javascript - prevent touchstart when swiping

Question

I have a scrollable list on a mobile device. They want people to be able to scroll the list via swiping, and also select a row by tapping.

The catch is combining the two. I don't want a row to be selected if you are actually scrolling the list. Here's what I've found:

Doesn't trigger when scrolling:

• click
• mouseup

Does trigger when scrolling:

• mousedown
• touchstart
• touchend

The simple solution is to just stick with the click event. But what we're finding is that on certain blackberry devices, there is a VERY noticeable lag between touchstart and it then triggering either click or mouseup. This delay is significant enough to make it unusable on those devices.

So that leaves us with the other options. However, with those options, you can scroll the list without triggering the row you touched to start the scroll.

What is the best practice here to resolve this?

Answer 1

var touchmoved;
$('button').on('touchend', function(e){
    if(touchmoved != true){
        // button click action
    }
}).on('touchmove', function(e){
    touchmoved = true;
}).on('touchstart', function(){
    touchmoved = false;
});