HtmlInputImage.CausesValidation Propriété

Définition

Obtient ou définit une valeur indiquant si une validation est effectuée suite à un clic sur le contrôle HtmlInputImage.Gets or sets a value indicating whether validation is performed when the HtmlInputImage control is clicked.

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, set
Public Property CausesValidation As Boolean
Public Overridable Property CausesValidation As Boolean

Valeur de propriété

Boolean

true si une validation est effectuée suite à un clic sur le contrôle HtmlInputImage ; sinon, false.true if validation is performed when the HtmlInputImage control is clicked; otherwise, false. La valeur par défaut est true.The default value is true.

Exemples

L’exemple de code suivant montre comment utiliser la CausesValidation propriété pour empêcher la validation de la page.The following code example demonstrates how to use the CausesValidation property to prevent page validation from occurring. Notez comment la Validate méthode active chaque contrôle de validation indépendamment.Notice how the Validate method activates each validation control independently.


<%@ 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>

Remarques

Par défaut, la validation de page est effectuée quand l' HtmlInputImage utilisateur clique sur un contrôle.By default, page validation is performed when an HtmlInputImage control is clicked. La validation de page détermine si les contrôles d’entrée associés à un contrôle de validation sur la page passent tous les règles de validation spécifiées par le contrôle de validation.Page validation determines whether the input controls associated with a validation control on the page all pass the validation rules specified by the validation control.

Vous pouvez spécifier ou déterminer si la validation est effectuée sur le client et sur le serveur lorsque l' HtmlInputImage utilisateur clique sur un contrôle à l’aide de la CausesValidation propriété.You can specify or determine whether validation is performed on both the client and the server when an HtmlInputImage control is clicked by using the CausesValidation property. Pour empêcher l’exécution de la validation, affectez à la propriété la valeur CausesValidation false .To prevent validation from being performed, set the CausesValidation property to false.

Cette propriété est couramment utilisée dans le gestionnaire d’événements pour l' ServerClick événement afin d’empêcher la validation de la page lorsque l’utilisateur clique sur un bouton Annuler ou réinitialiser.This property is commonly used in the event handler for the ServerClick event to prevent page validation from occurring when a Cancel or Reset button is clicked.

S’applique à

Voir aussi