javascript - If field empty set border to red -


after click on button set border around text field red.

name <input type="text" class="one" id="name">  <input type="button" value="ok" >

i know style border 

.one { border-style:solid; border-color:#0000ff; }

i want set border red if field name empty after click on button. can make php or must use java script , event on click ??

you have use javascript that. should call javascript function upon click text box , add class when button clicked hence applying css when class added javascript. have in function check if text box empty add class else skip.


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