Using Angular's ng-repeat to handle duplicate elements

Question

Using Angular's ng-repeat to handle duplicate elements

My chosen front-end framework is Angular, and below is an example of how I structure my view:

   <div class="col-sm-6" ng-repeat="contact in service.contacts">

    <label class="control-label mb10">{{contact.textDescription | decodeURIComponent}}</label>
               <select  multiple="multiple" selectize>
                   <option>{{contact.value}}</option>
              </select>

     </div>

I am facing a specific issue that I'm struggling to resolve. When it comes to the contact.textDescription field, I only want unique values to be displayed. If a duplicate textDescription is encountered, I do not want to create a new field. Instead, I want to simply add the contact.value to the options of the existing textDescription entry. Here's an idea of what I am trying to achieve:

if(contact.textDescription is duplicate) {
 contact.value.addTo(contact.textDescription which already exists)
}

I am considering applying a filter to address this problem. Any suggestions on how to approach this?

javascript angularjs angularjs-ng-repeat

Answer 1

Answer №1

Based on the information you provided, I believe utilizing the filter mentioned in the subsequent response will assist you in achieving your desired outcome.

Click here to access the related question

Answer 2

Based on the information you provided, I believe utilizing the filter mentioned in the subsequent response will assist you in achieving your desired outcome.

Click here to access the related question

Answer 3

Answer №2

Utilize ng-options for organizing and showcasing distinctive values.

Answer 4

Utilize ng-options for organizing and showcasing distinctive values.

Answer 5

Answer №3

If you want to filter out duplicates, you can utilize the uniqFilter from the angular-filter module.
To use: Simply apply the filter like this: collection | unique: 'property' or nested.property
Alternative names: You can also use uniq

Here is an example:
In JavaScript:

function MainController ($scope) {
  $scope.orders = [
    { id:1, customer: { name: 'John',    id: 10 } },
    { id:2, customer: { name: 'William', id: 20 } },
    { id:3, customer: { name: 'John',    id: 10 } },
    { id:4, customer: { name: 'William', id: 20 } },
    { id:5, customer: { name: 'Clive',   id: 30 } }
  ];
}

In HTML:

<th>Customer list:</th>
<tr ng-repeat="order in orders | unique: 'customer.id'" >
   <td> {{ order.customer.name }} , {{ order.customer.id }} </td>
</tr>

RESULT:

Customer list:
- John 10
- William 20
- Clive 30

Answer 6

If you want to filter out duplicates, you can utilize the uniqFilter from the angular-filter module.
To use: Simply apply the filter like this: collection | unique: 'property' or nested.property
Alternative names: You can also use uniq

Here is an example:
In JavaScript:

function MainController ($scope) {
  $scope.orders = [
    { id:1, customer: { name: 'John',    id: 10 } },
    { id:2, customer: { name: 'William', id: 20 } },
    { id:3, customer: { name: 'John',    id: 10 } },
    { id:4, customer: { name: 'William', id: 20 } },
    { id:5, customer: { name: 'Clive',   id: 30 } }
  ];
}

In HTML:

<th>Customer list:</th>
<tr ng-repeat="order in orders | unique: 'customer.id'" >
   <td> {{ order.customer.name }} , {{ order.customer.id }} </td>
</tr>

RESULT:

Customer list:
- John 10
- William 20
- Clive 30

Answer 7

Answer №4

Arranging your connections based on textDescription can help you solve the issue at hand. You may want to consider implementing something similar to the following:

html:

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Example - GroupBy Filter</title>

    <script src="angular-1.4.7.min.js"></script>
    <script src="script.js"></script>

</head>
<body ng-app="app">
    <div ng-controller="MainController">
        <div ng-repeat="(key, contacts) in (service.contacts | groupBy: 'textDescription')">

            <label class="control-label">{{key}}</label>
            <select  multiple="multiple" selectize>
                <option ng-repeat="contact in contacts">{{contact.value}}</option>
            </select>
        </div>
    </div>
</body>

script.js:

var app = angular.module("app", []);

app.controller("MainController", function ($scope) {
    $scope.service = {};
    $scope.service.contacts = [{
        "textDescription": "td1",
         "value": "1"
    }, {
        "textDescription": "td2",
         "value": "2"
    }, {
        "textDescription": "td3",
        "value": "3"
    }, {
        "textDescription": "td1",
        "value": "4"
    }, {
        "textDescription": "td3",
        "value": "5"
    }, {
        "textDescription": "td1",
        "value": "6"
    }];
});

app.filter('groupBy', function () {
    var results={};
    return function (data, key) {
        if (!(data && key)) return;
        var result;
        if(!this.$id){
            result={};
        }else{
            var scopeId = this.$id;
            if(!results[scopeId]){
                results[scopeId]={};
                this.$on("$destroy", function() {
                    delete results[scopeId];
                });
            }
            result = results[scopeId];
        }

        for(var groupKey in result)
            result[groupKey].splice(0,result[groupKey].length);

        for (var i=0; i<data.length; i++) {
            if (!result[data[i][key]])
                result[data[i][key]]=[];
            result[data[i][key]].push(data[i]);
        }

        var keys = Object.keys(result);
        for(var k=0; k<keys.length; k++){
            if(result[keys[k]].length===0)
                delete result[keys[k]];
        }
        return result;
    };
});

Your contacts are now grouped by textDescription, ensuring that the field for it (<label>) is only generated once and values are appended to <option> tags accordingly.

Answer 8

Arranging your connections based on textDescription can help you solve the issue at hand. You may want to consider implementing something similar to the following:

html:

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Example - GroupBy Filter</title>

    <script src="angular-1.4.7.min.js"></script>
    <script src="script.js"></script>

</head>
<body ng-app="app">
    <div ng-controller="MainController">
        <div ng-repeat="(key, contacts) in (service.contacts | groupBy: 'textDescription')">

            <label class="control-label">{{key}}</label>
            <select  multiple="multiple" selectize>
                <option ng-repeat="contact in contacts">{{contact.value}}</option>
            </select>
        </div>
    </div>
</body>

script.js:

var app = angular.module("app", []);

app.controller("MainController", function ($scope) {
    $scope.service = {};
    $scope.service.contacts = [{
        "textDescription": "td1",
         "value": "1"
    }, {
        "textDescription": "td2",
         "value": "2"
    }, {
        "textDescription": "td3",
        "value": "3"
    }, {
        "textDescription": "td1",
        "value": "4"
    }, {
        "textDescription": "td3",
        "value": "5"
    }, {
        "textDescription": "td1",
        "value": "6"
    }];
});

app.filter('groupBy', function () {
    var results={};
    return function (data, key) {
        if (!(data && key)) return;
        var result;
        if(!this.$id){
            result={};
        }else{
            var scopeId = this.$id;
            if(!results[scopeId]){
                results[scopeId]={};
                this.$on("$destroy", function() {
                    delete results[scopeId];
                });
            }
            result = results[scopeId];
        }

        for(var groupKey in result)
            result[groupKey].splice(0,result[groupKey].length);

        for (var i=0; i<data.length; i++) {
            if (!result[data[i][key]])
                result[data[i][key]]=[];
            result[data[i][key]].push(data[i]);
        }

        var keys = Object.keys(result);
        for(var k=0; k<keys.length; k++){
            if(result[keys[k]].length===0)
                delete result[keys[k]];
        }
        return result;
    };
});

Your contacts are now grouped by textDescription, ensuring that the field for it (<label>) is only generated once and values are appended to <option> tags accordingly.

Using Angular's ng-repeat to handle duplicate elements

Answer №1

Answer №2

Answer №3

Answer №4

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