Making a table using Javascript

Question

I am having this issue where the table is not being displayed with my Javascript. It is suppose to work to where once the user enters the 10 numbers in the window.prompt the numbers would be put into an array and displayed into a table.

Here is the code:

<html>
<head>
<meta charset = "utf-8">
<script type = "text/javascript">

var number = -99;
var array1 = new Array(10);

number = window.prompt("Enter 1 to continue \n Enter -99 to exit");
if(number == -99 || number == ""){
    exit();
}else
    array1 = window.prompt("Please enter 10 numbers to be stored into an array");

    function outputArray(heading, theArray, output){
    var content = "<h2>" + heading + "</h2><table><thead><th>Index</th><th>Value</th></thead><tbody>";
    var length = theArray.length;
    for(var i=0; i<length;++i){
    content += "<tr><td>" + i + "</td><td>" + theArray[i] + "</td></tr>";
    }
    content += "</tbody></table>";
    output.innerHTML = content;
    }

    outputArray("Your Array is:", array1, document.getElementById("output"));
</script>
</head>
<body>
<div id="output"></div>
</body>
</html>

Krasimir · Accepted Answer · 2013-09-21 20:09:20Z

1

You should wrap your script in a onload handler:

var onLoadHandler = function() {
    var number = -99;
    var array1 = new Array(10);

    number = window.prompt("Enter 1 to continue \n Enter -99 to exit");
    if(number == -99 || number == ""){
        exit();
    }else
        array1 = window.prompt("Please enter 10 numbers to be stored into an array");

        function outputArray(heading, theArray, output){
            var content = "<h2>" + heading + "</h2><table><thead><th>Index</th><th>Value</th></thead><tbody>";
            var length = theArray.length;
            for(var i=0; i<length;++i){
            content += "<tr><td>" + i + "</td><td>" + theArray[i] + "</td></tr>";
            }
            content += "</tbody></table>";
            output.innerHTML = content;
        }

        outputArray("Your Array is:", array1, document.getElementById("output"));
}
if (window.addEventListener) {
    window.addEventListener('load', onLoadHandler, false);
} else if (window.attachEvent) {
    window.attachEvent('onload', onLoadHandler );
}

I.e. you are trying to manipulate a DOM element, which may be still not there.

answered Sep 21, 2013 at 20:09

Krasimir

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1 Comment

Shawn Over a year ago

That works perfect. I need to do some research on these window.addEventListener and attachevent. Any recommendations for a good tutorial? And Thank you very much.

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