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Dynamically control the explicit and hidden panel and control its content

Source: Internet
Author: User
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The panel control on the first floor is a container of other controls. This control is especially useful if you plan to generate multiple controls programmatically or hide/display a group of controls.

The following example shows how to use the panel control to generate controls programmatically and hide/display a group of controls.

<% @ Page Language = "C #" %>
<HTML>
<Head>

<SCRIPT runat = "server">

Void page_load (Object sender, eventargs e ){

// Show or hide the Panel contents.

If (check1.checked ){
Panel1.visible = false;
}
Else {
Panel1.visible = true;
}

// Generate the label controls.

Int numlabels = int32.parse (dropdown1.selecteditem. value );

For (INT I = 1; I <= numlabels; I ++ ){
Label L = new label ();
L. Text = "label" + (I). tostring ();
L. ID = "label" + (I). tostring ();
Panel1.controls. Add (L );
Panel1.controls. Add (New literalcontrol ("<br> "));
}

// Generate the textbox controls.

Int numtexts = int32.parse (dropdown2.selecteditem. value );

For (INT I = 1; I <= numtexts; I ++ ){
Textbox T = new Textbox ();
T. Text = "textbox" + (I). tostring ();
T. ID = "textbox" + (I). tostring ();
Panel1.controls. Add (t );
Panel1.controls. Add (New literalcontrol ("<br> "));
}
}

</SCRIPT>

</Head>
<Body>

<H3> panel example
<Form runat = Server>

<Asp: Panel id = "Panel1" runat = "server"
Backcolor = "gainsboro"
Height = "200px"
Width = "300px">

Panel1: Here is some static content...
<P>

</ASP: Panel>

<P>

Generate labels:
<Asp: dropdownlist id = dropdown1 runat = "server">
<Asp: listitem value = "0"> 0 </ASP: listitem>
<Asp: listitem value = "1"> 1 </ASP: listitem>
<Asp: listitem value = "2"> 2 </ASP: listitem>
<Asp: listitem value = "3"> 3 </ASP: listitem>
<Asp: listitem value = "4"> 4 </ASP: listitem>
</ASP: dropdownlist>

<Br>

Generate textboxes:
<Asp: dropdownlist id = dropdown2 runat = "server">
<Asp: listitem value = "0"> 0 </ASP: listitem>
<Asp: listitem value = "1"> 1 </ASP: listitem>
<Asp: listitem value = "2"> 2 </ASP: listitem>
<Asp: listitem value = "3"> 3 </ASP: listitem>
<Asp: listitem value = "4"> 4 </ASP: listitem>
</ASP: dropdownlist>

<P>
<Asp: checkbox id = "check1" text = "Hide panel" runat = "server"/>

<P>
<Asp: button text = "Refresh panel" runat = "server"/>


</Form>

</Body>
</Html>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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