What could be the reason behind the disruption in this JavaScript associative array?

I'm facing an issue with my associative array, which I have confirmed through console.log to be initially:

this.RegionsChecked = {"US":true,"APAC":true,"Canada":true,"France":true,"Germany":true,"India":true,"Japan":true,"LATAM":true,"MEA":true,"UK":true,"WE":true};

In my event handler, I am trying to toggle the value of a corresponding item when it is checked/unchecked in the HTML:

Calculator.prototype.UpdateGraphs = function ( $elem ) 
{
    // $elem : input[type="checkbox"] element that was clicked, as a jQuery object

    var $parent = $elem.parent(); // Parent of input that was clicked. 
                                  // Will either be a th.region or a td#guiderow-[metric_name]

    if ( $parent.hasClass('region') ) 
    {
        var region_name = $parent.text();
        this.RegionsChecked[region_name] = !this.RegionsChecked[region_name]; // toggle region name
        console.log(JSON.stringify(this.RegionsChecked)); // TEST
    }
    // ... 

It's strange that sometimes, when I change the check value of Canada, for example, the array ends up like:

this.RegionsChecked = {"US":true,"APAC":true,"Canada":true,"France":true,"Germany":true,"India":true,"Japan":true,"LATAM":true,"MEA":true,"UK":true,"WE":true,"\n\t\t\t\t\tCanada":true};

(notice the duplicate "Canada" key)

instead of the expected result:

this.RegionsChecked = {"US":true,"APAC":true,"Canada":false,"France":true,"Germany":true,"India":true,"Japan":true,"LATAM":true,"MEA":true,"UK":true,"WE":true};

which does happen sometimes, I believe (but I need to confirm). I'm still investigating why this inconsistency occurs. Any ideas on what could be causing this?

EDIT: Strange... It just worked properly. I can't seem to identify a pattern in when it works and when it doesn't. I'm using Microsoft Sharepoint Designer, which can behave strangely...

Answer №1

It is generally not recommended to rely on the actual content of a DOM node as a key for information, especially if the DOM is dynamically generated by a complex CMS like SharePoint that applies various text transforms before rendering. This is where mechanisms such as data attributes come in handy.

However, if you must use the text as a key, it's advisable to trim the text beforehand. For example:

var region_name = $.trim($parent.text());

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