如何验证asp.net中的文本框 [英] how to validate textbox in asp.net

问题描述

大家好，请帮帮我，

我必须通过正则表达式或javascript验证asp.net中的文本框. 该用户不能输入任何字母.他们只能在文本框中输入小数.

hi all please help me,

i have to validate textbox in asp.net through regular expression or javascript
that user can not enter any alphabets. They can only enter decimal number into textbox.

推荐答案

尝试以下操作:

try this:

<asp:textbox id="txt_qty" runat="server" columns="2"></asp:textbox>

<asp:requiredfieldvalidator id="r1" runat="server" errormessage="*" controltovalidate="txt_qty"></asp:requiredfieldvalidator>

<asp:regularexpressionvalidator id="regular1" controltovalidate="txt_qty" runat="server" errormessage="*" validationexpression="^\d+

" > /asp:regularexpressionvalidator


这样，您的问题将得到解决...

this way your problem will solve...

您可以通过以下方式完成此操作:
1.AjaxFilteredTextBoxExtender

在这里，您首先添加ajax工具包和此扩展程序的参考.
您可以将ValidChars设置为."用于十进制，允许用户输入带小数点的数字值.

You can done this in following ways:
1.AjaxFilteredTextBoxExtender

here you first add reference of ajax toolkit and this extender.
you can set ValidChars to "." for decimal which allo user to enter numeric value with decimal point.

<ajaxToolkit:FilteredTextBoxExtender ID="ftbe" runat="server"
    TargetControlID="TextBox3"
    FilterType="Custom, Numbers"
    ValidChars="." />

2.使用javscript

< script type ="text/javascript">
//价格文本框只允许数字，只允许2个小数点
函数extractNumber(obj，decimalPlaces，allowNegative)
{
var temp = obj.value;

//如果格式正确，请避免更改内容
var reg0Str =''[0-9] *'';
if(decimalPlaces> 0){
reg0Str + =''\\.?[0-9] {0，''+小数位数+''}'';
}否则，如果(decimalPlaces< 0){
reg0Str + =''\\.?[0-9] *'';
}
reg0Str = allowNegative吗? ''^-?''+ reg0Str:''^''+ reg0Str;
reg0Str = reg0Str +''

2.using javscript

<script type="text/javascript">
// price text-box allow numeric and allow 2 decimal points only
function extractNumber(obj, decimalPlaces, allowNegative)
{
var temp = obj.value;

// avoid changing things if already formatted correctly
var reg0Str = ''[0-9]*'';
if (decimalPlaces > 0) {
reg0Str += ''\\.?[0-9]{0,'' + decimalPlaces + ''}'';
} else if (decimalPlaces < 0) {
reg0Str += ''\\.?[0-9]*'';
}
reg0Str = allowNegative ? ''^-?'' + reg0Str : ''^'' + reg0Str;
reg0Str = reg0Str + ''

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