通过javascript禁用和启用箭头键 [英] Disable and Enable Arrowkeys by javascript

问题描述

我有一个场景，首先我需要禁用键盘箭头键，然后再进行一些处理启用它，为此我写了这个jquery函数

I have a scenario where first I need to disable keyboard arrow keys and after some processing again Enable it,for this I write this jquery function

function DisableArrowKeys() {
        var ar = new Array(37, 38, 39, 40);
        $(document).keydown(function(e) {
            var key = e.which;
            if ($.inArray(key, ar) > -1) {
                e.preventDefault();
                return false; 
           }
            return true;
        });
    }

此功能可以禁用箭头键，经过一些处理我需要启用箭头键为此我在下面的函数中进行了更改

this function can disable arrow keys,after some processing I need to enable arrow key for this I made changes in the function like below

function EnableArrowKeys() {
        var ar = new Array(37, 38, 39, 40);
        $(document).keydown(function(e) {
            var key = e.which;
            if ($.inArray(key, ar) > -1) {              
                return true;
            }           
        });
    }

但是当我们调用该函数时，它不会启用箭头键。

But when we call that function it does not enable arrowkeys.

推荐答案

您需要保留对禁用功能的引用，并在准备好再次接受箭头键时取消绑定。类似于：

You need to keep a reference to your disabling function, and unbind it when you are ready to accept arrow keys once more. Something like:

var ar = new Array(37, 38, 39, 40);
var disableArrowKeys = function(e) {
    if ($.inArray(e.keyCode, ar)>=0) {
        e.preventDefault();
    }
}

$(document).keydown(disableArrowKeys);

// then when you are ready to enable, unbind the function...
$(document).unbind('keydown', disableArrowKeys);

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