Unleashing the power of Angular's ng-repeat: merging data across multiple arrays

Question

Unleashing the power of Angular's ng-repeat: merging data across multiple arrays

Is it possible to merge two arrays in Angular's ng-repeat functionality?

For instance, let's say we have arrays containing book titles and author names. How can we display the book titles along with their corresponding author names?

One array holds the book data, while another contains the author information.

What is the best way to combine the data in this scenario?

Check out the JSFiddle example: http://jsfiddle.net/1jxsh0x3/

var myApp = angular.module('myApp', []);

function MyCtrl($scope) {

  $scope.authors = [{
    id: "1",
    name: "John"
  }, {
    id: "2",
    name: "Peter"
  }, {
    id: "3",
    name: "Mark"
  }];
  
  $scope.books = [{
    id: "1",
    id_author: "3",
    name: "Book Lorem"
  }, {
    id: "2",
    id_author: "1",
    name: "Book Ipsum"
  }, {
    id: "3",
    id_author: "1",
    name: "Book Dark"
  }];
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js"></script>
<div ng-controller="MyCtrl">
  <div ng-repeat="book in books">
    <div>Book title: {{book.name}}</div>
    <div>Authors name: {{authors[$index].name}}</div>
    <hr>
  </div>
</div>

javascript angularjs

Answer 1

Answer №1

UPDATE: AngularJS 1.2 or later version is necessary

My recommendation would be to utilize the angulars filter:

<div>
    Author's name: {{authors[$index].name}}
</div>

and modify it to:

<div>
    Author's name: {{(authors | filter:{'id': book.id_author}:true)[0].name}}
</div>

Essentially, what we are implementing is filtering the array authors based on the expression 'id': book.id_author and then extracting the .name of the first element after filtering ([0]).

As a precaution, you can verify if the author exists in your array:

<div>
    Author's name: {{(authors | filter:{'id': book.id_author}:true) 
                     ? (authors | filter:{'id': book.id_author}:true)[0].name
                     : 'Unknown'}}
</div>

Warm regards

PS (UPDATE): test it out with angular 1.2.6 -> http://jsfiddle.net/abcd1234/1/

Answer 2

UPDATE: AngularJS 1.2 or later version is necessary

My recommendation would be to utilize the angulars filter:

<div>
    Author's name: {{authors[$index].name}}
</div>

and modify it to:

<div>
    Author's name: {{(authors | filter:{'id': book.id_author}:true)[0].name}}
</div>

Essentially, what we are implementing is filtering the array authors based on the expression 'id': book.id_author and then extracting the .name of the first element after filtering ([0]).

As a precaution, you can verify if the author exists in your array:

<div>
    Author's name: {{(authors | filter:{'id': book.id_author}:true) 
                     ? (authors | filter:{'id': book.id_author}:true)[0].name
                     : 'Unknown'}}
</div>

Warm regards

PS (UPDATE): test it out with angular 1.2.6 -> http://jsfiddle.net/abcd1234/1/

Answer 3

Answer №2

This is the most efficient solution tailored to address your specific issue.

Insert the code snippet below into your controller file -

$scope.entries = [];
angular.forEach($scope.books,function(entry) {
    var author_name;
    var searchField = "id";
    var searchVal = entry.id_author;
    author_name = getAuthorName(searchField,searchVal,$scope.authors)
    $scope.SubInformation['author_name'] = author_name;
    $scope.entries.push(angular.extend(entry,$scope.SubInformation));   
});

function getAuthorName(searchField,searchVal,authors){
    for (var i=0 ; i < authors.length ; i++)
    {
        if (authors[i][searchField] == searchVal) {
            return authors[i]['name'];
        }
    }
}

Also, update your view file with the following code snippet:

<div ng-controller="MyCtrl">
  <div ng-repeat="book in entries">
    <div>Book Title: {{book.name}}</div>
    <div>Author's Name: {{book.author_name}}</div>
    <hr>
  </div>
</div>

Answer 4

This is the most efficient solution tailored to address your specific issue.

