Develop Reference

Select2 group with Infinite scroll

I am using select2 group option with infinite scroll and data are coming by Ajax calling per page 10. Here is some problem arises, suppose user 1 has 15 data and user 2 has 15 data, at first 10 data are coming from user 1 and in next page 10 (5 data for user1 and 5 data for user2). no problem for data getting but the problem is user 1 group showing double. How can I prevent double display to my select2 options group? Has there any way to make an option group again?
HTML CODE
<div class="container">
<form id="frm">
<h1>Solution 1</h1>
<div class="row">
<div class="col-4">
<div class="form-group">
<label for="tagInput">Get data by ajax calling</label>
<select class="form-control" id="pictures_tag_input">
</select>
<small class="form-text text-muted"><p class="text-info">Infinite Scroll</p></small>
</div>
</div>
</div>
</form>
</div>
JS CODE
$(document).ready(function() {
// solution 1
//example.com/articles?page[number]=3&page[size]=1
http: $("#pictures_tag_input").select2({
placeholder: "Search for options",
ajax: {
url: "https://jsonplaceholder.typicode.com/users/1/todos",
dataType: "json",
global: false,
cache: true,
delay: 250,
minimumInputLength: 2,
data: function(params) {
// console.log(params.page || 1);
return {
q: params.term, // search term
_page: params.page || 1,
_limit: 10 // page size
};
},
processResults: function(data, params) {
params.page = params.page || 1;
var datx = getNestedChildren(data);
// console.log(datx);
return {
results: datx,
pagination: {
more: true
}
};
} //end of process results
} // end of ajax
});
function getNestedChildren(list) {
var roots = [];
for (i = 0; i < list.length; i += 1) {
node = list[i];
if (roots.length === 0) {
var obj = {
text: "User " + node.userId,
children: [{ id: node.id, text: node.title }]
};
roots.push(obj);
} else {
var obj = {
text: "User " + node.userId,
children: [{ id: node.id, text: node.title }]
};
var rootArray = $.map(roots, function(val, i) {
var vl = "User " + node.userId;
if (val.text === vl) return val;
else return undefined;
});
if (rootArray.length > 0) {
var obj1 = {
id: node.id,
text: node.title
};
rootArray[0].children.push(obj1);
} else {
roots.push(obj);
}
}
}
return roots;
}
});
Demo
https://codepen.io/mdshohelrana/pen/MLVZEG

Just try to use the following code
templateResult: function(data) {
if (typeof data.children != 'undefined') {
$(".select2-results__group").each(function() {
if (data.text == $(this).text()) {
return data.text = '';
}
});
}
return data.text;
}
NOTE: Need to group from server side, Other wise you have to make master details from client side.

the accepted answer didn't work for me and I don't see why should that work. A return in the $.each will not return from the templateResult() function.
Here is an approach that worked for me.
It is not necessary to build a nested list by getNestedChildren(list) on javascript side. It is much easier to build it on server side instead.
The appearance of search results in the dropdown (options and the optgroups) can be customized by using the templateResult option. I removed the duplicated optgroups and labels by this option.
check the templateResult: formatOptions, part of the code
$(document).ready(function() {
$("#pictures_tag_input").select2({
placeholder: "Search for options",
templateResult: formatOptions,
ajax: {
url: "https://jsonplaceholder.typicode.com/users/1/todos",
dataType: "json",
global: false,
cache: true,
delay: 250,
minimumInputLength: 2,
data: function(params) {
return {
q: params.term,
_page: params.page || 1,
_limit: 10
};
},
processResults: function(data, params) {
params.page = params.page || 1;
return {
results: data,
pagination: {
more: true
}
};
} //end of process results
} // end of ajax
});
function formatOptions(item, container, $el) {
// optgroups section
if (item.children && item.children.length > 0) {
// don't format the repeated optgroups!
if ($(".select2-results__group").text() === item.text) {
return;
}
if ($('[aria-label="' + item.text + '"]').length > 0) {
return;
}
// the first occasion of the given optgroup
return $el;
}
// options section
// here you can implement your own logic
// if you want to customise the output of the options
$el.addClass('something-special-result result');
return $el;
}
});

