Question

when i’m iterating a collection of inputs, how can I get the current radio index if the input is part of a group of radios?

$('input').each(function(){

  if($(this).is(':radio')){
    // here get the index of the radio in the radio group,
    // like 1, 2, 3 etc... 
  }


});

The index should be relative to the radio group, no the entire collection of input elements.

The group is determined by the input name (inputs having the same name).

Answer 1

To find the position of the radio within the group defined by the radio‘s name attribute:

$('input:radio').each(
    function(){
        console.log($(this).index('[name="' + this.name + '"]'));
    });​

JS Fiddle proof of concept.

References:

• .index().
• :radio selector.