限制文本框输入

    <script src="../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $("#TextBox1").keypress(function (e) {
                alert(event.keyCode);
                if (((event.keyCode < 48 || event.keyCode > 57) && event.keyCode != 46) ||  //只能输入字母和“.”
                     (/\.\d$/.test($("#TextBox1").val())) ||                               //只能输入一位小数
                     (event.keyCode == 46 && ($("#TextBox1").val().length == 0 || $("#TextBox1").val().indexOf(".") != -1)) //当输入“.”是不能是第一位而且在输入框中不能含有“.”
                     ) {
                    return false;
                }


            })
        })
    </script>

<script>
    function regInput(obj, reg, inputStr)
    {
        var docSel    = document.selection.createRange()
        if (docSel.parentElement().tagName != "INPUT")    return false
        oSel = docSel.duplicate()
        oSel.text = ""
        var srcRange    = obj.createTextRange()
        oSel.setEndPoint("StartToStart", srcRange)
        var str = oSel.text + inputStr + srcRange.text.substr(oSel.text.length)
        return reg.test(str)
    }
</script>

小写英文：<xmp style= "display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^[a-z]*$/,        String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^[a-z]*$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^[a-z]*$/,        event.dataTransfer.getData('Text'))"
        style="ime-mode:Disabled"
><br>

大写英文：<xmp style= "display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^[A-Z]*$/,        String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^[A-Z]*$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^[A-Z]*$/,        event.dataTransfer.getData('Text'))"
        style="ime-mode:Disabled">
<br>

任意数字：<xmp style="display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^[0-9]*$/,        String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^[0-9]*$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^[0-9]*$/,        event.dataTransfer.getData('Text'))"
        style="ime-mode:Disabled"
><br>

限2位小数：<xmp style="display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^\d*\.?\d{0,2}$/,        String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^\d*\.?\d{0,2}$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^\d*\.?\d{0,2}$/,        event.dataTransfer.getData('Text'))"
        style="ime-mode:Disabled"
> 如: 123.12<br>


日　  期：<xmp style="display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^\d{1,4}([-\/](\d{1,2}([-\/](\d{1,2})?)?)?)?$/,        String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^\d{1,4}([-\/](\d{1,2}([-\/](\d{1,2})?)?)?)?$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^\d{1,4}([-\/](\d{1,2}([-\/](\d{1,2})?)?)?)?$/,        event.dataTransfer.getData('Text'))"
        style="ime-mode:Disabled"
> 如: 2002-9-29<br>

任意中文：<xmp style="display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^$/,                    String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^[\u4E00-\u9FA5]*$/,    window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^[\u4E00-\u9FA5]*$/,    event.dataTransfer.getData('Text'))"
><br>

部分英文：<xmp style="display:inline">    </xmp>
<input    onkeypress    = "return regInput(this,    /^[a-e]*$/,        String.fromCharCode(event.keyCode))"
        onpaste        = "return regInput(this,    /^[a-e]*$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^[a-e]*$/,        event.dataTransfer.getData('Text'))"
        style="ime-mode:Disabled"
> 范围: a,b,c,d,e<br>

部分中文：<xmp style="display:inline">    </xmp>

<script language=javascript>
function checkChinese(oldLength, obj)
{
    var oTR = window.document.selection.createRange()
    var reg = /[^一二三四五六七八九十]/g
    oTR.moveStart("character", -1*(obj.value.length-oldLength))
    oTR.text = oTR.text.replace(reg, "")
}
</script>
<input    onkeypress="return false" onkeydown="setTimeout('checkChinese('+this.value.length+','+this.uniqueID+')', 1)"
        onpaste        = "return regInput(this,    /^[一二三四五六七八九十]*$/,        window.clipboardData.getData('Text'))"
        ondrop        = "return regInput(this,    /^[一二三四五六七八九十]*$/,        event.dataTransfer.getData('Text'))"
> 范围: 一二三四五六七八九十<br>

转载于:https://www.cnblogs.com/gf345725726/archive/2011/10/14/2212242.html