maybe the problem is a source of a data
You call user 1 .... server return a 1
You call user 2 .... server return a 1
You call user 3 .... server return a 2
You call user 4 .... server return a 2
You call user 5 .... server return a 3
You call user 6 .... server return a 3
curent_user = 1;
$(document).ready(function() {
http: $("#pictures_tag_input").select2({
placeholder: "Search for options",
ajax: {
url: "https://jsonplaceholder.typicode.com/users/1/todos",
dataType: "json",
global: false,
cache: false,
minimumInputLength: 2,
data: function(params) {
console.log("params",params || 1);
return {
q: params.term, // search term
_page: curent_user,
_limit: 10 // page size
};
},
processResults: function(data, params) {
curent_user += 2;
var datx = getNestedChildren(data);
console.log("data: ", data);
return {
results: datx,
pagination: {
more: true
}
};
} //end of process results
} // end of ajax
});
function getNestedChildren(list) {
var roots = [];
for (i = 0; i < list.length; i += 1) {
node = list[i];
if (roots.length === 0) {
var obj = {
text: "User " + node.userId,
children: [{ id: node.id, text: node.title }]
};
roots.push(obj);
} else {
var obj = {
text: "User " + node.userId,
children: [{ id: node.id, text: node.title }]
};
var rootArray = $.map(roots, function(val, i) {
var vl = "User " + node.userId;
if (val.text === vl) return val;
else return undefined;
});
if (rootArray.length > 0) {
var obj1 = {
id: node.id,
text: node.title
};
rootArray[0].children.push(obj1);
} else {
roots.push(obj);
}
}
}
return roots;
}
});
so if you skip a one step
You call user 1 .... server return a 1
You call user 3 .... server return a 2
You call user 5 .... server return a 3

I just found a better solution which does not result in a (duplicated) optgroup being rendered as an empty option:
processResults: function( json, params ){
setTimeout( function() {
var $prevOptions = false;
var $prevGroup = false;
// loop
$('.select2-results__option[role="group"]').each(function(){
// vars
var $options = $(this).children('ul');
var $group = $(this).children('strong');
// compare to previous
if( $prevGroup && $prevGroup.text() === $group.text() ) {
$prevOptions.append( $options.children() );
$(this).remove();
return;
}
// update vars
$prevOptions = $options;
$prevGroup = $group;
});
}, 1 );
return json;
}
Advanced Custom Fields uses the exact same code for their WordPress plugin in order to fix this issue, ajax-load and group posts from different post-types.

How to add render and create methods to Selectize element

I have a HTML 'select' element that I want to use as 'AutoSuggest' by using Selectize.js and this is how I initialize the selectize
jQuery(ele).selectize({
//options: initData,
addPrecedence: false,
persist: false,
maxItems: 1,
create: function (input) {
return {
value: input,
text: input
};
},
render: {
option_create: function (data, escape) {
return '<div class="create"><strong>' + escape(data.input) + '</strong></div>';
}
}
});
Now, the issue is if the 'ele' is already initialized as a 'Selectize' control without the 'render' and 'create' options, how can I add these options?

I figured it out. Here is how you do this
if (ele.selectize) {
var selectizeCtrl = jQuery(ele)[0].selectize;
selectizeCtrl.settings.create = function (input) {
return {
value: input,
text: input
};
};
selectizeCtrl.settings.render.option_create = function (data, escape) {
return '<div class="create"><strong>' + escape(data.input) + '</strong></div>';
};
}

Creating minLength exception in jQueryUI autocomplete

I have a collection of data whereby the requirements are for the autocomplete to show results after 3 characters have been written. However, there is one piece of data that which is only two characters long.. ('LG').
So my question is;
Is there a way to keep :minLength:3 whilst creating an exception for when certain characters are typed, such as ('LG')?
I've been trying to hard code the result within the success parameter, as can be seen below but it's not working as intended. I'm hoping I'm on the right track though?
Here is a code snippet, and plunk of complete code thus far;
success: function (LG, resp) {
if (LG.length === 2) {
LG.push({
label: 'LG',
value: 'LG',
});
}
response(LG);
var results = [];
$.each(resp.Q0, function(k, v) {
if (v.indexOf(request.term.toUpperCase()) >= 0) {
results.push(v);
}
});
response(results);
}
});
},
https://plnkr.co/edit/wfAoi0sZDdDd0pCufQi9

