How to detect selected option in datalist when has duplicate option?

Question

I have a input type text with datalist that contains duplicate option values

<input type="text" id="my-input" list="data-list">
<datalist id="data-list">
   <option value="John" data-id="1"></option>
   <option value="George" data-id="2"></option>
   <option value="John" data-id="3"></option>
</datalist>

What options i have to get the data-id when i select option. For example if i select the the second John to get 3 as id. I just found this:

$("#data-list option[value='" + $('#my-input').val() + "']").attr('data-id');

but if i chose the second john it returns 1 as id, whitch is incorrect.

Answer 1

You can add an index to duplicate option in datalist. So you should loop through options and in loop select any option in datalist has same value and add index to value attribute of it.

$("datalist option").each(function(){
  var sameOpt = $(this).parent().find("[value='"+this.value+"']:gt(0)");
  sameOpt.val(function(i, val){
    return val+'-'+(sameOpt.index(this)+2);
  }); 
});

$("datalist option").each(function(){
  var sameOpt = $(this).parent().find("[value='"+this.value+"']:gt(0)");
  sameOpt.val(function(i, val){
    return val+'-'+(sameOpt.index(this)+2);
  }); 
});

$("#my-input").change(function(){
  var v = $("#data-list option[value='"+this.value+"']").attr('data-id');
  console.log(v);
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="my-input" list="data-list">
<datalist id="data-list">
  <option value="John" data-id="1"></option>
  <option value="George" data-id="2"></option>
  <option value="John" data-id="3"></option>
  <option value="George" data-id="4"></option>
  <option value="John" data-id="5"></option>
</datalist>