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Saturday, March 25, 2006
The RegularExpressionValidator Control(Chapter3)
The RegularExpressionValidator control is typically used to match an input pattern. As an example, let us assume that the value of hours-worked field must have one to three digits. In this case, we will add a RegularExpressionValidator to the txtHcontrol. In the RegularExpression property of the RegularExpressionValidator, we will specify a pattern /d{1,3}. This will force the system to raise an error if the user input is not one-to-three digits long.The output of this application is shown in Figure 3.52.
Figure 3.52 Using RegularExpressionValidator Controls
Figure 3.53 Validator2.aspx
<!—- Chapter3\Validator2.aspx —>
<%@ Page Language="VB" Debug="true" %>
<html><head</head><body>
<form runat="server"><br>
Enter Your Name:
<asp:TextBox id="txtName" rows="1 " width="60" runat="server"/>
<asp:RequiredFieldValidator id="validTxtName" runat="server"
controlToValidate="txtName" errorMessage="Name must be entered"
display="static">
</asp:RequiredFieldValidator></br>
Hours worked?
<asp:TextBox id="txtH" width ="40" runat="server" />
<asp:RequiredFieldValidator id="validTxtH" runat="server"
controlToValidate="txtH" errorMessage="Hours must be entered"
display="static">
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator id="regvH"
runat="server" display="static" controlToValidate="txtH"
errorMessage="Hours must be 1-3 digits only"
validationExpression="\d{1,3}">
</asp:RegularExpressionValidator></br>
<asp:Button id="btnSubmit" runat="server" text="Submit" />
</form></body></html>
Figure 3.52 Using RegularExpressionValidator Controls
Figure 3.53 Validator2.aspx
<!—- Chapter3\Validator2.aspx —>
<%@ Page Language="VB" Debug="true" %>
<html><head</head><body>
<form runat="server"><br>
Enter Your Name:
<asp:TextBox id="txtName" rows="1 " width="60" runat="server"/>
<asp:RequiredFieldValidator id="validTxtName" runat="server"
controlToValidate="txtName" errorMessage="Name must be entered"
display="static">
</asp:RequiredFieldValidator></br>
Hours worked?
<asp:TextBox id="txtH" width ="40" runat="server" />
<asp:RequiredFieldValidator id="validTxtH" runat="server"
controlToValidate="txtH" errorMessage="Hours must be entered"
display="static">
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator id="regvH"
runat="server" display="static" controlToValidate="txtH"
errorMessage="Hours must be 1-3 digits only"
validationExpression="\d{1,3}">
</asp:RegularExpressionValidator></br>
<asp:Button id="btnSubmit" runat="server" text="Submit" />
</form></body></html>
posted by Mr.Q at 11:43 PM
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