HtmlInputImage.CausesValidation Egenskap
Definition
Viktigt
En del information gäller för förhandsversionen av en produkt och kan komma att ändras avsevärt innan produkten blir allmänt tillgänglig. Microsoft lämnar inga garantier, uttryckliga eller underförstådda, avseende informationen som visas här.
Hämtar eller anger ett värde som anger om verifieringen utförs när HtmlInputImage kontrollen klickas.
public:
property bool CausesValidation { bool get(); void set(bool value); };public:
virtual property bool CausesValidation { bool get(); void set(bool value); };public bool CausesValidation { get; set; }public virtual bool CausesValidation { get; set; }member this.CausesValidation : bool with get, setPublic Property CausesValidation As BooleanPublic Overridable Property CausesValidation As BooleanEgenskapsvärde
trueom verifieringen utförs när HtmlInputImage kontrollen klickas, annars . false Standardvärdet är true.
Exempel
Följande kodexempel visar hur du använder CausesValidation egenskapen för att förhindra att sidvalidering sker. Observera hur Validate metoden aktiverar varje valideringskontroll oberoende av varandra.
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void SubmitButton_Click(Object sender, ImageClickEventArgs e)
{
// Determine which button was clicked.
switch (((HtmlInputImage)sender).ID)
{
case "CityQueryButton":
// Validate only the controls used for the city query.
CityReqValidator.Validate();
// Take the appropriate action if the controls pass validation.
if (CityReqValidator.IsValid)
{
Message.InnerHtml = "You have chosen to run a query for the following city: " +
CityTextBox.Value;
}
break;
case "StateQueryButton":
// Validate only the controls used for the state query.
StateReqValidator.Validate();
// Take the appropriate action if the controls pass validation.
if (StateReqValidator.IsValid)
{
Message.InnerHtml = "You have chosen to run a query for the following state: " +
StateTextBox.Value;
}
break;
default:
// If the button clicked is not recognized, erase the message on the page.
Message.InnerHtml = "";
break;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title> HtmlInputImage CausesValidation Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3> HtmlInputImage CausesValidation Example </h3>
<table border="1" cellpadding="10">
<tr>
<td>
<b>Enter city to query.</b> <br />
<input id="CityTextBox"
type="Text"
runat="server"/>
<asp:RequiredFieldValidator
ID="CityReqValidator"
ControlToValidate="CityTextBox"
ErrorMessage="<br />Please enter a city."
Display="Dynamic"
EnableClientScript="False"
runat="server"/>
</td>
<td valign="bottom">
<input id="CityQueryButton"
alt="City Submit button"
type="Image"
src="image.jpg"
causesvalidation="False"
onserverclick="SubmitButton_Click"
runat="server"/>
</td>
</tr>
<tr>
<td>
<b>Enter state to query.</b> <br />
<input id="StateTextBox"
type="Text"
runat="server"/>
<asp:RequiredFieldValidator ID="StateReqValidator"
ControlToValidate="StateTextBox"
ErrorMessage="<br />Please enter a state."
Display="Dynamic"
EnableClientScript="False"
runat="server"/>
</td>
<td valign="bottom">
<input id="StateQueryButton"
alt="State Submit button"
type="Image"
src="image.jpg"
causesvalidation="False"
onserverclick="SubmitButton_Click"
runat="server"/>
</td>
</tr>
</table>
<br /><br />
<span id="Message"
runat="Server"/>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub SubmitButton_Click(ByVal sender As Object, ByVal e As ImageClickEventArgs)
' Determine which button was clicked.
Select Case (CType(sender, HtmlInputImage)).ID
Case "CityQueryButton"
' Validate only the controls used for the city query.
CityReqValidator.Validate()
' Take the appropriate action if the controls pass validation.
If CityReqValidator.IsValid Then
Message.InnerHtml = "You have chosen to run a query for the following city: " & _
CityTextBox.Value
End If
Case "StateQueryButton"
' Validate only the controls used for the state query.
StateReqValidator.Validate()
' Take the appropriate action if the controls pass validation.
If StateReqValidator.IsValid Then
Message.InnerHtml = "You have chosen to run a query for the following state: " & _
StateTextBox.Value
End If
Case Else
' If the button clicked isn not recognized, erase the message on the page.
Message.InnerHtml = ""
End Select
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title> HtmlInputImage CausesValidation Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3> HtmlInputImage CausesValidation Example </h3>
<table border="1" cellpadding="10">
<tr>
<td>
<b>Enter city to query.</b> <br />
<input id="CityTextBox"
type="Text"
runat="server"/>
<asp:RequiredFieldValidator ID="CityReqValidator"
ControlToValidate="CityTextBox"
ErrorMessage="<br />Please enter a city."
Display="Dynamic"
EnableClientScript="False"
runat="server"/>
</td>
<td valign="bottom">
<input id="CityQueryButton"
alt="City Submit button"
type="Image"
src="SubmitImage.jpg"
causesvalidation="False"
onserverclick="SubmitButton_Click"
runat="server"/>
</td>
</tr>
<tr>
<td>
<b>Enter state to query.</b> <br />
<input id="StateTextBox"
type="Text"
runat="server"/>
<asp:RequiredFieldValidator ID="StateReqValidator"
ControlToValidate="StateTextBox"
ErrorMessage="<br />Please enter a state."
Display="Dynamic"
EnableClientScript="False"
runat="server"/>
</td>
<td valign="bottom">
<input id="StateQueryButton"
alt="State Submit button"
type="Image"
src="SubmitImage.jpg"
causesvalidation="False"
onserverclick="SubmitButton_Click"
runat="server"/>
</td>
</tr>
</table>
<br /><br />
<span id="Message"
runat="Server"/>
</form>
</body>
</html>
Kommentarer
Som standard utförs sidvalidering när en HtmlInputImage kontroll klickas. Sidvalidering avgör om de indatakontroller som är associerade med en valideringskontroll på sidan uppfyller alla valideringsregler som angetts av verifieringskontrollen.
Du kan ange eller avgöra om verifieringen utförs på både klienten och servern när en HtmlInputImage kontroll klickas med hjälp CausesValidation av egenskapen . Om du vill förhindra att verifieringen utförs anger du egenskapen CausesValidation till false.
Den här egenskapen används ofta i händelsehanteraren för händelsen för ServerClick att förhindra att sidvalidering inträffar när knappen Avbryt eller Återställ klickas.
