--- /dev/null
+
+
+ /**
+ * Set query string parameter value
+ */
+ function setParam(url, paramName, value){
+ url = url || '';
+
+ var re = new RegExp('(\\?|&)'+ paramName +'=[^&]*' );
+ var param = paramName +'='+ encodeURIComponent( value );
+
+ if ( re.test(url) ) {
+ return url.replace(re, '$1'+ param);
+ } else {
+ if (url.indexOf('?') === -1) {
+ url += '?';
+ }
+ if (url.indexOf('=') !== -1) {
+ url += '&';
+ }
+ return url + param;
+ }
+
+ }
+
+ module.exports = setParam;
+
+