How to call module function on button click in arcgis javascript

Question

I want to call module function on button click in arcgis javascript, example, dojo.connect(dom.byId("btnLocate"), "click", function () { example(); }); function example() { alert("df"); myModule.queryStatesLayer(); } here 'alert' is working but i can't access module function, how to call module function on button click? Please guide me with an example

thejuskambi · Answer

You wont be able to call the module function unless your module is part of global variables.

one solution is you can change the context of the function by using lang.hitch like below

dom.byId("myButton").on("click", lang.hitch(myModule, function(){

this.example();

});

You can pass "this" instead of myModule, if the event initialization and method are in the module.

ChrisSmith7 · Answer

I am sure there is a better answer for this as whenever someone mentions "global vars", you should generally think "no" to avoid collisions and conflicts - however, I have accomplished this via the following:

//instantiate your module
window.objmyModule = new myModule({
     "myParam": paramValue
});

//call a module function after you've instantiated the object
objmyModule.myFunction();