javascript - How to create a function containing custom var -

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i have written following function sync input fields:

$(".dp1").on('change', function(e){     var datevalue = $($(this)[0]).val();     $.each($('.dp1'), function(index, item){         $(item).val(datevalue);     }); });  $(".dp2").on('change', function(e){     var datevalue = $($(this)[0]).val();     $.each($('.dp2'), function(index, item){         $(item).val(datevalue);     }); });  $(".rooms").on('keyup', function(e){     var datevalue = $($(this)[0]).val();     $.each($('.rooms'), function(index, item){         $(item).val(datevalue);     }); });  $(".persons").on('keyup', function(e){     var datevalue = $($(this)[0]).val();     $.each($('.persons'), function(index, item){         $(item).val(datevalue);     }); });

as function exact same 1 every time, guess there better way combine one. thinking of like

my_custom_function(my_custom_value){    var datevalue = $($(this)[0]).val();    $.each($('my_custom_value'), function(index, item){        $(item).val(datevalue);    }); } my_custom_function('.dp1, .dp2, .rooms, .persons');

i know there way not know how achieve this. thankful if able me out!

you can write common function , call function approprite parameters.

function my_custom_function(selector, event) {      $(selector).on(event, function (e) {          var datevalue = this.value;          $.each($(selector), function (index, item) {              $(item).val(datevalue);              console.log(item);          });      });  }    my_custom_function(".dp1", "change")    my_custom_function(".dp2", "change")    my_custom_function(".rooms", "keyup")    my_custom_function(".persons", "keyup")
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <input type="text" class="dp1"></input>  <input type="text" class="dp1"></input>  <br/>  <input type="text" class="dp2"></input>  <input type="text" class="dp2"></input>  <br/>  <input type="text" class="rooms"></input>  <input type="text" class="rooms"></input>  <br/>  <input type="text" class="persons"></input>  <input type="text" class="persons"></input>

demo : http://jsfiddle.net/kishoresahas/49fn1jhk/1/


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