Discussion on: FormData in TypeScript

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Replies for: That's what I couldn't get working. The above code was not accepted by the TS compiler, complaining that there is no such property entries. edit:...

Hmm, that is odd. I saw a TS issue related to this, github.com/Microsoft/TypeScript/is.... Someone suggested using Array.from() to mitigate this.

e.g.

form.onsubmit = (event) => {
    const data = new FormData(form);
    const pairs = Array.from(data.entries());
    for (let pair of pairs) {
        console.log(pair);
    }
};

Ben Lovy • Nov 8 '18

Interesting - thank you for the issue link, I'll give it a whirl when I get back to my computer. I missed that one when searching it myself.

In that conversation, though, they mention needing to use a target < es2015 - I did try doing that instead to no avail. If Array.from() solves the issue, though, it's a small price to pay, I don't think it's any less readable.

Ben Lovy • Nov 8 '18

Ah - another comment in that thread had the fix. You need to add "dom.iterable" to your libs in tsconfig - I'll update the post. Thank you thank you!

Forest Hoffman • Nov 8 '18

My pleasure! Glad it's fixed 😀