Javascript selectedIndex is returning undefined on a HTML drop-down menu

Question

Currently I am trying to write a method that appends the value of a dropdown menu to an html link. However I an having trouble retrieving the text of the selection from the menu. I narrowed the problem down to the selectedIndex method in Javascript. It returns undefined. I've included my method below.

function getSize(productID){
    var sizeBox = document.getElementsByName(productID);
    alert(document.getElementsByName(productID).selectedIndex);
    var sizeSelected = sizeBox.options[sizeBox.selectedIndex].text;
    alert(sizeSelected);
    var link = document.getElementById(productID).getAttribute("href");
    link = link + "&size=" + sizeSelected;
    document.getElementById(productID).setAttribute("href",link);
    return true;
}

why not put sample code somewhere like jsfiddle, and yet it is hard to read/understand formatting, do not hesitate about spacing and anything which adds to code more readability) — dmi3y
– dmi3y, Commented Nov 27, 2012 at 22:06
Thanks everyone! Problem solved! I was having problems with the parameter. — BooBailey
– BooBailey, Commented Nov 27, 2012 at 23:08

RobG · Accepted Answer · 2012-11-27 22:47:05Z

4

getElementsByName returns an HTMLCollection. You should say: getElementsByName[0]

edited Nov 27, 2012 at 22:47

RobG

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answered Nov 27, 2012 at 21:42

Matt

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1 Comment

BooBailey Over a year ago

Thanks! I tried the following adjustments: var sizeBox = document.getElementsByName(productID)[0]; and var sizeSelected = sizeBox.options[sizeBox.selectedIndex].text;. Both still return undefined.

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