The variable 'document.prodimage' does not exist or is not a valid object

Encountering a JavaScript error in IE8 on Windows 7 when loading the page: document.prodimage is null or not an object.

I have excluded my custom dynamic code responsible for API calls to fetch data, which populates elements such as images & links based on the user's product selection. However, this does not seem to be the cause of the issue. Here's the snippet:

<a rel="position:'inside',showTitle:false,adjustX:-4,adjustY:-4" href="">
    <img border="0" class="prodimage" id="prodimage" src="" width="200" height="200" alt="" onMouseover="document.prodimage.src='';" style="margin-right:auto;margin-left:auto;display:block;"/>
</a>
javascriptjqueryhtmlcss

Answer №1

When accessing properties created on the window object for elements with id values, you may have intended to use window.prodimage.

While this method works in most modern browsers and is considered specified behavior, it's more common to use getElementById for clarity. I'm not advocating for the use of automatic globals, just clarifying what you might have been thinking when using document.

In your scenario, particularly since you're utilizing an onXYZ event handler, simply refer to this:

<a rel="position:'inside',showTitle:false,adjustX:-4,adjustY:-4" href="">
    <img border="0" class="prodimage" id="prodimage" src="" width="200" height="200" alt="" onMouseover="this.src='';" style="margin-right:auto;margin-left:auto;display:block;"/>
    <!-- Change is here ---------------------------------------------------------------------------------^^^^        -->
</a>

The purpose behind clearing the src attribute on mouse over may not be clear, but...

Answer №2

Understanding the workings of the DOM is crucial.

To access the element, use 

document.getElementById('prodimage');

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