How can I check whether a option already exist in

Question

How can I check whether a option already exist in select by JQuery?

I want to dynamically add options into select and so I need to check whether the option is already exist to prevent duplication.

Answer 1

Does not work, you have to do this:

if ( $("#your_select_id option[value='enter_value_here']").length == 0 ){
  alert("option doesn't exist!");
}

Answer 2

This evaluates to true if it already exists:

$("#yourSelect option[value='yourValue']").length > 0;

Answer 3

I had a similar issue. Rather than run the search through the dom every time though the loop for the select control I saved the jquery select element in a variable and did this:

function isValueInSelect($select, data_value){
    return $($select).children('option').map(function(index, opt){
        return opt.value;
    }).get().includes(data_value);
}

Answer 4

var exists = $("#yourSelect option")
               .filter(function (i, o) { return o.value === yourValue; })
               .length > 0;

This has the advantage of automatically escaping the value for you, which makes random quotes in the text much easier to deal with.

Answer 5

Another way using jQuery:

var exists = false; 
$('#yourSelect  option').each(function(){
  if (this.value == yourValue) {
    exists = true;
  }
});

Answer 6

if ( $("#your_select_id option[value=<enter_value_here>]").length == 0 ){
  alert("option doesn't exist!");
}