jquery - Increment attribute by set value

Question

I have a jQuery function that has been running well until recently.

//Calculate width of slider container
var calc_width = 200 * $('.side_list_cont').length;
$("#op_slide").width(calc_width);


//Calculation for when to decrease margin for slide effect
$('#op_right').click(function(){
    var slidewidth = parseInt($('#op_slide').css('width'),10),
        getslideleft = parseInt($('#op_slide').css('margin-left'),10),
        slideleft = ((getslideleft - 200)*-1);
    if ( slideleft >= slidewidth ) {
    }
    else {
        $('#op_slide').animate({'margin-left': '-=200px'}, 200);
    }
});


//Calculation for when to increase margin for slide effect
$('#op_left').click(function(){
    var slidewidth = $('#op_slide').css('width'),
        slideleft = $('#op_slide').css('margin-left');
    if (slideleft == '0px') {
    }
    else {
        $('#op_slide').animate({'margin-left': '+=200px'}, 200);
    } 
});

I used to work great. Then all of a sudden, it's not incrementing the margin-left value, but just changing it to either 200px or -200px. When looking at jQuery's docs on .animate, their example on this increment method works as it should.

j08691 · Accepted Answer · 2013-05-31 02:59:51Z

4

Did you recently upgrade to jQuery 1.10.0? If so, the relative incremental animation issue (e.g. .animate({'margin-left': '+=200px'}) was a bug in that version that was just fixed today in 1.10.1.

See: http://blog.jquery.com/2013/05/30/jquery-1-10-1-and-2-0-2-released/ and http://bugs.jquery.com/ticket/13939

answered May 31, 2013 at 2:59

j08691

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1 Comment

Plummer Over a year ago

Yeah, I'm linked to latest. It's an old Joomla build that uses a module. ...ugh.

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