {
 value = decodeURIComponent( pair[1] );
 }

 this.params[key] = value;
 }
}

QueryString.static = null;

QueryString.staticInit = function() {
 if( QueryString.static == null ) {
 QueryString.static = new QueryString(location.search.substring(1));
 }
}

QueryString.get = function(key) {
 QueryString.staticInit();
 return QueryString.static.get(key);
};

QueryString.prototype.get = function(key) {
 return this.params[key] ? this.params[key] : null;
};

QueryString.exists = function(key) {
 QueryString.staticInit();
 return QueryString.static.exists(key);
}

QueryString.prototype.exists = function(key) {
 return this.params[key] ? true : false;
}

QueryString.equals = function(key, value) {
 QueryString.staticInit();
 return QueryString.static.equals(key, value);
}

QueryString.prototype.equals = function(key, value) {
 return this.params[key] == value ? true : false;
}

QueryString.toString = function() {
 QueryString.staticInit();
 return QueryString.static.toString();
}

QueryString.prototype.toString = function() {
 return this.string ? this.string : null;
}


QueryString.create = function( arr ) {
 var resarr = Array();
 for( var i in arr ) {
 if( typeof arr[i] == 'object' ){
 var v =  Array();
 for(var j in arr[i] ) {
 v[j] = encodeURIComponent( arr[i][j] );
 }
 resarr.push( encodeURIComponent( i ) + '=' +  v.join('|')  );
 } else {
 resarr.push( encodeURIComponent( i ) + '=' + encodeURIComponent( arr[i] ) );
 }
 }

 return resarr.join('&');
}
QueryString.prototype.create = QueryString.create;