changing textbox border colour using javascript

Question

I m doing form validation  when the form input is incorrect i add a red border to the textbox   document getElementById  fName   style borderColor   FF0000    this then gives me a 2px red border  what i want to do is if the user putas in a correct value to go back to the original border      can someone tell me how i change the border size and colour in javascript

User · Answer

Add an onchange event to your input element    lt input type  text  id  fName  value    onchange  fName Changed this     gt    Javascript   function fName Changed fName        fName style borderColor    fName value     correct text       FF0000     fName style borderColor

User · Answer

document getElementById  fName   style border  1px solid black

User · Answer

I m agree with Vicente Plata you should try using jQuery IMHO is the best javascript library  You can create a class in your CSS file and just do the following with jquery       fName   addClass  name of the class       and that s all  and of course you won t be worried about incompatibility of the browsers  that s jquery s team problem  D LOL

User · Answer

If the users enter an incorrect value  apply a 1px red color border to the input field   document getElementById  fName   style border   1px solid red     If the user enters a correct value  remove the border from the input field   document getElementById  fName   style border

User · Answer

Use CSS styles with CSS Classes instead  CSS   error     border 2px solid red      Now in Javascript  document getElementById  fName   className   document getElementById  fName   className     error       this adds the error class  document getElementById  fName   className   document getElementById  fName   className replace   error           this removes the error class   The main reason I mention this is suppose you want to change the color of the errored element s border   If you choose your way you will may need to modify many places in code   If you choose my way you can simply edit the style sheet

User · Answer

document getElementById  fName   style borderColor      is all you need to change the border color back   To change the border size  use element style borderWidth    1px

User · Answer

You may try  document getElementById  name   style borderColor   e52213   document getElementById  name   style border  solid

[javascript] changing textbox border colour using javascript

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