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Session 4Session 4

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Session ObjectivesSession Objectives

Explore the various Validation Controls

Explain code behind

Implement code behind

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Validation ControlsValidation ControlsRestricts blank field

Compares two fields

Checks for specified range

Checks value with expression

Checks value by client-side or server-side functionLists validation errors of all controls on the page

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No value

is entere

d

No value

is entere

d

Inline error

message

Inline error

message

<asp:requiredfieldvalidator controltovalidate="userid" display="static" errormessage="You must enter your user id." runat=server>The User Id cannot be left Blank!</asp:requiredfieldvalidator>

<asp:requiredfieldvalidator controltovalidate="userid" display="static" errormessage="You must enter your user id." runat=server>The User Id cannot be left Blank!</asp:requiredfieldvalidator>

RequiredFieldVRequiredFieldValidatoralidator

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Dynamic Display

Validation Validation Error MessageError Message

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<asp:comparevalidator controltovalidate="pwd_con" display="static" errormessage="the confirmation password does not match." controltocompare="pwd" type="String" operator="Equal" runat=server> *</asp:comparevalidator>

<asp:comparevalidator controltovalidate="pwd_con" display="static" errormessage="the confirmation password does not match." controltocompare="pwd" type="String" operator="Equal" runat=server> *</asp:comparevalidator>

<asp:comparevalidator controltovalidate="bid" display="static" errormessage="You cannot enter a bid for lesser than $100.“ valuetocompare=100 type="Integer" operator="GreaterThanEqual" runat="server">*</asp:comparevalidator>

<asp:comparevalidator controltovalidate="bid" display="static" errormessage="You cannot enter a bid for lesser than $100.“ valuetocompare=100 type="Integer" operator="GreaterThanEqual" runat="server">*</asp:comparevalidator>

String, Integer, DateTime, Currency,

Double

String, Integer, DateTime, Currency,

Double

= , < , > , <= , >= , Not Equal

Comparing with static value, 100

CompareCompareValidatorValidator

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<asp:rangevalidator controltovalidate="r3" type="Integer" minimumvalue="1" maximumvalue="99"errormessage="Your age must be in the range of 1-99 yrs" display="static" runat="server" > *</asp:rangevalidator>

<asp:rangevalidator controltovalidate="r3" type="Integer" minimumvalue="1" maximumvalue="99"errormessage="Your age must be in the range of 1-99 yrs" display="static" runat="server" > *</asp:rangevalidator>

<asp:rangevalidator controltovalidate="r4" type="Integer" minimumcontrol="r1" maximumcontrol="r2"errormessage="Your age must be in the range of 1-99 yrs" display="static" runat="server" > *</asp:rangevalidator>

<asp:rangevalidator controltovalidate="r4" type="Integer" minimumcontrol="r1" maximumcontrol="r2"errormessage="Your age must be in the range of 1-99 yrs" display="static" runat="server" > *</asp:rangevalidator>

Specify value of the control for the

range

Specify name of the control for the range

RangeValRangeValidatoridator

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Sign Meaning

^ The caret sign ^ specifies that checking starts from here

$ The “$” sign specifies that the checking ends here

[] Square brackets “[]” checks that the value entered match with any of the characters that are in the square brackets. \w “\w” allows any value to be entered

/d{} “/d” specifies that the value entered is a digit and {} specifies the number of occurrences of the specified data type+ The + sign indicates that one or more elements to be added to the expression being checked

RegularExpressionRegularExpressionValidator - 1Validator - 1

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<asp:regularexpressionvalidator controltovalidate="emailid" display="static" validationexpression="^[\w-]+@[\w-]+\.(com|net|org|edu|mil)$" runat=server>Not a valid e-mail address</asp:RegularExpressionValidator>

Validate an email id

RegularExpressionRegularExpressionValidator - 2Validator - 2

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<asp:customvalidator runat="server" controltovalidate="grade" clientvalidationfunction="clval"onservervalidate="serval" display="static">Wrong value</asp:customvalidator>

<asp:customvalidator runat="server" controltovalidate="grade" clientvalidationfunction="clval"onservervalidate="serval" display="static">Wrong value</asp:customvalidator>

Client-side function

CustomVCustomValidator alidator

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<asp:validationsummary id="vs1" headertext="The errors found are: " displaymode="singleparagraph" runat="server"/> </asp:customvalidator>

<asp:validationsummary id="vs1" headertext="The errors found are: " displaymode="singleparagraph" runat="server"/> </asp:customvalidator>

ValidationValidationSummarySummary

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Page.IsValid Page.IsValid PropertyProperty<script language="C#" runat="server" >

void validate_page(Object Src, EventArgs E){ if (Page.IsValid == true) { lbl.Text = "Page is Valid!";} else { lbl.Text = "Page is not Valid!"; } } </script>

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<%@ Page ClientTarget=DownLevel %> <%@ Page ClientTarget=DownLevel %>

disable client-side validation

Uplevel and Uplevel and Downlevel Downlevel BrowsersBrowsers

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<%@ Page language="C#" Inherits="codeb" %> <html><script language="C#" runat ="server" ></script><form runat="server"><asp:button OnClick="bMe_Click" text="Click me!" id="bMe" runat="server"/><br><br><br><br><asp:label id="lb1" runat="server"/></form></html>

<%@ Page language="C#" Inherits="codeb" %> <html><script language="C#" runat ="server" ></script><form runat="server"><asp:button OnClick="bMe_Click" text="Click me!" id="bMe" runat="server"/><br><br><br><br><asp:label id="lb1" runat="server"/></form></html>

Provides the

functionality

Code Code Behind - Behind - 11

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using System;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public class codeb: Page{ public System.Web.UI.WebControls.Label lb1; public System.Web.UI.WebControls.Button bMe; protected void bMe_Click(Object sender, EventArgs e) {

lb1.Text = "Clicked!"; } void Main() { }}

using System;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public class codeb: Page{ public System.Web.UI.WebControls.Label lb1; public System.Web.UI.WebControls.Button bMe; protected void bMe_Click(Object sender, EventArgs e) {

lb1.Text = "Clicked!"; } void Main() { }}

BIN

Code Code Behind - 2Behind - 2