仅允许数字和 ctrl+a 、 ctrl+v 、 ctrl+c 到文本框

Question

我试图让用户只输入数字并将控件复制并粘贴到文本框。我可以限制用户只输入数字，但复制、粘贴对我不起作用，请帮我解决这个问题。

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();
    }
});

这是 jsfiddle link:

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

Answer 1

如果您将 keydown 事件更改为 keyup 事件，则可以使用 e.ctrlKey，按下 ctrl 键时将为 true .

Answer 2

像这样 event.keyCode and event.metaKey 试试。

$(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" />

编辑：

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;
}

因为按C和V复制粘贴时ctrlDown会变成false。因此你的 ctr+c 和 ctrl+v 不工作。

Answer 3

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;
}

Answer 4

$(".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();
        }
});

这是工作示例

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

这允许您 ctrl+a、ctrl+c 和 ctrl+v 以及箭头键、删除键和退格键。

此外，此代码还涵盖了 mac。（即 cmd+a/cmd+c/cmd+v）

Answer 5

这应该会给你一个想法。抱歉，我在 Mac 上，据我所知，e.ctrlKey 之类的东西在 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>

Answer 6

$(".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" />

Answer 7

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

.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,'');
                });
            }
        };
    })

只需对您的元素使用 'only-number'。示例：

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

Answer 8

$('.numericOnly').on('keydown keyup', function (e) {
    // Allow: backspace, delete, tab, escape, enter and .
    if ($.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();
    }
    //Ensure that bulk number pasted is numeric only
    let n = $(this).val()
    if (!isNaN(parseFloat(n)) && isFinite(n)) {
    } else {
        $(this).val("")
    }
})

仅允许数字和 ctrl+a 、 ctrl+v 、 ctrl+c 到文本框

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

javascript

jquery

regex

keycode