Double tap on mobile safari

问题:

Is there a way to bind to a double-tap event (in a single line of code) for mobile safari? Or, the alternative is to implement it intercepting two single-tap events that happened in some short given time (example: http://appcropolis.com/blog/implementing-doubletap-on-iphones-and-ipads/)?

回答1:

Short answer: you must implement via two clicks.

Actual answer: Here is a jQuery-free implementation of double-tap for mobile safari which only requires one line of code (to enable dblclick event):

• https://gist.github.com/2927073

In addition, you will likely need to disable mobile Safari's default zoom with this meta tag:

<meta name="viewport" content="width=device-width,user-scalable=no" />

回答2:

If you want to have working double click both on browser and IOS platform, you should have the following code:

jQuery.event.special.dblclick = {
    setup: function(data, namespaces) {
        var agent = navigator.userAgent.toLowerCase();
        if (agent.indexOf('iphone') >= 0 || agent.indexOf('ipad') >= 0 || agent.indexOf('ipod') >= 0) {
            var elem = this,
                $elem = jQuery(elem);
            $elem.bind('touchend.dblclick', jQuery.event.special.dblclick.handler);
        } else {
            var elem = this,
                $elem = jQuery(elem);
            $elem.bind('click.dblclick', jQuery.event.special.dblclick.handler);
        }
    },
    teardown: function(namespaces) {
        var agent = navigator.userAgent.toLowerCase();
        if (agent.indexOf('iphone') >= 0 || agent.indexOf('ipad') >= 0 || agent.indexOf('ipod') >= 0) {
            var elem = this,
                $elem = jQuery(elem);
            $elem.unbind('touchend.dblclick');
        } else {
            var elem = this,
                $elem = jQuery(elem);
            $elem.unbind('click.dblclick', jQuery.event.special.dblclick.handler);
        }
    },
    handler: function(event) {
        var elem = event.target,
            $elem = jQuery(elem),
            lastTouch = $elem.data('lastTouch') || 0,
            now = new Date().getTime();
        var delta = now - lastTouch;
        if (delta > 20 && delta < 500) {
            $elem.data('lastTouch', 0);
            $elem.trigger('dblclick');
        } else {
            $elem.data('lastTouch', now);
        }
    }
};

Try it here:

http://jsfiddle.net/UXRF8/

回答3:

Override dblclick event and use bind, live, on, delegate like for any other event:

jQuery.event.special.dblclick = {
    setup: function(data, namespaces) {
        var elem = this,
            $elem = jQuery(elem);
        $elem.bind('touchend.dblclick', jQuery.event.special.dblclick.handler);
    },

    teardown: function(namespaces) {
        var elem = this,
            $elem = jQuery(elem);
        $elem.unbind('touchend.dblclick');
    },

    handler: function(event) {
        var elem = event.target,
            $elem = jQuery(elem),
            lastTouch = $elem.data('lastTouch') || 0,
            now = new Date().getTime();

        var delta = now - lastTouch;
        if(delta > 20 && delta<500){
            $elem.data('lastTouch', 0);
            $elem.trigger('dblclick');
        }else
            $elem.data('lastTouch', now);
    }
};