How to use <button> tags within MyBB forms?

[Destro]

Hello.

I've some trouble in using <button> tags within MyBB forms.

For example :

PHP Code:

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<form action="newthread.phpXXXX"> ... <button name="submit" type="submit"> <span>Post Thread</span> </button> <button name="previewpost" type="submit"> <span>Preview Post</span> </button> ... </form>

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And you will know what happen When click  to the Preview button, it will do post thread process

I don't know which file where I can handle the preview process in MyBB. I found in the "newthread.php"

Code:

$mybb->input['action'] == "previewpost"

---

But I don't know what it do exactly...


Thanks for your reading.