javascript - How to write a nightwatch custom command using jquery -

i have following custom command written in javascript nightwatch.js. how can translate using jquery?

exports.command = function (classid, indexifnotzero) {     this.browser.execute(function (classid, indexifnotzero) {         if (classid.charat(0) == '.') {             classid = classid.substring(1);         }         var items = document.getelementsbyclassname(classid);          if (items.length) {             var item = indexifnotzero ? items[indexifnotzero] : items[0];              if (item) {                 item.click();                 return true;             }         }         return false;          //alert(rxp);     }, [classid, indexifnotzero], function (result) {         console.info(result);     }); }; 

there few things see causing issues.

first, have variable shadowing may cause issues. global export command has 2 variables (classid , indexifnotzero) , internal execute command has same parameter names.

second, custom commands, this variable browser. instead of doing this.browser.execute, need call this.execute.

as complete working code example, here go:

'use strict';  var clickelementbyindex = function(classname, index) {   if (!index) {     index = 0;   }    this.execute(function(selector, i) {     var $item = $(selector + ':eq(' + + ')');     if (!!$item) {       $item.click();       return true;     }     return false;   }, [classname, index], function(result) {     console.info(result);   }); };  exports.command = clickelementbyindex; 

note need jquery available in global scope of app work.