Compare values from each JS

Question

I have this each() which collects all checked checkboxes with parameter data-is-rate = 1

 $('input[data-is-rate="1"]:checked').each(function(){
     console.log($(this).attr('data-id'));
 });

From this, I'm getting every data-id

111
222
333

So is there any way to compare them? The IDs are not unique and can be the same and I need to check.

So if data-id recurs, it should return an error.

For example, if the output is like this, it should return an error.

111
222
111

If the output is like this, there should be no error because the values are unique

111
222
333

How can I compare these?

caramba · Accepted Answer · 2020-02-23 18:34:02Z

something like this maybe helps, when error do what ever needs to be done...

var ids = [];
$('input[data-is-rate="1"]:checked').each(function(){
  console.log($(this).attr('data-id'));
  
  if(ids.includes($(this).attr('data-id'))) {
      console.log(' E R R O R !');
  }
  
  ids.push($(this).attr('data-id'));
  
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input data-is-rate="1" type="checkbox" data-id="111" checked="checked">111
<input data-is-rate="1" type="checkbox" data-id="111" checked="checked">111
<input data-is-rate="1" type="checkbox" data-id="222" checked="checked">222
<input data-is-rate="1" type="checkbox" data-id="333" checked="checked">333

if data-id="111" is not checked twice there is no error

var ids = [];
$('input[data-is-rate="1"]:checked').each(function(){
  console.log($(this).attr('data-id'));
  
  if(ids.includes($(this).attr('data-id'))) {
      console.log(' E R R O R !');
  }
  
  ids.push($(this).attr('data-id'));
  
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input data-is-rate="1" type="checkbox" data-id="111" checked="checked">111
<input data-is-rate="1" type="checkbox" data-id="111" >111
<input data-is-rate="1" type="checkbox" data-id="222" checked="checked">222
<input data-is-rate="1" type="checkbox" data-id="333" checked="checked">333

Abito Prakash · Accepted Answer · 2020-02-23 18:34:28Z

1

You can try something like this

var unique = {};
$('input[data-is-rate="1"]:checked').each(function(){
    if (unique[$(this).attr('data-id')]) {
        // Duplicate data-id, handle error
        alert('Duplicate data-id' + $(this).attr('data-id'));
    } else {
        unique[$(this).attr('data-id')] = 1;
    }
});

answered Feb 23, 2020 at 18:34

Abito Prakash

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