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Adding items to listviews on a4.1 is too slow #1424

stickybun opened this Issue · 4 comments

3 participants


Adding items, and then refreshing a listview a4.1 on an iPhone4/4.3.1 is too slow. Even since commit 0ef9545
This was not the case on a3.

To recreate click 'double list' button on the following links to double a list of 20, and then 40.
a3: takes 113ms, 228ms
a4.1+: takes 1700ms, 6460ms


Ok, I found the source of the slow down. It's due to this little nugget in listview's _itemApply():

    $list.find( "li" ).find( ">img:eq(0), >:first>img:eq(0)" ).addClass( "ui-li-thumb" ).each(function() {
        $( this ).closest( "li" ).addClass( $(this).is( ".ui-li-icon" ) ? "ui-li-has-icon" : "ui-li-has-thumb" );

For every list item, we're traversing the entire list to find all the first images of an li. Not really sure what this is about.


I'll need to find out if this was what was really meant:

    item.children("img:eq(0)").add(item.children(":first > img:eq(0)")).addClass( "ui-li-thumb" ).each(function() {
        item.addClass( $(this).hasClass("ui-li-icon") ? "ui-li-has-icon" : "ui-li-has-thumb" );

Replacing the code in question with the code above, gets things into the ballpark of 1.0a3.

@jblas jblas was assigned

Landed some changes that should make things better:


@jblas jblas closed this

I load data for list using ajax and after call listview('refresh'); ui-li-has-icon class not applied for items with
before this cpommit only first item was rendered without ui-li-has-icon

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