Question

If a form has same tag repeatedly,
how to get its value in JavaScript?

    <script>
     function validate()
      {
        //get all values of elmone
      }
     </script>


<form>
<input type="text" size="15" value="Hello World" name="elmOne">
<input type="text" size="15" value="next Hello World" name="elmOne">
 <input type="button" onclick="javascript:validate()" value="validate">
</form> 

Answer 1

it is not a common practice to name two different text input element with a common name. However, back to the question, you can always use document.getElementByName(‘elmOne’); to get a list of the matching input, then loop through it for value

var input_list = document.getElementsByName('elmOne');

for(var i = 0; i < input_list.length; i++) {
    // either way should get you the value
    console.debug(input_list[i].value, input_list[i].getAttribute('value'));
}

you may want to refer to this page for further information on compatibility