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Set data of a Multiple Select2 element through javascript

I'm loading multiple values into a Select2 element through Javascript, ajax and jquery. While the data is loading properly and can be accessed once loaded, I'm unable to set stored data in the Select2 element.
Edit: I'm using Select2 v3.5.
My code:
HTML:
<input class="jsData" style="width: 100%" id="select2Data"></input>
Javascript:
$(".jsData").select2({
ajax: {
minimumInputLength: 4,
contentType: 'application/json',
url: '<%=Url.Action("GetData","Controller")%>',
type: 'POST',
dataType: 'json',
data: function (term) {
return {
sSearchTerm: term
};
},
results: function (data) {
return {
results: $.map(JSON.parse(data), function (item) {
return {
text: item.term,
slug: item.slug,
id: item.Id
}
})
};
}
},
multiple: true
});
So, this creates a Select2 element where I can traverse to and from a database and load data depending on what I've typed. I can also access the data (entered by the user) using the following line:
$('.jsData').select2('val')
The above line returns an array, which I can store in the database. My current objective is to set the stored data back into the Select2 element. Any help in this matter would be most welcome.
Update: A relevant link for what I want to accomplish:
https://select2.github.io/examples.html#programmatic
I want the example of setting multiple elements in Select2. However, the difference would be in the fact that the example in the Select2 documentation brings data at the time of loading the page, while I will be making trips to fetch the data.

The Select2 v3.5.4 docs are a bit confusing around this. I think there's a typo in the docs that's misleading.
First, notice that when I retrieve the data from the remote source I'm returning it as an object in the format of {id: ##, name: NAME}.
The first step is to add the initSelection parameter and pass the function to retrieve the previously selected items.
The next step, where I believe there's a typo, is to define the formatSelection parameter (not the formatResult it states in the docs). This function defines how the previously selected result is displayed. In this case I'm merely showing the name property of the result.
The formatResult parameter defines how newly selected options are displayed. You'll notice formatResult and formatSelection are the same below. I could have reused a single function but felt this was better for demonstration.
$(document).ready(function() {
function formatResult(data) {
return data.name;
};
function formatSelection(data) {
return data.name;
}
$(".jsData").select2({
ajax: {
minimumInputLength: 4,
url: "https://jsonplaceholder.typicode.com/users",
type: "GET",
dataType: "json",
results: function(data) {
return {
results: $.map(data, function(user) {
return {
name: user.name,
id: user.id
};
})
};
}
},
initSelection: function(element, callback) {
var id = $(element).val();
if (id !== "") {
$.ajax("https://jsonplaceholder.typicode.com/users/" + id, {
dataType: "json"
}).done(function(data) {
callback(data);
});
}
},
formatResult: formatResult,
formatSelection: formatSelection,
multiple: true
});
});
Here's the full working example:
$(document).ready(function() {
function formatResult(data) {
return data.name;
};
function formatSelection(data) {
return data.name;
}
$(".jsData").select2({
ajax: {
minimumInputLength: 4,
url: "https://jsonplaceholder.typicode.com/users",
type: "GET",
dataType: "json",
results: function(data) {
return {
results: $.map(data, function(user) {
return {
name: user.name,
id: user.id
};
})
};
}
},
initSelection: function(element, callback) {
var id = $(element).val();
if (id !== "") {
$.ajax("https://jsonplaceholder.typicode.com/users/" + id, {
dataType: "json"
}).done(function(data) {
callback(data);
});
}
},
formatResult: formatResult,
formatSelection: formatSelection,
multiple: true
});
});
.jsData {
width: 200px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.4/select2.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.4/select2.css" rel="stylesheet"/>
<input class="jsData" style="width: 100%" id="select2Data" value="10"></input>

how to display more than one result data in select2 using ajax?

i am trying to display some field data from table mysql into the select2 option but whatever i do it still shows me only one.
This is how I expected: Screenshot
Any suggestions? Thanks
in javascript file I have this code
<script type="text/javascript">
//List ajax for list product
$(".js-productList").select2({
ajax: {
url: "halaman/hal_search2ajax/productsList.php",
type: "post",
dataType: 'json',
delay: 250,
data: function (params) {
return {
q: params.term, // search term
};
},
processResults: function(data){
return { results: data };
},
cache: true
},
minimumInputLength: 3,
});
</script>
my code in html
<select name='item' class=\"js-productList form-control\" required></select>
Code in productList.php
<?php
// connect to database
require('../../config/koneksi.php');
$q = $_POST['q'];
$sql = mysql_query("select id_item as id, item_name as text, item_code as code from item where item_name like '%".$q."%'");
$num = mysql_num_rows($sql);
if($num > 0){
while($data = mysql_fetch_assoc($sql)){
//I want to show the item_name and item_code
$tmp[] = $data;
}
} else $tmp = array();
echo json_encode($tmp);
?>

Something like this. Seems to be the typical parse json.
I prefer tu use $.post:
<select name='item' id="itemselect" class=\"js-productList form-control\" required></select>
var data = {
q: params.term // or the way you obtain them
}
$.post('halaman/hal_search2ajax/productsList.php', data, function(response) {
$.each(response,function(i,item){
$('#itemselect').append($('<option>', {
value: item.code,
text : item.code
}));
}
}, 'json');
with append it understand what goes into value and the text
<option value="'+value+'">'+text+'</option>

You just need to manipulate response return by ajax call using map() function
try like this
$(".js-productList").select2({
ajax: {
url: "halaman/hal_search2ajax/productsList.php",
type: "post",
dataType: 'json',
delay: 250,
data: function (params) {
return {
q: params.term, // search term
};
},
processResults: function(data){
output = $.map(data, function (obj) {
obj.text = obj.text + "-" + obj.code
return obj;
});
return { results: output };
},
cache: true
},
minimumInputLength: 3,
});
Here is working example https://jsfiddle.net/6tzkLtvL/2/
I hope it will help you.

set data attributes with ajax and select2

I'm trying setup data attributes into select2 options but without success, at this moment i have the following JS code
_properties.$localElement.select2({
ajax: {
url: "url",
type: "POST",
dataType: 'json',
delay: 250,
data: function (params) {
return {
name: params.term, // search term
type: 1
};
},
processResults: function (data) {
return {
results: $.map(data, function (item) {
return {
text: item.name,
source: item.source,
id: item.id
}
})
};
},
cache: true
},
//define min input length
minimumInputLength: 3,
});
And i want setup a data-source for the selected option value.

