Javascript - understanding variable scope

Hey there! I have some code that I need help with

var idx = 0;
var size = 0;
do {
    response.push({
        key: "data" + idx,
        ajaxOptions: function () {
            var data = this.getPref("groupsCN");
            var items = data.split(';');
            size = items.length;
            idx++;
            alert('inside index: ' + idx + ' < inside length ' + size);
            return {
                url: '/rest/adrestresource/1.0/activedirectory/findgroups&<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2652435552664a4744084a4945474a">[email protected]</a>&Bezhesla1&localhost&',
                type: "GET",
                dataType: "xml"
            }
        }
    });
    alert('outside index: ' + idx + ' < outside length ' + size);
} while (idx < size);

The purpose of the getPref function is to load a string containing values separated by semicolons. The goal is to iterate through these values and perform certain actions on them. However, the current output of the code is

outside index: 0 < outside length: 0

This indicates that the variables idx and size are not being modified within the function. I'm puzzled as to why this is happening.

I have to include this.getPref() within ajaxOptions -> function, as it does not function correctly when placed outside of it (unfortunately, this function is part of the Atlassian gadget JavaScript framework)

Answer №1

You are not actually executing a function here; instead, you are assigning an anonymous function to the property ajaxOptions within an object literal. If you want to execute a function, you can do so by following this example:

var counter = 0;
var total = 0;
do {
    response.push({
        key: "data" + counter,
        ajaxOptions: (function () {
            var data = this.getPref("groupsCN");
            var items = data.split(';');
            total = items.length;
            counter++;
            alert('inside index: ' + counter + ' < inside length ' + total);
            return {
                url: '/rest/adrestresource/1.0/activedirectory/findgroups&<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5521302621153934377b393a363439">[email protected]</a>&Bezhesla1&localhost&',
                type: "GET",
                dataType: "xml"
            }
        })()
    });
    alert('outside index: ' + counter + ' < outside length ' + total);
} while (counter < total);

Answer №2

Here is a different approach:

let index = 0; let length = 0; let obj = this;

also,

let information = function () { return obj.getDetails("categoriesID"); };

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