javascript - Twitter Bootstrap tags input doesn't remove placeholder when onfocus -

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i have been scratching head since yesterday on problem, cannot solve. new starter twitter bootstrap , going until yesterday.

i using latest jquery v1.11.1 , twitter bootstrap v3.3.1. yesterday downloaded bootstrap tags input, here: http://timschlechter.github.io/bootstrap-tagsinput/examples/

the plugin works , have changed css styles match page layout problem having placeholder attribute not disappear when on focus. if type in tag , add comma value placeholder show until start typing , disappear again.

i have tried using jquery onfocus function remove attribute when onfocus doesn't anything. want achieve when onfocus placeholder not show @ point not on blur.

my input field demonstrated below:

<input type="text" name="customer_tags" id="customer_tags" value="" placeholder="enter tags" data-role="tagsinput" required />

html5 placeholder attribute not disappear when focus in input tag... disappear when start typing. default behavior.

you can see @ w3schools well...


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