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Editorial Team
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Asked: 2026-06-04T19:49:21+00:00

I am trying to get a user’s thumbnail from another intranet site but some

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I am trying to get a user’s thumbnail from another intranet site but some of them do not follow the pre-defined format meaning I would want to load up a default thumbnail instead.

Whats the best way to check if an image URL is valid?

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1 Answer

  1. Editorial Team

    Depending on how you are getting your images a variation of this might work

    <html>
    <body>
        <img src="<dynamic handler url>" alt="My Username" onError="this.src='defaultProfile.jpg';" />
    </body>
</html>

    This is how you would do it in ASP.NET.

    Designer –

    <asp:Image ImageUrl="NonexistentImage.Jpg" ID="profileImage" Height="50" Width="50" runat=server />

    Code Behind (c#)

    profileImage.Attributes["onerror"] = "this.src='http://www.cs.uofs.edu/~olivetoj2/blah.jpg';";

    This works perfectly for me.

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