Can't find the array index using .indexOf()

Question

I am writing a program that takes all of the text from a text box, parses it into an array removing white-space, and then will search the array for expected values.

I can test it and get the program to successfully take the text in the text box and parse it into the array, but when I try to find the expected values in the array, it throws an error. The error is, "Object doesn't support this property or method".

JavaScript:

function generateOutputfvoc()
{
    var inputArr = document.getElementById("inputBox").value.split(/[\s]/);
    var nameLoc = inputArr.indexOf("Name");
    document.getElementById("contactNameOutput").innerHTML = nameLoc;
}

HTML snippet:

<p>Paste Text Here</p>
<textarea rows='8' cols='152' id='inputBox' placeholder="Copy text and paste here" wrap="off"></textarea>
<form><input type='button' onclick='generateOutputfvoc()' value='Generate Output' /></form>
<p>Contact Name: <b id='contactNameOutput'></b></p>

Thank you.

What browser is that? The indexOf() method is not supported in Internet Explorer 8 and earlier. — Thilo
– Thilo, Commented Jan 22, 2013 at 13:56
What browser are you testing this in? Array.indexOf() is a fairly recent addition to ECMAScript. — Mattias Buelens
– Mattias Buelens, Commented Jan 22, 2013 at 13:57
I am testing it in IE8. I tried it in FF and it worked. Thank you for the prompt replies. I am concerned because I am going to need this to work with all versions of IE. Any ideas on backwards compatibility? — Mrow
– Mrow, Commented Jan 22, 2013 at 14:04
related thread "How to fix Array indexOf() in JavaScript for IE browsers" - stackoverflow.com/questions/1744310/… — benbai123
– benbai123, Commented Jan 22, 2013 at 14:22

javabeangrinder · Accepted Answer · 2013-01-22 14:01:28Z

3

You can add indexOf() utilizing the prototype feature of javascript according to this page: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/indexOf

answered Jan 22, 2013 at 14:01

javabeangrinder

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1 Comment

Mrow Over a year ago

Thank you. I am using IE8 to test the code, which seems to be the problem. I put the compatibility code into my program and it works! I have a new concern however... I get the correct value when I run the program in IE8 now, but in FF I get a different value when using the same text. Any ideas?

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