How to call a JavaScript function that is inside a "define" - anonymous method

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How to call a function which is defined inside an anonymous function but both in the same JS file. Here is my code snippet. How to call _testMethodInside() from testMethodOutside()?

// Line 1 to 13 is an existing code from ESRI API
    define([
        "dojo/_base/declare",
        "dojo/_base/html"
    ], function (
        declare,
        html
    ) {
        return declare([_WidgetBase, _TemplatedMixin], {
            _testMethodInside: function () {
                return 'success';
            }
        });
    });

//Call above using this function
    function testMethodOutside(){
        //How to call _testMethodInside() function from here
    }

Follow the Dojo documentation. The define block defines a module. You did not specify the module id (which would either be passed explicitly or inferred from the file name), so I will proceed as if the module is named my/Example.

require(['my/Example'], function(Example) {
   var example = new Example();
   example._testMethodInside(); // here is where you call _testMethodInside
}

The key thing is that because the module is loaded asynchronously, the only place you can safely call it from is the callback function you pass into (AMD) require.

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With esri's Web app builder you'd usually either :

1) Have all your code inside the define/require 2) Separate it into two modules

That's just how the design of the flow is supposed to go, for example :

file1.js :

define([
    "dojo/_base/declare",
    "dojo/_base/html"
], function (
    declare,
    html
) {
    return declare([_WidgetBase, _TemplatedMixin], {
        _testMethodInside: function () {
            return 'success';
        }
    });
});

file2.js :

  require([
        './file1'
  ], function (File1) {

      File1._testMethodInside();
  })

Also, method names starting with an underline is a common design choice to designate private methods, so _testMethodInside should only really be called by file1

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If it should be just a common function for the _testMethodInside method and testMethodOutside function, consider the following:

function sharedFunction() {
    return 'success';
}

function testMethodOutside() {
    sharedFunction();
}

define([
    "dojo/_base/declare",
    "dojo/_base/html"
], function (declare, html) {
    return declare([_WidgetBase, _TemplatedMixin], {
        _testMethodInside: sharedFunction
    });
});

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Different ways of invoking JavaScript functions · Ashish Dasnurkar, JavaScript | Nested functions. Write one function inside another function. Make a call to the inner function in the return statement of the outer function. Call it fun(a)(b) where a is parameter to outer and b is to the inner function. Finally return the combined output from the nested function. Function within a function. How do you define a function within a function in JavaScript? Pretty simple and straight forward actually. Just throw another function into the function. This will caused the inner function to be accessible only within the scope of outer function.

4 ways to call a function in JavaScript, JavaScript tutorial 82 - Calling a function inside another function in javascript Calling a Duration: 11:39 Posted: Sep 13, 2017 function innerF (x) {. return 4 * x. } alert (innerF (4)) // alerts 16. return 3 * innerF (x) } alert (outerF (5)) // alerts 60. alert (innerF (4)) // throws an exception. You can see this in action (the error is not canceled) by clicking on this sample link.

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Comments
  • why do you want to achieve such a thing ?
  • @BooBerr'ita, Line 1 to 13 is an existing code from ESRI API. I want to call that method using my testMethodOutside()
  • This is called AMD format and a popular way to define modules. You can use them with require, and you should have a module loader library in place that declares define and require.