backgroundPositionX not working on Firefox

问题:

I have play with youtube's sprite animation but there is a problem. backgroundPositionX won't work under Firefox (but works on Chrome and IE8)... This is the code: https://jsfiddle.net/74RZb/

Extra info: the problem is that under firefox It doesn't change the background position (won't play the animation)... there are no errors, just doesn't change the background position.

回答1:

Firefox doesn't support backgroundPositionX, but it does support background position

So we can do something like this:

psy.style.backgroundPosition = x+'px 0';

This sets the background position, X first, then Y.

Working example here

回答2:

This works in IE, FF and chrome:

background-position: 0 center;

回答3:

This worked for me. NX is number of pixels in axis X and NY in axis Y.

background-position: calc(NXpx) NYpx;

回答4:

Using like this:

background-position: calc(100% - 20px) center; // working on chrome and ff
background-position-x: calc(100% - 20px); // working on ie

回答5:

Background position-x can work in firefox you just have to specify a fixed background-y position. Here is a function I wrote to move a ribbon from left to right. At first it did not work when there was just a position-x specification, well it worked in IE but not FF. This was my solution. It is the actual code with comments from my site that works in both IE and FF:

   //starts ribbon motion at bottom of animation div 
    function startMotion() {
        var ribbonMove = setInterval(function () { ribbonMotion() }, 50);
        var x = 0;
        var cycles = 0;

        function ribbonMotion() {
            //background position moves on the x plane and is fixed at 0 on the y plane (single plane specification does not work in FF)
            document.getElementById("ribbon").style.backgroundPosition = x + "px" + " " + 0 + "px";
            x++;
            if (x == 800 || x==1600 || x==2400 ||x==3200) {
                cycles++;

              //sets number of cycles before motion stops (max 4 cycles)  
            }
            if (cycles == 3) {
                clearInterval(ribbonMove);
            }
        }
    }  

回答6:

You can do something like this

First install jquery migration

https://github.com/jquery/jquery-migrate/#readme

Include these on your html

The $.browser property allows you to target browsers you want to apply your style into

In this case for background-position can be changed to property supported backgroundPosition

Available flags are - webkit - safari - opera - msie (for IE) - mozilla

Example for IE or Firefox

if ( $.browser.msie || $.browser.mozilla) {
        $(".element").css('backgroundPosition', position + "px 0");                
}

for chrome

if ( $.browser.webkit) {
        $(".element").css('backgroundPosition', position + "px 0");                
}

I got mine working and for all IE

Cheers