Input element in javascript

How to set the size or width of an input element in javascript.

I am using input_obj.size= '40%'开发者_JAVA百科;

But, it is not working.

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You set the size as per your own example — but it doesn't take a CSS length. It takes an integer (number of characters).

The width is set as per any other element: input_obj.style.width.

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You should use style attribute:

  input_obj.style.width = '40%';

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If input_obj is your input obj (which I assume according to the name ;))

input_obj.style.width = '100px';