Sunday, 18 October 2015

ClientIDMode Enumeration in ASP.Net



Specifies how ASP.NET generates the ClientID for a control that can be accessed in client script.
MemberName
Description
AutoID
The ClientID value is generated by concatenating the ID values of each parent naming container with the ID value of the control. In data-binding scenarios where multiple instances of a control are rendered, an incrementing value is inserted in front of the control's ID value. Each segment is separated by an underscore character (_). This algorithm is the only one that was available in versions of ASP.NET earlier than ASP.NET 4.
<input name="ctl00$MainContent$txtMinfire" type="text" value="Proud to be Mindfireans" id="ctl00_MainContent_txtMinfire" />
Inherit
The control inherits the ClientIDMode setting of its NamingContainer control.
<input name="ctl00$MainContent$txtMinfire" type="text" value="Proud to be Mindfireans" id="MainContent_txtMinfire" />
Predictable
This algorithm is used for controls that are in data-bound controls. The ClientID value is generated by concatenating the ClientID value of the parent naming container with the ID value of the control. If the control is a data-bound control that generates multiple rows, the value of the data field specified in the ClientIDRowSuffix property is added at the end. For the GridView control, multiple data fields can be specified. If the ClientIDRowSuffix property is blank, a sequential number is added at the end instead of a data field value. Each segment is separated by an underscore character (_).
<asp:GridView ID="gvCustomers" ClientIDMode="Static" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:TextBox ID="txtName" ClientIDMode="Predictable" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Static
The ClientID value is set to the value of the ID property. If the control is a naming container, the control is used as the top of the hierarchy of naming containers for any controls that it contains.
<input name="ctl00$MainContent$txtMinfire" type="text" value="Proud to be Mindfireans" id="txtMinfire" />

You use the ClientIDMode enumeration when you set the ClientIDMode property for a control. The value that you assign to the ClientIDMode property determines how the ClientID property is generated. The value of the ClientID property is rendered as the id attribute in markup, and it is the value that you use to access the control from client script. The value that you assign to the ClientIDMode property does not affect the ID property of the server control, only the id attribute of the corresponding HTML element.
The default value of ClientIDMode for a page is Predictable. The default value of ClientIDMode for a control is Inherit.
Because the default for controls is Inherit, the default generation mode is Predictable. (However, if you use Visual Studio to convert a Web project to ASP.NET 4 from an earlier version, Visual Studio automatically sets the site default to AutoID in the Web.config file.)
You can set the ClientIDMode value for all pages in a Web site by setting the pages element in the site's Web.config file. You can set the ClientIDMode value for a page in the @ Page directive.




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