Puppy Puppy - 2 months ago 26
iOS Question

Safari not firing touch events

I've got a small jsfiddle - http://jsfiddle.net/qhguktsn/5/. When you tap the text at the top of the link (iOS mobile Safari), you get only the mouse events- no touch events at all, not even on the body. If you tap it on the bottom of the text, you get touch events. We depend on touch events for handling 300ms delay.

How can we get touch events for tapping on the top of the text as well as the bottom?

HTML:

<div style="margin-left:200px;margin-top:200px">
<a style="vertical-align:center;height: 20px, width: 20px;font-size:100px" href="javascript: void 0">text</a>
</div>


JS:

jQuery("a").on("mousedown", function() { document.body.appendChild(document.createTextNode("mousedown ")); });
jQuery("a").on("mouseup", function() { document.body.appendChild(document.createTextNode("mouseup ")); });
jQuery("a").on("touchstart", function() { document.body.appendChild(document.createTextNode("touchstart ")); });
jQuery("a").on("touchend", function() { document.body.appendChild(document.createTextNode("touchend ")); });
jQuery("a").on("click", function() { document.body.appendChild(document.createTextNode("click ")); });

jQuery(document.body).on("touchstart", function() { document.body.appendChild(document.createTextNode("body touchstart ")); });
jQuery(document.body).on("touchend", function() { document.body.appendChild(document.createTextNode("body touchend ")); });

Answer

The touch events on the body are due to the body element being shifted down by the margin-top, putting an outline on the body element outlines the touch-target:

body { outline: 1px solid red; }

http://jsfiddle.net/qhguktsn/11/

The second part of the mystery seems to be that the click target expands outside the touch-target:

screenshot of text

Touching the red outline will not trigger a touch event on the body element, but the click event seems to fire when tapped anywhere within the grey -webkit-tap-highlight-color region which expands outside the anchor itself. Taps at the very top will therefore trigger click events on the anchor, but not touch events on the body.