保持插入符号在输入中的位置的其他方法:

$(document).ready(function() {
  $('.numbersOnly').on('input', function() {
    var position = this.selectionStart - 1;

    fixed = this.value.replace(/[^0-9\.]/g, '');  //remove all but number and .
    if(fixed.charAt(0) === '.')                  //can't start with .
      fixed = fixed.slice(1);

    var pos = fixed.indexOf(".") + 1;
    if(pos >= 0)
      fixed = fixed.substr(0,pos) + fixed.slice(pos).replace('.', '');  //avoid more than one .

    if (this.value !== fixed) {
      this.value = fixed;
      this.selectionStart = position;
      this.selectionEnd = position;
    }
  });
});

优点:

用户可以使用方向键、退格键、删除键、… 当你想要粘贴数字的时候就可以了

Plunker:演示工作

戴夫·亚伦·史密斯，谢谢你的帖子

我编辑了你的答案，接受小数点和数字的数字部分。这个工作非常适合我。

$(".numeric").keypress(function(event) {
  // Backspace, tab, enter, end, home, left, right,decimal(.)in number part, decimal(.) in alphabet
  // We don't support the del key in Opera because del == . == 46.
  var controlKeys = [8, 9, 13, 35, 36, 37, 39,110,190];
  // IE doesn't support indexOf
  var isControlKey = controlKeys.join(",").match(new RegExp(event.which));
  // Some browsers just don't raise events for control keys. Easy.
  // e.g. Safari backspace.
  if (!event.which || // Control keys in most browsers. e.g. Firefox tab is 0
      (49 <= event.which && event.which <= 57) || // Always 1 through 9
      (96 <= event.which && event.which <= 106) || // Always 1 through 9 from number section 
      (48 == event.which && $(this).attr("value")) || // No 0 first digit
      (96 == event.which && $(this).attr("value")) || // No 0 first digit from number section
      isControlKey) { // Opera assigns values for control keys.
    return;
  } else {
    event.preventDefault();
  }
});

我用了这个，效果很好。

ini=$("#id").val();
a=0;
$("#id").keyup(function(e){
    var charcode = (e.which) ? e.which : e.keyCode;
    // for decimal point
    if(!(charcode===190 || charcode===110))
    {           // for numeric keys andcontrol keys
        if (!((charcode>=33 && charcode<=57) || 
        // for numpad numeric keys
        (charcode>=96 && charcode<=105) 
        // for backspace
        || charcode==8)) 
        {
            alert("Sorry! Only numeric values allowed.");
            $("#id").val(ini);
        }
        // to include decimal point if first one has been deleted.
        if(charcode===8)
        {
            ini=ini.split("").reverse();
            if(ini[0]==".")
            a=0;                 
        }
    }
    else
    {
        if(a==1)
        {
            alert("Sorry! Second decimal point not allowed.");
            $("#id").val(ini);
        }
        a=1;
    }
    ini=$("#id").val();
});


find keycodes at http://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes

你看不到字母的神奇出现和消失的关键下来。这也适用于鼠标粘贴。

$('#txtInt').bind('input propertychange', function () {
    $(this).val($(this).val().replace(/[^0-9]/g, ''));
});

我认为最好的答案就是上面的方法。

jQuery('.numbersOnly').keyup(function () {  
    this.value = this.value.replace(/[^0-9\.]/g,''); 
});

但我同意这是一个有点痛苦的方向键和删除按钮快照光标到字符串的末尾(因为它被踢回给我在测试)

我添加了一个简单的更改

$('.numbersOnly').keyup(function () {
    if (this.value != this.value.replace(/[^0-9\.]/g, '')) {
       this.value = this.value.replace(/[^0-9\.]/g, '');
    }
});

这样，如果有任何按钮点击，不会导致文本被改变，忽略它。有了这个，你可以点击箭头和删除，而不跳到最后，但它清除任何非数字文本。

也允许负数

下面的代码也接受负数

HTML

<input type="text" name="myText" />

JS

var pastValue, pastSelectionStart, pastSelectionEnd;

$("input").on("keydown", function() {
    pastValue          = this.value;
    pastSelectionStart = this.selectionStart;
    pastSelectionEnd   = this.selectionEnd;
}).on("input propertychange", function() {

    if ( this.value.length > 0 && $.isNumeric(this.value) == false && this.value != '-' ) {
        this.value          = pastValue;
        this.selectionStart = pastSelectionStart;
        this.selectionEnd   = pastSelectionEnd;
    }
}).on('blur', function(){
        if(this.value == '-')
            this.value = '';
});