javascript - how to check audio tag load file complete -

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i play audio file using audio tag in html 5 duration of file 20 second. when open page, duration of audio tag 14 second. refresh page. can see duration change 14 sec or 20 sec. don't know why. , when file not loaded completely, can't control player. click play bar, not control

in other case, file load completely, can control currenttime , play(). file not loaded completely, can use play file 1 time, not control it

how sure file load always?

you may check using 'onloadeddata', add listener

<audio onloadeddata="dothisonload()"> </audio>

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