HtmlSelect Control

Definition and Usage

The HtmlSelect control is used to control a <select> element. In HTML, the <select> element is used to create a drop-down list.

Properties and Events

Property	Description
DataMember	A name of a data table to use
DataSource	A data source to use
DataTextField	A field in the data source to be displayed in the drop-down list
DataValueField	A field in the data source that specifies the value of each selectable item in the drop-down list
id	A unique id for the control
InnerHtml	The HTML content of this element
InnerText	The text-only content of this element
Items	The list of items in the drop-down list
Multiple	Whether multiple items can be selected at a time
OnServerChange	The name of the function to be executed when the selected item has changed
runat	Specifies that the control is a server control. Must be set to "server"
SelectedIndex	The index of the currently selected item
Size	The number of visible items in the drop-down list
Value	The value of the currently selected item

Example 1

In the following example we declare an HtmlImage and an HTMLSelect control in an .aspx file (remember to embed the controls inside an HtmlForm control). Then we modify the src property of the HtmlImage control based on user choices. The value selected in the HtmlSelect control determines which image to display:

<script runat="server">
  Sub change_image(Sender As Object, e As EventArgs)
    i1.Src = "../images/" & s1.Value
  End Sub
</script>

<html>
<body>
<form runat="server">
<img id="i1" src="../images/smiley.gif" runat="server"/>
<br />
<p>Select image:
<select id="s1" runat="server">
  <option value="smiley.gif">Smiley</option>
  <option value="angry.gif">Angry</option>
  <option value="stickman.gif">Stickman</option>
</select>
<input type="submit" runat="server" value="Show Image"
OnServerClick="change_image">
</p>
</form>
</body>
</html>

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