$(document).ready(function() {
    $("#txtboxToFilter").keydown(function(event) {
        // Allow only backspace and delete
        if ( event.keyCode == 46 || event.keyCode == 8 ) {
            // let it happen, don't do anything
        }
        else {
            // Ensure that it is a number and stop the keypress
            if (event.keyCode < 48 || event.keyCode > 57 ) {
                event.preventDefault(); 
            }   
        }
    });
});

来源:http://snipt.net/GerryEng/jquery-making-textfield-only-accept-numeric-values

如果有一个平滑的onlineer:

<input type="text" onkeypress="return /[0-9]/i.test(event.key)" >

下面是另一种方法。这也可以用于粘贴。[用于字母-数字验证]

//Input Validation
var existingLogDescription = "";

$('.logDescription').keydown(function (event) {
    existingLogDescription = this.value;

});


$('.logDescription').keyup(function () {
    if (this.value.match(/[^a-zA-Z0-9 ]/g)) {
        alert("Log Description should contain alpha-numeric values only");
        this.value = this.value.replace(/[^a-zA-Z0-9 ]/g, '');
        this.value = existingLogDescription;
    }
});

需要确保你有数字键盘和tab键工作

 // Allow only backspace and delete
            if (event.keyCode == 46 || event.keyCode == 8  || event.keyCode == 9) {
                // let it happen, don't do anything
            }
            else {
                // Ensure that it is a number and stop the keypress
                if ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105)) {

                }
                else {
                    event.preventDefault();
                }
            }

我建议检查事件。我也带着。如果设置为true，用户可能会执行类似cmd-A的操作来选择字段中的所有文本。你也应该承认这一点。

我想出了一个非常好的简单的解决方案，它不会像其他解决方案那样阻止用户选择文本或复制粘贴。jQuery样式:)

$("input.inputPhone").keyup(function() {
    var jThis=$(this);
    var notNumber=new RegExp("[^0-9]","g");
    var val=jThis.val();

    //Math before replacing to prevent losing keyboard selection 
    if(val.match(notNumber))
    { jThis.val(val.replace(notNumber,"")); }
}).keyup(); //Trigger on page load to sanitize values set by server