ComboBox has next client side events: 

Client-side event	Description
onBeforeChange	Occurs when selected item is about to be changed.
onChange	Occurs when selected item is changed.
onItemsRequested	Occurs when items is already requested from server
onItemsRequesting	Occurs when items is needed to request from server

Also ComboBox has some client-side API functions to easily manipulate with control and its value without postback.

Client-side API functions list:

Function name	Description
al_ComboBox_SetEnable(clientID, isEnable)	Enables or disables the control with given identifier clientID, new state sets with isEnable value
al_ComboBox_IsEnabled(clientID)	Returns is the control enabled or not.
al_ComboBox_SetVisible(clientID, isVisible)	Shows or hides the control with identifier clientID, new state depends on isVisible value
al_ComboBox_IsVisible(clientID)	Returns is the control visible or not.
al_ComboBox_SetValue(clientID, value)	Sets the control's selected value.
al_ComboBox_GetValue(clientID)	Gets the control's value. If the item has not value the function return item's text.
al_ComboBox_SetText(clientID, value)	Sets the control's selected text.
al_ComboBox_GetText(clientID)	Gets the control's text.
al_ComboBox_SetSelectedIndex(clientID, itemIndex)	Sets the new control selected item index
al_ComboBox_GetSelectedIndex(clientID)	Gets the control selected item index

Example:

<cc1:ComboBox ID="ComboBox1" runat="server"></cc1:ComboBox>

<input id="btn1" onclick="al_ComboBox_SetEnable('ComboBox1', false);" type="button" value="Disable ComboBox" />

<input id="btn2" onclick="al_ComboBox_SetEnable('ComboBox1', true);" type="button" value="Enable ComboBox" />

<input id="btn2" onclick="al_ComboBox_SetVisible('ComboBox1', true);" type="button" value="Show ComboBox" />

<input id="btn2" onclick="al_ComboBox_SetVisible('ComboBox1', false);" type="button" value="Hide ComboBox" />

<input id="btn2" onclick="al_ComboBox_SetValue('ComboBox1', '2');" type="button" value="Set ComboBox value to '2'" />

<input id="btn2" onclick="alert(al_ComboBox_GetValue('ComboBox1'));" type="button" value="Get ComboBox color" />

Controls: ComboBox

 

 

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