checkbox - TriCheckbox in form? -


i'm trying make form allows tricheckboxes.

for example, starts out blank, when click it, gets ticked, if click again becomes cross, , if click final time, becomes blank again.

i've played around javascript , classes , managed graphics working, how tricheckbox work in php form?

i'm not sure if there better way, can add <input type="hidden" ... /> field , set value in click event handler.


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