Validating existing key values in array with Javascript

Question

I have a small form where I enter values (id's and names) and store them in array by clicking a button, but I want to validate if there's an existing id key value in this array because I don't want to add repeated id key values.

Currently I have this:

<div class="form">
    <input type="text" id="idperson"><input type="text" id="name">
    <button id="add" type="button">ADD</button>
</div>
<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>
<script>
    var people = [];

    $("#add").click(function(){
        var iduser = $("#idperson").val();
        var name = $("#name").val();

        if(people["idperson"]!=iduser){
            people.push({idperson:iduser,nameperson:name});
        }
        console.log(people);
    });
</script>

But it's not working because it continues storing repeated idperson values when I enter info in the form:

I'm sorry if I'm forgetting something, I'm newbie on this.

How can I fix it? I'd like some help.

user3210641 · Accepted Answer · 2018-05-25 19:53:16Z

1

The problem is that people is an array of object which contain idperson attribute, not the object itself.

This should do the trick :

var people = [];

$("#add").click(function(){
  var iduser = $("#idperson").val();
  var name = $("#name").val();

  if (!people.find(person => person.idperson === iduser)) {
    people.push({ idperson:iduser, nameperson:name });
  }

  console.log(people);
});

edited May 25, 2018 at 19:53

answered May 25, 2018 at 18:52

user3210641

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6 Comments

NekoLopez Over a year ago

I forgot to say I had to change if line closing parenthesis iduser))

user3210641 Over a year ago

My bad ... Edited

NekoLopez Over a year ago

I have a question, what about if I want to remove element of array who has same iduser, how would be line code?

user3210641 Over a year ago

Remove the if block and change it for: people = people.filter(person => person.id !== iduser);

NekoLopez Over a year ago

Ok, but in this case, how can I use splice in this kind of array?

|

biswajit-rout · Accepted Answer · 2018-05-25 18:53:08Z

You can check if the input data is exist in the people array or not exist. Check here the working code.

Thanks

var people = [];
$(document).ready(function(){
    

    $("#add").click(function(){
        var iduser = $("#idperson").val();
        var name = $("#name").val();

        if(checkPersion({idperson:iduser,nameperson:name}) && people["idperson"]!=iduser){
            people.push({idperson:iduser,nameperson:name});
        } else {
        	console.log('User exist');
        }
        console.log(people);
       
    });
    function checkPersion(obj){
		for(var i=0;i<people.length ;i++){
        	if(people[i].idperson == obj.idperson && people[i].nameperson == obj.nameperson ){
            	return false;
            }
        }
        return true;
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="form">
    <input type="text" id="idperson"><input type="text" id="name">
    <button id="add" type="button">ADD</button>
</div>

Dmitry Kolchev · Accepted Answer · 2018-05-25 18:51:57Z

0

You can use javascript objects

<script>
var people = {};

$("#add").click(function(){
    var iduser = $("#idperson").val();
    var name = $("#name").val();

    if(!(iduser in people)){
        people[iduser] = name;
    }
    console.log(people);
});
</script>

answered May 25, 2018 at 18:51

Dmitry Kolchev

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