IE11's handling of array values is causing processing issues

I am encountering an issue with a JavaScript array specifically in IE11, particularly within the for loop.

Below is the code snippet:

    function onResponseReceived(responseArray) {
      found = true;
      var i;

      for(i in responseArray) {
        var item = responseArray[i];
        if (item.field_number == '5') {
            item.value = intlToUsDate(item.value);
            console.log(item.value);
        }

        var inputSelector = '[name="input_' + item.field_number + '"]';
        var dom_elms = document.querySelectorAll(inputSelector);

        for (var e in dom_elms) {
            var dom_elm = dom_elms[e];
            if (dom_elm.type == 'radio' || dom_elm.type == 'checkbox') {
                if (dom_elm.value == item.value && !dom_elm.checked) {
                    dom_elm.click();
                    continue;
                }
            } else {
                dom_elm.value = item.value;
            }

        }
    }
}

When viewing the output in IE11 using the console.log, it displays:

"
i
d
"
:

"
1
8
4
1
"
,

Comparatively, here is the output for the same JavaScript code in Chrome:

field_number
:
"5"
form_id
:
"10"
id
:
"1839"
is_synced
:
"1"
lead_id
:
"2967"
value
:
"05/08/2018"
__proto__
:
Object

It seems to process the information correctly on Chrome.

In IE11, how can I ensure that the array behaves like an object as observed in Chrome, Firefox, or Edge?

Thank you, Kevin

Answer №1

querySelectorAll does not return an array; instead, it returns a NodeList. The documentation for this method explicitly states:

Avoid using for...in or for each...in to iterate through the NodeList, as this will include properties like length and item which may cause issues if your script expects only element objects.

Instead of the following code snippet:

for (var i in elements) {
  var element = elements[i];
  :
}

You should opt for the following approach, especially for compatibility with Internet Explorer:

Array.prototype.forEach.call(elements, function(element) {
  :       
});

Answer №2

After some research, I came across the solution. It required me to include this snippet of code:

    let parsedResponse = JSON.parse(responseArray);

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