I think an option is modify the minChars and modify the success function.
Here i add you the code, tell me if would suit your problem.
$(document).ready(function() {
setTimeout(function() {
$('#_Q0').autocomplete({
source: function(request, response) {
$.ajax({
url: "brands.json",
dataType: "JSON",
type: "GET",
success: function (resp) {
var results = [];
$.each(resp.Q0, function(k, v) {
if (request.term.length >= 3 && v.indexOf(request.term.toUpperCase()) >= 0) {
results.push(v);
}
if (request.term.length == 2 && request.term.toUpperCase() == v) {
results.push(v);
}
});
response(results);
}
});
},
autoFocus: true,
minLength: 2,
response: function(event, ui) {
if (!ui.content.length) {
var noResult = {
value: "",
label: "No results found"
};
ui.content.push(noResult);
}
}
});
var render = $('#_Q0').autocomplete('instance')._renderMenu;
$('#_Q0').autocomplete('instance')._renderMenu = function(ul, items) {
items.push({
label: 'AUTRE MARQUE',
value: 'AUTRE MARQUE',
last: true
});
render.call(this, ul, items);
};
}, 100);
});
The point i dont like too much is i had to hardcode the minChars into the success function, maybe we could find the way to recover the value from the property "minChars"
https://plnkr.co/edit/ygtMteIH1J5EI5KUMU3C?p=preview

Select2 limit number of tags

Is there a way to limit the number of tags a user can add to an input field using Select2?
I have:
$('#tags').select2({
containerCssClass: 'supplierTags',
placeholder: "Usual suppliers...",
minimumInputLength: 2,
multiple: true,
tokenSeparators: [",", " "],
placeholder: 'Usual suppliers...',
createSearchChoice: function(term, data) {
if ($(data).filter(function() {
return this.name.localeCompare(term) === 0;
}).length === 0) {
return {id: 0, name: term};
}
},
id: function(e) {
return e.id + ":" + e.name;
},
ajax: {
url: ROOT + 'Call',
dataType: 'json',
type: 'POST',
data: function(term, page) {
return {
call: 'Helpers->tagsHelper',
q: term
};
},
results: function(data, page) {
return {
results: data.tags
};
}
},
formatResult: formatResult,
formatSelection: formatSelection,
initSelection: function(element, callback) {
var data = [];
$(element.val().split(",")).each(function(i) {
var item = this.split(':');
data.push({
id: item[0],
name: item[1]
});
});
callback(data);
}
});
It would be great if there could be/is a simple parameter like limit: 5 and a callback to fire when the limit is reached.

Sure, with maximumSelectionLength like so:
$("#tags").select2({
maximumSelectionLength: 3
});
Maximum Selection Length
Select2 allows the developer to limit the number of items that can be
selected in a multi-select control.
http://ivaynberg.github.io/select2/
It has no native callback, but you can pass a function to formatSelectionTooBig like this:
$(function () {
$("#tags").select2({
maximumSelectionLength: 3,
formatSelectionTooBig: function (limit) {
// Callback
return 'Too many selected items';
}
});
});
http://jsfiddle.net/U98V7/
Or you could extend formatSelectionTooBig like this:
$(function () {
$.extend($.fn.select2.defaults, {
formatSelectionTooBig: function (limit) {
// Callback
return 'Too many selected items';
}
});
$("#tags").select2({
maximumSelectionLength: 3
});
});
Edit
Replaced maximumSelectionSize with the updated maximumSelectionLength. Thanks #DrewKennedy!

method 1
$("#tags").select2({
maximumSelectionLength: 3
});
method 2
<select data-maximum-selection-length="3" ></select>
list of all available options https://select2.org/configuration/options-api

The accepted answer doesn't mention that the maximumSelectionLength statement should be inside the document.ready function. So for anyone who is having the same trouble I did, here is the code that worked for me.
$(document).ready(function() {
$("#id").select2({
maximumSelectionLength: 3
});
});

$("#keywords").select2({
tags : true,
width :'100%',
tokenSeparators: [','],
maximumSelectionLength: 5,
matcher : function(term,res){
return false;
},
"language": {
'noResults': function(){
return "Type keywords separated by commas";
}
}
}).on("change",function(e){
if($(this).val().length>5){
$(this).val($(this).val().slice(0,5));
}
});
Try like this. It'll short up to 5 keywords.

