Problem encountered with the JavaScript for loop failing to execute consistently on each iteration

Currently, I am working on a JavaScript code that alerts the count in an array of pages.

The variable urls represents an array of page names, while count contains the count value.

My goal is to alert the count value for each page in the urls array.

However, I'm facing an issue with the for loop not executing every time. I'm unsure why this is happening... Can someone please assist me in identifying the mistake?

I have been using echo $_POST['suggest']; within the array of pages. However, I would like to receive and alert the 'suggest' value using JavaScript instead. How can I achieve this through JavaScript?

<script>
$(document).ready(function () {
    var count = document.getElementById('display_visitor_number').innerHTML; //count
    var urls = document.getElementById('display_visitor_urls').innerHTML; //array of page names
    var myarr = urls.split(",");

    for (var i=1;i<myarr.length;i++)
    { 
        $.post(myarr[i],{suggest:count}, function(data) {
            alert(data);
        });
    }
});
</script>

Answer №1

Before splitting a string, it is important to check if it starts with a comma to avoid having an empty string as the first value. This can trigger jQuery to make an unnecessary ajax call to the current page. Make sure to handle this by checking for an empty string and starting with index 0 if needed.

<script>
        $(document).ready(function () {
            var count = document.getElementById('display_visitor_number').innerHTML; //count
            var urls = document.getElementById('display_visitor_urls').innerHTML; //array of page names
            var myarr = urls.split(",");

            for (var i=0;i<myarr.length;i++)
            { 
                if(myarr[i] !== '')$.post(myarr[i],{suggest:count}, function(data) {
                    alert(data);
                });
            }
        });
    </script>

Answer №2

Instead of utilizing the split function, consider using RegExp to match all sequences of non-space characters. Replace it with:

var myarr = urls.match(/[^ ,]+/g)

Also, make sure to initiate your for loop with var i=0.

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