Problem with pixel alignment due to decimal placement

Recently, a helpful member of the StackOverflow community provided me with some jQuery-based Javascript code.

The code works well overall, but there is a persistent issue that I need assistance with.

Specifically, the JavaScript calculates a margin for alignment purposes. However, the calculated value is not always an exact pixel - sometimes it's 14.4 or similar. Oddly enough, this issue only occurs in browsers like Safari and Chrome where, as the screen is resized, the box on the far right side 'jumps' instead of staying flush against the edge of the container.

In Firefox, however, this problem does not occur, which is the desired behavior I am aiming for.

Is there any way to prevent this disruptive 'jumping' effect, or is it unfortunately related to how different browsers render content, beyond my control? :(

You can find the code and demo in this JSFiddle link: http://jsfiddle.net/m4Gp/1/

(Try resizing the browser width in Firefox then in Safari/Chrome to observe the jump on the right)

Any responses are immensely appreciated! Thank you very much

Answer №1

The reason for this behavior is due to the rendering engine itself. Pixels do not have decimals, 1px being the smallest addressable screen element. Therefore, before adjusting the margin, incorporate Math.round

 $(".barModules li").css('margin-left', Math.round(dynMargin) + "px"); 

However, the bouncing effect occurs because the element is positioned in a manner where it is anchored to the left side (reference). When it encounters the property margin-right:0, it also attempts to activate that attribute ... resulting in a bounce due to its existing margin-left and positioning based on the left side. It's akin to a debounced function call.

If you intend to utilize a dynamic margin, you will need to make adjustments accordingly. Alternatively, opt for a fixed-width page with centered elements to avoid overflow concerns.

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