Why does this function properly on every browser except for Opera?

I have implemented a script that allows me to replace the standard file upload input with a custom image. The script also ensures that an invisible 'browse' button appears underneath the mouse pointer whenever it hovers over the custom image. This functionality works well in ie7, ie8, ie9, Firefox, Safari, and Chrome, but unfortunately, it does not work in Opera. In Opera, the regular file input is displayed instead.

While I am aware that there are numerous scripts available that offer similar features, many of them are too complex for me to understand (such as uploadify) or they do not achieve the desired outcome perfectly - like resizing the custom image to match the size of the file input (which has its own issues).

You can find the script I am using here. It is relatively simple.

I am curious as to why this script does not function correctly in Opera. Is there a way to fix this issue? Despite this limitation, the script meets my needs perfectly except for the Opera compatibility problem.

javascripthtmlcssfile-uploadopera

Answer №1

Interesting case discovered, highlighting an unexpected Opera layout bug: when a file input with opacity set to 0 is shifted outside of its parent container, the input becomes visible. I will be sure to report this issue as a bug and monitor any updates.

To address this problem and ensure the script functions correctly, consider these steps:

  1. Begin by removing or modifying the Opera detection that disables the script. Look for:

    if (window.opera ||

    and eliminate window.opera ||.

  2. Implement a small workaround to adjust the positioning of the file input element to prevent it from being too far left, where the text area portion is hidden and opacity settings are disregarded. Prior to:

    this.file.style.left = x - (w - 30) + 'px';

    Add this line:

    if(window.opera && parseFloat(opera.version())>11.50 && (x-(w-30)<0))w=w/2;

This solution targets only Opera browsers, specifically versions 11.50 and above. Older versions of Opera may not display the file dialog correctly if the "text input" area is clicked. In versions prior to 11.50, you may encounter visual glitches, but the functionality should still operate.

This workaround aims to assist in navigating the bug. However, its sustainability over time remains uncertain. Changes to the file input behavior could occur in future updates.

Answer №2

After experimenting with the SI.Files and example you provided, I delved into why it may not be functioning optimally in Opera. Here are my findings:

  • The condition if (window.opera ||... is causing the functionality to be blocked completely. Removing this...
  • Results in a dynamic image of the previously hidden button overlapping the intended image.
  • Deleting the function 
    elem.parentNode.onmousemove = function(e) {...}
    entirely removes the button display, but also eliminates the cursor in Chrome, ... while in Opera, the cursor changes to that of an input field.
  • Clicking on the "button" triggers the download dialog function.

You may want to explore responses to the question "Styling an input type=“file” button" for alternative solutions:

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