Appending an Array of strings is giving me objects instead of strings separated with commas, my code and results are as below

Question

Hi I have stored an Array of strings into a state object, when I am trying to retrieve it as appended string, it is giving me appended objects as below, my code is as below and I am getting the result as below:

    handleDownload = (e) => {
        e.preventDefault();

        var formData = new FormData();
        formData.append('communityname', this.state.selectedCommunity);
        formData.append('files', this.state['files']);

        alert(this.state['files'].join(','));
        let url = clientConfiguration['filesApi.local'];

        axios({
            method: 'post',
            url: url,
            data:  formData
        });
    }
My Results are coming as below:

[object Object],[object Object],[object Object],[object Object]

Any help would be very much appreciated - thanks in advance

This has nothing to do with react

Dupocas
– Dupocas

2019-10-14 16:35:30 +00:00
Commented Oct 14, 2019 at 16:35 — Dupocas
– Dupocas, Commented Oct 14, 2019 at 16:35

Jonathan Irvin · Accepted Answer · 2019-10-14 17:02:16Z

1

You can stringify it so that you can properly read the values. Try this:

alert(JSON.stringify(this.state['files']));

The JSON.stringify() method converts a JavaScript object or value to a JSON string. In your case, it will convert the array of objects to JSON.

edited Oct 14, 2019 at 17:02

answered Oct 14, 2019 at 16:38

Jonathan Irvin

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4 Comments

Abdul Over a year ago

Thank you it did work, but just asking, is there anyway I can just post Array as it is to the Api, instead of converting them into json.stringify, I would like that, if there is any. Can you please suggest me something buddy. And thanks a lot and much appreciated for the earlier help - thank you from the heart.

Jonathan Irvin Over a year ago

Since you are posting an array of objects, you really want to be sending JSON instead of the actual array. You will just need to make sure your server knows how to handle it. A lot of backend languages and frameworks will handle it for you automatically, and will know exactly what to do with the JSON data that you sent.

Jonathan Irvin Over a year ago

I'm glad my original answer on JSON.stringify() helped you! If you don't mind, could you vote it up and mark it as the correct answer? That would be awesome. Hope you have a great day!

Abdul Over a year ago

Yes I did, you too my friend

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