I find the solution, looks that resultTemplate dont format the "visual" selected option , need to use templateSelection option:
templateSelection: function(container) {
$(container.element).attr("data-source", container.source);
return container.text;
}

I solved this problem.
$('select').on('select2:select', function (e) {
var data = e.params.data;
$("select option[value=" + data.id + "]").data('source', data.source);
$("select").trigger('change');
});

You can actually use the exact syntax, that you already used. The "source-attribute" just needs to be accessed via data().data.source of the specific select2-option.
So keep your processResults function like you did:
processResults: function (data) {
return {
results: $.map(data, function (item) {
return {
text: item.name,
source: item.source,
id: item.id
}
})
};
},
and if you want to retrieve the source of the selected option, you can do it like this:
var selectedSelect2OptionSource = $("#idOfTheSelect2 :selected").data().data.source;
In fact you can set any variable you want in your processResults function and then select it via data().data.variableName!

Angular-UI Select2 directive Search functionality not working

I'm using the angular-ui select2 directive. I know it's now deprecated but my application is using this directive throughout and there is an improvement I want to make.Soon, we will migrate to the new ui=select alternative.
I'm loading the json data via an ajax call as per the example here http://select2.github.io/select2/. The data is loading correctly and can be selected, however I cannot search and narrow down/filter the results. From what i understand this is supported in the directive. when i type something, the data refreshes but doesn't filter according to the search terms. below is my code
<input type="text" id="users" ui-select2="filters.select2Test" ng-model="filters.model.users"
data-placeholder="Pick a user" ng-required="true" style="width: 300px" />
$scope.filters = {
select2Test: {
id: function(user) {
return user.code;
},
minimumInputLength: 3,
multiple: true,
ajax: {
url: 'api/employee', //This URL points to an internal location and wouldn't work
dataType: 'json',
data: function (params) {
return {
q: params.term, // search term
page: params.page
};
},
results: function(data, page) {
return { results: data };
}
},
formatResult: function(data) {
return "<div class='select2-user-result'>" + data.name + "</div>";
},
formatSelection: function(data) {
return data.name;
},
initSelection: function(element, callback) {
var data = [];
$(element.val().split(",")).each(function(i) {
var item = this.split(':');
data.push({
id: item[0],
title: item[1]
});
});
callback(data);
}
}
}

A matcher needs to be added in your select2 options:
select2Test: {
...
matcher: function(term, text, option) {
return option.name.includes(term);
},
...
}

Another way to load remote data in Select2

I'm trying to get the remote using json from one php page,the JSON data:
[{"id":"0","name":"ABC"},{"id":"1","name":"DEF I"},{"id":"2","name":"GHI"}]
and the script is like this:
$(document).ready(function() {
$('#test').select2({
minimumInputLength: 1,
placeholder: 'Search',
ajax: {
dataType: "json",
url: "subject/data_json.php",
data: function (term, page) {// page is the one-based page number tracked by Select2
return {
college: "ABC", //search term
term: term
};
},
type: 'GET',
results: function (data) {
return {results: data};
}
},
formatResult: function(data) {
return "<div class='select2-user-result'>" + data.name + "</div>";
},
formatSelection: function(data) {
return data.name;
},
initSelection : function (element, callback) {
var elementText = $(element).attr('data-init-text');
callback({"name":elementText});
}
});
});
It works fine but it always reads the database whenever I typed one new character to search
. So i decided to use the another way (retrieve all data at first time and use select2 to search it):
$(document).ready(function() {
$("#test").select2({
createSearchChoice:function(term, data) {
if ($(data).filter(function() {
return this.text.localeCompare(term)===0; }).length===0) {
return {id:term, text:term};}
},
multiple: false,
data: [{"id":"0","text":"ABC"},{"id":"1","text":"DEF I"},{"id":"2","text":"GHI"}]
});
});
But the problem is how can I pass a request to data_json.php and retrieve data from it?
Say
data: $.ajax({
url: "subject/data_json.php",
data: function (term, page) {// page is the one-based page number tracked by Select2
return {
college: "ABC", //search term
};
}
dataType: "json",
success: function(data){
return data
}
}
But its not working, can anyone help?
Thanks

Why did you move away from your original code?
minimumInputLength: 1
Increase this and the search won't be called on the first character typed. Setting it to 3 for example will ensure the ajax call isn't made (and the database therefore not queried) until after the 3rd character is entered.

if I understood your question correctly you have data_json.php generating the options for select2 and you would like to load all of them once instead of having select2 run an ajax query each time the user inputs one or more characters in the search.
This is how I solved it in a similar case.
HTML:
<span id="mySelect"></span>
Javascript:
$(document).ready(function () {
$.ajax('/path/to/data_json.php', {
error: function (xhr, status, error) {
console.log(error);
},
success: function (response, status, xhr) {
$("#mySelect").select2({
data: response
});
}
});
});
I've found that the above does not work if you create a <select> element instead of a <span>.