Validating Duplicate Data Between ObservableArrays

Validating Duplicate Data Between ObservableArrays

By : oxybag
Date : November 20 2020, 03:01 PM
I wish this helpful for you You can accomplish this with a computed function that checks each option against the selected options in your AttrsViewModels. The computed will automatically recalculate whenever a selected option changes because they're observables, and the div text will be updated if bound to the computed function.
code :
function viewModel(){
  var self = this;
  this.optionsViewModel = [
    { ProductId: 1, ProductName: 'product 1' },
    { ProductId: 2, ProductName: 'product 2' },
    { ProductId: 3, ProductName: 'product 3' }
  this.AttrsViewModels = ko.observableArray([
    { ServiceGroup: ko.observable() },
    { ServiceGroup: ko.observable() },
    { ServiceGroup: ko.observable() }
  this.validations = ko.computed(function(){
    for(var i=0; i<self.optionsViewModel.length; i++){
    	var option = self.optionsViewModel[i];
        var matches = self.AttrsViewModels().filter(function(item){
            return item.ServiceGroup() === option.ProductId;
        if(matches.length >= 2){
      	    return option.ProductName + ' is selected more than once';
    return '';
ko.applyBindings(new viewModel());
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div id="AttrValidationDiv">
  <span data-bind="text: validations"></span>
    <!--ko foreach: AttrsViewModels-->
          <select data-bind="options:$root.optionsViewModel, optionsText:'ProductName', optionsValue:'ProductId',value:ServiceGroup, optionsCaption:'Select'"></select>

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Knockout JS - Multidimensional observableArrays and displaying sub-array data

Knockout JS - Multidimensional observableArrays and displaying sub-array data

By : miken96
Date : March 29 2020, 07:55 AM
it should still fix some issue If I understand your problem correctly and a Site contains an observableArray of Company objects and each Company object contains an observableArray of Job objects, then your approach will not work.
data-bind="text: Site().Company().Name" is trying to get the Name property of an observableArray that happens to contain Company objects. You could however write data-bind="text: Site().Company()[0].Name" to get the name of the first Company.
code :
<!-- ko with: Site -->
Site name is <span data-bind="text: Name"/>
  <!-- ko foreach: Company -->
    <li>Company name is <span data-bind="text: Name"/>
      <!-- ko foreach: Job -->
        <li>Job name is <span data-bind="text: Name"/>
      <!-- /ko -->
  <!-- /ko -->
<!-- /ko -->
Validating against duplicate user entries when using sets

Validating against duplicate user entries when using sets

By : Andrej Hudec
Date : March 29 2020, 07:55 AM
it helps some times Sets do not prohibit entering a unique value more than once. It is on you to check preconditions, see e.g Set.add.
So instead of just calling:
code :
if (!userNumbers.contains(numberChoosen)) {
} else {
    // do stuff...
Validating user input to prevent duplicate ID

Validating user input to prevent duplicate ID

By : MadBob
Date : March 29 2020, 07:55 AM
Hope this helps Here is a working snippet. Your ìds was always set to empty array because it was inside your function
code :
  var ids = [];

  function myFunction(list) {
    var student = new Object();
    student.idNo = document.getElementById("idNumber").value;
    student.firstName = document.getElementById("fName").value;
    student.lastName = document.getElementById("lName").value;

    if (ids.indexOf(student.idNo) == -1) {
      var text = " " + student.idNo + " " + student.firstName + " " + student.lastName;
      var li = document.createElement("li");
      var node = document.createTextNode(text);
    } else {
      alert("Duplicated ID");

  ID Number:
  <input type="text" id="idNumber">
  <br>First name:
  <input type="text" name="firstName" id="fName">
  <br>Last name:
  <input type="text" name="lastName" id="lName">
<button type="submit" onclick="myFunction(list)">Submit</button>
<div id="container">
  <ul id="list"></ul>
Xtext - Validating for duplicate names

Xtext - Validating for duplicate names

By : szympans
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The easiest is to mark the list entry by calling error not on the referenced player but on the playersList itself and call the error method that takes an index as well. e.g.
code :
error("bad", playersList, MyDslPackage.Literals.PLAYERS_LIST__PLAYERS, index)
Validating duplicate entries in a RecyclerView

Validating duplicate entries in a RecyclerView

By : user2077283
Date : March 29 2020, 07:55 AM
wish of those help I am trying to add the serial number in recycler view by using the add button. need to check whether duplicate value trying to add in recycler view. , You could do something like this:
code :
SerialNumberPojo serialNumberPojo = new SerialNumberPojo(serialNumberField.getText().toString());
if (!serialNumberPojoList.contains(serialNumberPojo)) {
public boolean equals(Object other) {
    if (this == other) return true;
    if (other == null || getClass() != other.getClass()) return false;

    SerialNumberPojo  that = (SerialNumberPojo) other;

    if (getId() != null && getId().equals(that.getId())) {
        return true;

    return false;
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