HTML/Javascript: Const already declared even though only defined once

Need help
1

Hello,

I have an iframe in which I am embedding an external website that contains a video. When the video is fully watched, it calls the function “video_completed”.

Now I have the following script:

<iframeIsDeclaredHere></iframe>

<script>


const isVideoMessage = message =>
        message.origin === "https://video.test.com" &&
        message.data &&
        message.data.type &&
        message.data.type.startsWith("va_");

Whenever I do that, it says the const has already been declared.

So I thought I will use it within a “try” block:

<iframeIsDeclaredHere></iframe>

<script>
     **try {**
const isVideoMessage = message =>
        message.origin === "https://video.test.com" &&
        message.data &&
        message.data.type &&
        message.data.type.startsWith("va");
} catch (err) {
alert('Error');
}

Then, it says the const is not declared at all.

So either I have it declared multiple times or not at all. What can I do? Thanks a lot for your help!

2

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