Adjusting background position using incremental changes through JavaScript

Although I have a strong background in PHP coding, using javascript is a new venture for me so I hope this question doesn't sound naive.

My objective is to create a button that, when clicked, shifts the background-position of a specified DIV object by one pixel.

Despite scouring Google and various websites for guidance, I have been struggling to find a suitable javascript function that achieves my desired outcome.

The current version of my script looks like this:

<SCRIPT TYPE="text/javascript">
var xObject = 0; // Global

function xMinus(ele) {
    xObject-=1;
    document.getElementById(ele).css({ 'backgroundPosition': xObject + 'px ' + 0 + 'px' });
}
</SCRIPT>

My intention is for the background to shift left by one pixel upon clicking the button with onclick="javascript:xMinus('divID');". However, when clicked, the Error Console displays "Error: document.getElementById(ele).css is not a function".

Despite attempting alternative approaches, I continue to encounter similar outcomes or "Variable is not defined" errors. It's clear that I am feeling lost in this process. Any assistance would be greatly appreciated as I'm working on this project for friends and don't want to keep them waiting too long.

Answer №1

In case you are not utilizing jQuery,

document.getElementById(element).style.backgroundPosition = positionObject + 'px ' +'0px';

Answer №2

What should be passed inside the ele? It needs to be a string representing the id of the element and must not begin with a number.

Consider refactoring the code as follows:

let xValue = 0; // Global

function decreaseX(ele) {
    xValue--;
    $('#'+ele).css({ 'backgroundPosition': xValue + 'px ' + 0 + 'px' });
}

Assuming you are using jQuery! :) If not, the equivalent would be:

document.getElementById(ele).style.backgroundPosition = xValue + 'px ' + '0';

Regarding the handler for the anchor tag, it should look something like this (avoid including javascript:):

<a href="#" onclick="decreaseX('id'); return false;">Move Background Left!</a>

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