How to show alert message if iframe contains invalid source?

kevinSuttle / github

Yes, I know about https://github.com/isaacs/github

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How to show alert message if iframe contains invalid source? #56

Open sai78 opened 5 years ago

sai78 commented 5 years ago

I am trying to embed media using object tag but I found on searching it got deprecated so I went to use Iframe but I want to display an alert message if the src attribute contains invalid url. media I want to embed contains video/image/pdf/html file

I tried something like below . please help thanks in advance