Disable the option of the 2nd select box if selected

Question

I have two select boxes, using select2 js plugin. Both the drop-downs have the same options. I want to disable option selected in the 2nd select box if it's selected on the first one and vice versa.

Here is the code:

 jQuery(document).ready(function() { jQuery('.minimal').select2(); }); 

 <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet"/> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script> <select class="minimal" name="coin1"> <option value="btc">btc</option> <option value="usd">usd</option> <option value="eth">eth</option> </select> <select class="minimal" name="coin2"> <option value="btc">btc</option> <option value="usd">usd</option> <option value="eth">eth</option> </select> 

Answer 1

I dived into the documentation and this should do the trick:

It's one function for both selects and it uses the name attribute to differ.

 jQuery(document).ready(function() { jQuery('.minimal').select2(); }); $('select.minimal').on('select2:select', function(e) { let elem; elem = ($(this).attr("name") == "coin1") ? 2 : 1; //set the elementIndex //reset $('select[name="coin' + elem + '"] > option').removeAttr("disabled"); $('select[name="coin' + elem + '"]').select2(); const value = $(this).select2('data')[0].text; //select the value $('select[name="coin' + elem + '"] > option[value="' + value + '"]').attr("disabled", true); }); 

 <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script> <select class="minimal" name="coin1"> <option value="btc">btc</option> <option value="usd">usd</option> <option value="eth">eth</option> </select> <select class="minimal" name="coin2"> <option value="btc">btc</option> <option value="usd">usd</option> <option value="eth">eth</option> </select> 

Answer 2

See code comments below:

$(document).ready(function() {
  $('.minimal')
    .select2()
    .change(function() {                      // when changed
      let val = $(this).val();                // save the current value
      $('.minimal').not(this).find('option')  // grab options from other select
        .prop('disabled', function() {        // disable those equal to current value
          return $(this).val() == val;
        })
        .select2();                           // re-establish select2
    });
});

 $(document).ready(function() { $('.minimal') .select2() .change(function() { let val = $(this).val(); $('.minimal').not(this).find('option').prop('disabled', function() { return $(this).val() == val; }).select2(); }); }); 

 <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet"/> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script> <select class="minimal" name="coin1"> <option value="btc">btc</option> <option value="usd">usd</option> <option value="eth">eth</option> </select> <select class="minimal" name="coin2"> <option value="btc">btc</option> <option value="usd">usd</option> <option value="eth">eth</option> </select>