This is not working for me, I am getting query function not defined for Select2, so here is another workaround.
var onlyOne=false;
$("selector").select2({
maximumSelectionSize:function(){
if(onlyOne==true)
return 1;
else
return 5;
}
});
This setting can be defined as function and it's called every time you start searching something.
Important thing is that you have something defined outside this select2 closure so you can check it (access it). In this case you could somewhere in your program change value of onlyOne and of course this returned limit can also be dynamical.

This is working for me.
$("#category_ids").select2({ maximumSelectionLength: 3 });

Send the Get Request to action method and the Map the class properties to drop down id and text property
$("#DropDownId").select2({
minimumInputLength: 3,
maximumSelectionLength: 10,
tags: [],
ajax: {
url: "#Url.Action("ActionName", "ControllerName")",
type: "get",
dataType: 'json',
delay: 250,
data: function (params) {
return {
Title: params.term // search term
};
},
processResults: function (response) {
return {
results: $.map(response, function (item) {
return {
text: item.Title,
id: item.Id
}
})
};
}
}
});
Action Method
[HttpGet]
public JsonResult ActionName(string Title)
{
ClassName obj= new ClassName ();
obj.Title = "PMPAK";
obj.Id= -1;
obj.Add(nibafInstitute);
return Json(obj, JsonRequestBehavior.AllowGet);
}
public class ClassName
{
public int Id{ get; set; }
public string Title { get; set; }
}

How to dynamically generate options for RichCombo in CKEDITOR?

There is a form on my page with textarea (CKEDITOR) and select field <select id="_photogalleries" multiple="multiple"></select>. I'd like options in RichCombo to depend on the options that are selected in select with id #_photogalleries. Is there any way to regenerate RichCombo dynamically?
Thanks in advance.
CKEDITOR.plugins.add('style_plugin', {
requires: ['richcombo'],
init: function(editor) {
var pluginName = 'style_plugin';
var config = editor.config,
lang = editor.lang.format;
editor.ui.addRichCombo('photogalleries', {
label: "Фоторепортаж",
title: "Фоторепортаж",
voiceLabel: "Фоторепортаж",
className: 'cke_format',
multiSelect: false,
icon: CKEDITOR.plugins.getPath('style_plugin') + 'photo-list-horizontal.png',
panel: {
css: [config.contentsCss, CKEDITOR.getUrl(editor.skinPath + 'editor.css')],
voiceLabel: lang.panelVoiceLabel
},
init: function () {
this.startGroup("Фоторепортаж");
var list=this;
$("#_photogalleries option:selected").each(function(index, value){
console.log(index, value);
list.add("#HORIZONTAL_GALLERY_"+ $(value).val()+"#", "(Г) " + $(value).text(), "(Г) " + $(value).text());
list.add("#VERTICAL_GALLERY_"+ $(value).val()+"#", "(В) " + $(value).text(), "(В) " + $(value).text());
});
},
onClick: function (value) {
editor.focus();
editor.fire('saveSnapshot');
editor.insertHtml(value);
editor.fire('saveSnapshot');
}
});
}
});

This works for me and you dont have to keep a global variable.
CKEDITOR.plugins.add('systemdata', {
init: function (editor) {
var fnData = editor.config.fnData;
if (!fnData || typeof (fnData) != 'function')
throw "You must provide a function to retrieve the list data.";
editor.ui.addRichCombo('systemDataCmb',
{
allowedContent: 'abbr[title]',
label: "System Data",
title: "System Data",
multiSelect: false,
init: function () {
var self = this;
var content = fnData();
$.each(content, function(index, value) {
// value, html, text
self.add(value.name, value.name, value.name)
});
}
}
Then to set the function to get the data put this somewhere where you setup the ckeditor
CKEDITOR.replaceAll(function(element, config) {
config.startupFocus = true;
config.fnData = function() {
var returnData = null;
$.ajax({
url: "/GetData",
async: false,
data: { id: 1 },
}).done(function(result) { returnData= result; });
return returnData;
};
});
It assumes you bring back a json response that has an array of items that have a value property, that can be easily changed though.

I guess I found a solution that worked for me. It was to keep a list object in a global variable and then modify it when onchange event fires in the external select.

I solved this trouble with a single line:
YOURCOMBO.createPanel(editor);
For example:
var comboTeam = editor.ui.get("team");
comboTeam.createPanel(editor);//This is important, if not, doesnt works
Now you can add items to the combo
comboTeam.add("name","name","name");
comboTeam.add("name2","name2","name2");
comboTeam.add("name3","name3","name3");