如何禁用，启用然后再次禁用使用e.preventDefault（）;在ipad / iphone中滚动？

Question

I have it disabled already, and I can enable it again. I used:

document.ontouchmove = function(e){
             e.preventDefault();
}

In the document.ready(); to disable it.

And I used this to enable it.

function doTouchMove(state) {
    document.ontouchmove = function(e){
      return state;
    }
}

I have it so when a user double clicks on an element, the doTouchMove is called. But how do I make it disabled again?

Thanks

Answer 1

You could create a toggle instead, where your doTouchMove() function switches between false and true every time it's called:

(function () { // Set up a closure so we don't pollute the global scope
    var state = false;
    function doTouchMove() {
        state = !state;
    }
    document.ontouchmove = function(e){
        return state;
    }
    document.getElementById("myDoubleClickElement").ondblclick = doTouchMove;
})();

Now, every time you double-click #myDoubleClickElement , it will toggle the state variable's value between false and true , effectively disabling on the even clicks and enabling on the odd clicks.

Answer 2

Im the same user who asked this question... but I cleared my history & everything so I can't pick an answer or anything!

But what I did to fix it was put this

document.ontouchmove = function(e){
             e.preventDefault();
}

Into its own function, just as the doTouchMove() was. Then when I wanted it to stop moving again i would just call the name of that preventDefault function.

I don't know why it makes a difference but it works! :)