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Editorial Team
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Asked: 2026-05-12T01:16:57+00:00

For a <select> control, we can use the onchange attribute to run some javascript

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For a <select> control, we can use the onchange attribute to run some javascript when the option value changes. Intellisense would lead me to believe that the asp:ListBox control does not hold this attribute (as you’ll get underlining in visual studio telling you that this is invalid). However, this works. 

<asp:ListBox  ID="roleList"  OnChange="someJavascriptCall()" runat="server" Visible="true" Rows="3">

Try typing that code into visual studio, and you’ll have your OnChange attribute calling you out. Why is this? Are there any side effects to using this attribute?

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1 Answer

  1. Editorial Team

    It’s not a valid attribute for the asp:Listbox control but it is a valid one for the html select control. Intellisense is just warning you about the former.

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