Remove Duplicate values from array Node.js

Question

I have created a form in which 1 drop down is there which stores the value of another drop down.but the issue is the drop down stores the duplicate values.What should I do so that the drop down wont display any redundant data.

The code is as folows :

<form class="form-inline" role="form" method="post" action="/assignloc">

                         <div class="form-group" style="margin-top:4%;">
                         <label for="exampleInputEmail1" class="h2color" >FE Name</label>

                           <select name="selectpicker" class="form-control">

                                <% for(var i=0;i<pic.length;i++){ %> 
                                <option value=<%=pic[i].name%>>
                                <%=pic[i].name%> </option>


                               <% } %>


                        </select>
 <label for="exampleInputEmail1" class="h2color" style="margin-left:10px;">Broker ID</label>
 <input type="text" class="form-control" placeholder="Broker Id" name="brokerid">

 <button type="submit" class="btn btn-primary btn-lg active">Assign</button>
</div>
</form>

You have to do exactly what you say in the question title: remove duplicate values from array. All that HTML is irrelevant, isn't it? What's the exact array structure and what have you tried so far? — Álvaro González
– Álvaro González, Commented Jul 3, 2015 at 11:02
what's your data response from the server? Do you just want to hide any duplicate values from the front end? Ideally, duplications shouldn't be posted to the server. If you also want to avoid duplications from the server in the first place, post your endpoint. :) — Tony Barnes
– Tony Barnes, Commented Jul 3, 2015 at 11:02
A general purpose unique filter for javascript stackoverflow.com/questions/30837373/… — Xotic750
– Xotic750, Commented Jul 3, 2015 at 11:11

S Shreya · Accepted Answer · 2016-03-29 10:34:55Z

2

Please find the below fiddle for similar example of removing duplicate array in nodejs https://jsfiddle.net/shreya7/rgn3y04e/

  var array= ["8","2","7","2", "6"];
  var earray = [];
     for(var i in array){
        if(earray .indexOf(array[i]) === -1){
            earray.push(array[i]);
        }
    }

  alert(earray);

answered Mar 29, 2016 at 10:34

S Shreya

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Comments

Thalaivar · Accepted Answer · 2015-07-03 11:03:34Z

0

var pic= ["1","2","1","1", "1", "1", "1", "3", "4", "6", "8", "9", "2"];
var uniquePic = [];
    for(var i in pic){
        if(uniquePic.indexOf(pic[i]) === -1){
            uniquePic.push(pic[i]);
        }
    }

console.log(uniquePic);

Below is a working fiddle: http://jsfiddle.net/spechackers/5bf3L78L/

answered Jul 3, 2015 at 11:03

Thalaivar

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2 Comments

Tony Barnes Over a year ago

Nice, but if you don't want duplicate values, they shouldn't be there in the first place.

Thalaivar Over a year ago

@TonyBarnes: I agree with you, but at some cases its acceptable... may be at different place they need with duplicates and at one place they don't need...

nalinc · Accepted Answer · 2015-07-03 11:06:03Z

0

You can simply use Array.filter to remove duplicate elements

var unique = arr.filter(function(elem, index, self) {
    return index == self.indexOf(elem);
})

Demo

answered Jul 3, 2015 at 11:06

nalinc

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Comments

Raja Rathinam · Accepted Answer · 2015-07-10 08:15:26Z

0

I think you are using EMBER JS I have corrected code snippet for you

<% 
var pictList = [];
for(var i=0;i<pic.length;i++){ 
    var pictItem = pic[i].name;
    var unique = true;
    for(var j=0; j<pictList.length; j++){
        if(pictList[j] == pictItem){
            unique = false;
            return;
        }
    }
    if(unique == true){
        pictList.push(pictItem);
%> 
    <option value=<%=pic[i].name%>>
        <%=pic[i].name%> </option>


    <%} } %>

edited Jul 10, 2015 at 8:15

answered Jul 6, 2015 at 8:18

Raja Rathinam

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Comments

Davide Bracaglia · Accepted Answer · 2019-11-07 12:05:39Z

0

I like to use Set:

var array = [1,1,2,3,3,4,4];  //your array
var uniqueSet = new Set(array);  //unique set with no duplicates  
var arrayWitoutDuplicates = Array.from(set);  //re-convert set to array

Or in short:

var array = [1,1,2,3,3,4,4];
var arrayWitoutDuplicates = Array.from(new Set(array));

answered Nov 7, 2019 at 12:05

Davide Bracaglia

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