jquery - Count duplicates within observableArray and Display them -


i have observable array following data

["volkswagen",  "toyota",  "volkswagen",  "toyota",  "audi",  "volkswagen",  "toyota",  "audi"]

i know how can count duplicate values , display them within select box. like:

volkswagen (3) audi (2) toyota (3)

what best way achieve this?

i'd use straightforward computed:

viewmodel.collapsedmakes = ko.computed({   pure: true,   owner: viewmodel,   read: function() {     var makes = {}, rv;     // use object count them     this.makes().foreach(function(make) {       if (makes[make]) {         ++makes[make];       } else {         makes[make] = 1;       }     });      // build array     rv = object.keys(makes).sort().map(function(make) {       return make + " (" + makes[make] + ")";     });     return rv;   } });

live example:

var viewmodel = {    makes: ko.observablearray([      "volkswagen",      "toyota",      "volkswagen",      "toyota",      "audi",      "volkswagen",      "toyota",      "audi"    ])  };    viewmodel.collapsedmakes = ko.computed({    pure: true,    owner: viewmodel,    read: function() {      var makes = {}, rv;      // use object count them      this.makes().foreach(function(make) {        if (makes[make]) {          ++makes[make];        } else {          makes[make] = 1;        }      });        // build array      rv = object.keys(makes).sort().map(function(make) {        return make + " (" + makes[make] + ")";      });      return rv;    }  });    ko.applybindings(viewmodel, document.body);
<select data-bind="options: collapsedmakes"></select>  <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>


Comments

Post a Comment

Popular posts from this blog

jquery - How do you format the date used in the popover widget title of FullCalendar? -

Image
in fullcalendar, how format date used in popover widget title when clicking '+n more'? code: <div class="fc-popover fc-more-popover"> <div class="fc-header fc-widget-header"> <span class="fc-close fc-icon fc-icon-x"></span> <span class="fc-title">tuesday, april 7</span> ... </div> ... </div> you use daypopoverformat that. determines date format of title of popover created eventlimitclick option. must date formatting string. default value "dddd, mmmm d" english , "ll" other languages.
Read more

asp.net mvc - SSO between MVCForum and Umbraco7 -

i need integrate sso between mvcforum (forum of company) , umbraco7 (manages cms company). however struggling shared authentication work. tried several ways suggested on other threads still not running expected. here did: 1. in mvcforum (forum.mywebsite.com) 1.1. machine key in web.xml: <machinekey validationkey="the same key umbraco7" decryptionkey="the same key umbraco7" validation="sha1" decryption="aes" /> 1.2. authenticate forms in web.xml <forms name="my-sso-auth" protection="all" path="/" timeout="43200" domain="forum.mywebsite.com" loginurl="/members/logon" enablecrossappredirects="true" /> 2. in umbraco7 (news.mywebsite.com) 2.1. machine key in web.xml: <machinekey validationkey="the same key mvcforum" decryptionkey="the same key mvcforum" validation="sha1" decryption="aes" /> 2.2. a...
Read more

Python Tkinter keyboard using bind -

i have problem using bind option can click button in keyboard, , call function once key pressed. tried taking other codes have similar purpose , saw i'm doing pretty same, though still have problem must've missed. thankful if me this. here's code: # -*- coding: utf-8 -*- #imports tkinter import * pil import imagetk, image import time import tkmessagebox #===========================================================================================================================================# #tkinter class class app(frame): def __init__(self, master=none): frame.__init__(self, master) self.pack() #===========================================================================================================================================# #game pieces classes class board: def __init__(self, rows = 7, columns = 6, picture_height = none, picture_width = none): self.rows = rows self.columns = columns self.picture ...
Read more