文本框的自定义验证 [英] Custom validation for textbox

问题描述

我有一个文本框应该接受用户ID，它应该以你开头，然后是7个数字。



可以任何一个请帮帮我。

I have a text box which should accept the userid in such a way that it should start with an "u" and then 7 numbers.

can any one help me out please.

推荐答案

那么你可以使用RegularExpressionValidator，它是ASp的控制以及Regex的组合....



如下所示。

Well You can use RegularExpressionValidator which is a control of ASp along with combination of Regex....

Like below.

<asp:RegularExpressionValidator ID="validator1" runat="server" BackColor="Red" ControlToValidate="ControlID" ValidationExpression="[u]{1}[0-9]{7}" ErrorMessage="ValidationMessageHere" >
  </asp:RegularExpressionValidator>

[u] {1} [0-9] {7} 将允许以'u'开头的字符串后跟7位数...



如果你想让用户输入1到7之间的数字，你可以使用以下数字。 >



[u] {1} [0-9] {0,7}



它会允许



u12

u123

u1234

..... u1234567



希望这可以解决您的疑问... :)

[u]{1}[0-9]{7} will allow a string starting with 'u' followed by 7 digits...

if you want to allow user to enter numbers counting between 1 and 7 dn you can use the following..>

[u]{1}[0-9]{0,7}

it will allow

u12
u123
u1234
..... u1234567

Hope this can solve your query... :)

<asp:TextBox ID="txt_userid" runat="server" />
    <asp:CustomValidator ID="CustomValidator" runat="server"     EnableClientScript="true"

        ErrorMessage="Userid should start with letter u followed with 7 digits"

        ClientValidationFunction="validateuserid"

        ControlToValidate="txt_userid" Display="Dynamic" >
    </asp:CustomValidator>

< script type =text / javascript>



函数validateuserid（sender，args）{

var Userid = document.getElementById（'txt_userid'）。value;



if（Userid.length == 8）{

if（Userid.substring（0,1）=='u'）{

args.IsValid = true; < br $> b $ b}

else {

var regex ='^ [0-9] {7}

<script type="text/javascript">

function validateuserid(sender, args) {
var Userid = document.getElementById('txt_userid').value;

if (Userid.length == 8) {
if (Userid.substring(0, 1) == 'u') {
args.IsValid = true;
}
else {
var regex = '^[0-9]{7}

';

var str = Userid.substring（1,8）

if（str.search（regex）== -1）{

args.IsValid = false;

}

else {

args.IsValid = true;

}

}

}

else {

args.IsValid = false;

}

}

';
var str = Userid.substring(1, 8)
if (str.search(regex) == -1) {
args.IsValid = false;
}
else {
args.IsValid = true;
}
}
}
else {
args.IsValid = false;
}
}

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