TextBox.TextChanged Událost

Reference

Definice

Obor názvů:: System.Web.UI.MobileControls

Sestavení:: System.Web.Mobile.dll

Důležité

Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.

Vyvolá se, když uživatel změní text .TextBox Toto rozhraní API je zastaralé. Informace o vývoji ASP.NET mobilních aplikací najdete v tématu Mobilní aplikace & weby s ASP.NET.

public:
 event EventHandler ^ TextChanged;

public event EventHandler TextChanged;

member this.TextChanged : EventHandler

Public Custom Event TextChanged As EventHandler

Event Type

EventHandler

Příklady

Následující příklad ukazuje použití TextChanged události ke změně položek v SelectionList.

<%@ Page Language="C#" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>

<script runat="server">
    void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            // Add items to the list
            SelectionList1.Items.Add(new 
                MobileListItem("Verify transactions","Done"));
            SelectionList1.Items.Add(new 
                MobileListItem("Check balance sheet","Scheduled"));
            SelectionList1.Items.Add(new
                MobileListItem("Call customer", "Done"));
            SelectionList1.Items.Add(new
                MobileListItem("Send checks", "Pending"));
            SelectionList1.Items.Add(new
                MobileListItem("Send report", "Pending"));
            SelectionList1.Items.Add(new
                MobileListItem("Attend meeting", "Scheduled"));

            // Show all items in list
            SelectionList1.Rows = SelectionList1.Items.Count;
        }
    }
    void TextChanged(object sender, EventArgs e)
    {
        // Called during PostBack, if changed
        string task = TextBox1.Text;
        string status = TextBox2.Text;
        
        if (task.Length > 0 && status.Length > 0)
        {

            MobileListItem li = new MobileListItem(task, status);
            
            // Remove the item if it exists
            if (SelectionList1.Items.Contains(li))
                SelectionList1.Items.Remove(li);
            else
                // Add the item if it does not exist
                SelectionList1.Items.Add(li);

            // Clear the text boxes
            TextBox1.Text = String.Empty;
            TextBox2.Text = String.Empty;
        }

        // Display all items.
        SelectionList1.Rows = SelectionList1.Items.Count;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
    <mobile:Form id="Form1" runat="server">
        <mobile:Label Id="Label1" runat="server">
            Create a new Task with Status</mobile:Label>   
        <mobile:SelectionList runat="server" BreakAfter="true" 
            SelectType="ListBox"
            id="SelectionList1" />
        <mobile:Label Id="Label2" runat="server" 
            Text="Enter the Task name" />
        <mobile:TextBox runat="server" id="TextBox1" 
            OnTextChanged="TextChanged" />
        <mobile:Label Id="Label3" runat="server" 
            Text="Enter the Task status" />
        <mobile:TextBox runat="server" id="TextBox2" />
        <mobile:Command ID="Command1" runat="server" 
            Text="Submit" />
    </mobile:Form>
</body>
</html>

<%@ Page Language="VB" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>

<script runat="server">
    Protected Sub Page_Load(ByVal byvalsender As Object, _
        ByVal e As EventArgs)

        If Not IsPostBack Then
            ' Add items to the list
            SelectionList1.Items.Add(New _
                MobileListItem("Verify transactions", "Done"))
            SelectionList1.Items.Add(New _
                MobileListItem("Check balance sheet", "Scheduled"))
            SelectionList1.Items.Add(New _
                MobileListItem("Call customer", "Done"))
            SelectionList1.Items.Add(New _
                MobileListItem("Send checks", "Pending"))
            SelectionList1.Items.Add(New _
                MobileListItem("Send report", "Pending"))
            SelectionList1.Items.Add(New _
                MobileListItem("Attend meeting", "Scheduled"))

            ' Show all items in list
            SelectionList1.Rows = SelectionList1.Items.Count
        End If
    End Sub
    
    Private Sub TextChanged(ByVal sender As Object, _
        ByVal e As EventArgs)

        ' Called during PostBack, if changed
        Dim task As String = TextBox1.Text
        Dim status As String = TextBox2.Text
        
        If (task.Length > 0 AndAlso status.Length > 0) Then
            Dim li As New MobileListItem(task, status)

            ' Remove the item if it exists
            If (SelectionList1.Items.Contains(li)) Then
                SelectionList1.Items.Remove(li)
            Else
                ' Add the item if it does not exist
                SelectionList1.Items.Add(li)
            End If

            ' Clear the text boxes
            TextBox1.Text = String.Empty
            TextBox2.Text = String.Empty
        End If

        ' Display all items.
        SelectionList1.Rows = SelectionList1.Items.Count
    End Sub
</script>

<html xmlns="http:'www.w3.org/1999/xhtml" >
<body>
    <mobile:Form id="Form1" runat="server">
        <mobile:Label Id="Label1" runat="server">
            Create a new Task with Status</mobile:Label>   
        <mobile:SelectionList runat="server" 
            SelectType="ListBox"
            id="SelectionList1" />
        <mobile:Label Id="Label2" runat="server" 
            Text="Enter the Task name" />
        <mobile:TextBox runat="server" id="TextBox1" 
            OnTextChanged="TextChanged" />
        <mobile:Label Id="Label3" runat="server" 
            Text="Enter the Task status" />
        <mobile:TextBox runat="server" id="TextBox2" />
        <mobile:Command ID="Command1" runat="server" 
            Text="Submit" />
    </mobile:Form>
</body>
</html>

Poznámky

Když uživatel změní text TextBox, tato událost není vyvolána okamžitě. Formulář musí obsahovat Command k zahájení události postback, která událost vyvolá TextChanged .

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