Javascript 只允许数字和 ctrl+a 、 ctrl+v 、 ctrl+c 到文本框

Allow only numbers and ctrl+a , ctrl+v , ctrl+c to a textbox

提问by Suresh Pattu

I am trying to allow users enter only numbers and copy and paste control to the textbox. I am able to restrict user to enter only numbers but copy,paste is not working for me help me to fix this.

Here is my script:

我试图让用户只输入数字并将控制复制和粘贴到文本框。我可以限制用户只输入数字，但复制、粘贴对我不起作用帮助我解决这个问题。

这是我的脚本：

$(".allow_only_numbers").keydown(function (e) {
    var ctrlDown = false;
    var ctrlKey = 17, vKey = 86, cKey = 67;
    if (e.keyCode === ctrlKey){
        ctrlDown = true;
    }
    // Allow: backspace, delete, tab, escape, enter and .
    if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 110]) !== -1 ||
            // Allow: Ctrl
        (e.keyCode === ctrlKey) ||
            // Allow: Ctrl+A
        (e.keyCode === 65 && e.ctrlKey === true) ||
            // Allow: Ctrl+v
        (e.keyCode === vKey && ctrlDown) ||
            // Allow: Ctrl+c
        (e.keyCode === cKey && ctrlDown) ||
            // Allow: home, end, left, right, down, up
        (e.keyCode >= 35 && e.keyCode <= 40)) {
        // let it happen, don't do anything
        return;
    }
    // Ensure that it is a number and stop the keypress
    if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
        e.preventDefault();
    }
});

Here is the jsfiddle link:

https://jsfiddle.net/sureshpattu/stwzhceL/1/

这是 jsfiddle 链接：https://jsfiddle.net/sureshpattu/stwzhceL/1/

回答by John R

Try with event.keyCodeand event.metaKeylike this.

尝试event.keyCode并event.metaKey喜欢这个。

$(document).ready(function() {
  $(".allow_only_numbers").keydown(function(e) {
    // Allow: backspace, delete, tab, escape, enter and .
    if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 110, 190]) !== -1 ||
      // Allow: Ctrl+A,Ctrl+C,Ctrl+V, Command+A
      ((e.keyCode == 65 || e.keyCode == 86 || e.keyCode == 67) && (e.ctrlKey === true || e.metaKey === true)) ||
      // Allow: home, end, left, right, down, up
      (e.keyCode >= 35 && e.keyCode <= 40)) {
      // let it happen, don't do anything
      return;
    }
    // Ensure that it is a number and stop the keypress
    if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
      e.preventDefault();
    }
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<input type="number" class="allow_only_numbers" />

EDIT:

编辑：

Remove the following code snippets from your code.

从您的代码中删除以下代码片段。

var ctrlDown = false;
var ctrlKey = 17, vKey = 86, cKey = 67;
if (e.keyCode === ctrlKey) {
    ctrlDown = true;
}

Because ctrlDownwill be falsewhile pressing Cand Vfor copy and paste. And hence your ctr+cand ctrl+vis not working.

由于ctrlDown将false同时按下C并V用于复制和粘贴。因此，您的ctr+c和ctrl+v不起作用。

回答by Shanimal

$(".allow_only_numbers").on("input",function (e) {
  e.target.value = e.target.value.replace(/[^0-9]/g,'')
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" class="allow_only_numbers" />

回答by suish

$(".allow_only_numbers").keydown(function (e) {
        var isModifierkeyPressed = (e.metaKey || e.ctrlKey || e.shiftKey);
        var isCursorMoveOrDeleteAction = ([46,8,37,38,39,40].indexOf(e.keyCode) != -1);
        var isNumKeyPressed = (e.keyCode >= 48 && e.keyCode <= 58) || (e.keyCode >=96 && e.keyCode <= 105);
        var vKey = 86, cKey = 67,aKey = 65;
        switch(true){
            case isCursorMoveOrDeleteAction:
            case isModifierkeyPressed == false && isNumKeyPressed:
            case (e.metaKey || e.ctrlKey) && ([vKey,cKey,aKey].indexOf(e.keyCode) != -1):
                break;
            default:
                e.preventDefault();
        }
});

here is working example

这是工作示例

https://jsfiddle.net/stwzhceL/8/

https://jsfiddle.net/stwzhceL/8/

this allow you ctrl+a,ctrl+cand ctrl+vas well as arrow keys,delete key and backspace key.

这允许您ctrl+a，ctrl+c并且ctrl+v还有方向键，删除键和退格键。

plus this code covers mac as well.(which is cmd+a/cmd+c/cmd+v)

加上这段代码也涵盖了mac。（这是cmd+a/cmd+c/cmd+v）

回答by Gacci

That should give you an idea. Sorry I am on a Mac and as far as I know the e.ctrlKey and the like don't work on Mac.

那应该给你一个想法。对不起，我在 Mac 上，据我所知 e.ctrlKey 等在 Mac 上不起作用。

var mod;

var ouput = jQuery('#output');


var numeric = jQuery('#numeric').keydown(function(e){
  mod = e.which;
  
  if(!(e.which >= 48 && e.which <= 57) && (e.which != 8)
  && (mod && (e.which == 67 || e.which != 86))){
      e.preventDefault();
  }
  
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='text' id='numeric'/>

<label id='output'></label>

回答by johan indra Permana

From @Shanimal answer. this is my angular js directive. to use only number to your input.

来自@Sanimal 的回答。这是我的 angular js 指令。只使用数字输入。

.directive('onlyNumber', function() {
        return  {
            restrict: 'A',
            link: function (scope, elm, attrs, ctrl) {
                elm.on("propertychange input",function (event) {
                    event.target.value = event.target.value.replace(/[^0-9]/g,'');
                });
            }
        };
    })

just use 'only-number' to your element. example :

只需对您的元素使用“only-number”即可。例子 ：

<input type="text" data-ng-model="number" placeholder="number"id="cifNumber" only-number/>

回答by Moishe Lipsker

If you change your keydownevent to a keyupevent, you can use e.ctrlKey, which will be truewhen ctrlkey is pressed.

如果您将keydown事件更改为keyup事件，则可以使用e.ctrlKey，这将true在ctrl按下键时发生。

回答by kfreeman04208

function numbersonly(evt) {
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        return false;
    }
    return true;
}