Insert the code snippet below into your controller file -

$scope.entries = [];
angular.forEach($scope.books,function(entry) {
    var author_name;
    var searchField = "id";
    var searchVal = entry.id_author;
    author_name = getAuthorName(searchField,searchVal,$scope.authors)
    $scope.SubInformation['author_name'] = author_name;
    $scope.entries.push(angular.extend(entry,$scope.SubInformation));   
});

function getAuthorName(searchField,searchVal,authors){
    for (var i=0 ; i < authors.length ; i++)
    {
        if (authors[i][searchField] == searchVal) {
            return authors[i]['name'];
        }
    }
}

Also, update your view file with the following code snippet:

<div ng-controller="MyCtrl">
  <div ng-repeat="book in entries">
    <div>Book Title: {{book.name}}</div>
    <div>Author's Name: {{book.author_name}}</div>
    <hr>
  </div>
</div>

Answer 5

Answer №3

To enhance your functionality, consider creating a personalized findAuthor method
Opt for the standard filter function with strict option to precisely pinpoint the required author id instead of a similar one

angular.module('app',[])
.controller('ctrl', function($scope){

  $scope.authors = [{
    id: "1",
    name: "John"
  }, {
    id: "11",
    name: "Peter"
  }, {
    id: "3",
    name: "Mark"
  }];
  
  $scope.books = [{
    id: "1",
    id_author: "3",
    name: "Book Lorem"
  }, {
    id: "2",
    id_author: "1",
    name: "Book Ipsum"
  }, {
    id: "3",
    id_author: "1",
    name: "Book Dark"
  }];
  
    
  $scope.findAuthor = function(id){
    return $scope.authors.find(function(x){
    return x.id == id
   })};
})

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<h4>1. Custom findAuthor Method</h4>
<div ng-app='app', ng-controller='ctrl'>  
  <div ng-repeat="book in books">
      <div>Title of Book: {{book.name}}</div>
      <div>Name of Author: {{findAuthor(book.id_author).name}}</div>
      <hr>
  </div>
  
<h4>2. Utilizing Filter Function</h4>    
  <div ng-repeat="book in books">
    <div>Title of Book: {{book.name}}</div>
    <div>Name of Author: {{(authors | filter: {'id': book.id_author}: strict)[0].name}}</div>
    <hr>
  </div>

</div>

Answer 6

To enhance your functionality, consider creating a personalized findAuthor method
Opt for the standard filter function with strict option to precisely pinpoint the required author id instead of a similar one

angular.module('app',[])
.controller('ctrl', function($scope){

  $scope.authors = [{
    id: "1",
    name: "John"
  }, {
    id: "11",
    name: "Peter"
  }, {
    id: "3",
    name: "Mark"
  }];
  
  $scope.books = [{
    id: "1",
    id_author: "3",
    name: "Book Lorem"
  }, {
    id: "2",
    id_author: "1",
    name: "Book Ipsum"
  }, {
    id: "3",
    id_author: "1",
    name: "Book Dark"
  }];
  
    
  $scope.findAuthor = function(id){
    return $scope.authors.find(function(x){
    return x.id == id
   })};
})

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<h4>1. Custom findAuthor Method</h4>
<div ng-app='app', ng-controller='ctrl'>  
  <div ng-repeat="book in books">
      <div>Title of Book: {{book.name}}</div>
      <div>Name of Author: {{findAuthor(book.id_author).name}}</div>
      <hr>
  </div>
  
<h4>2. Utilizing Filter Function</h4>    
  <div ng-repeat="book in books">
    <div>Title of Book: {{book.name}}</div>
    <div>Name of Author: {{(authors | filter: {'id': book.id_author}: strict)[0].name}}</div>
    <hr>
  </div>

</div>

Answer 7

Answer №4

To achieve the desired outcome, follow these steps:

<div ng-repeat="book in books">
    <div>Book title: {{book.name}}</div>
    <div>Authors name: {{getAuthorName(book.id_author)}}</div>
</div>

Here's how to implement it in JavaScript:

$scope.getAuthorName(id) {
    var name;
    name = $scope.authors.find(function(author) {
        if(author.id_author === id) {
            return author.name;
        }
    }) 
    return name;
}

Give this a try and see if it works for you :)

Answer 8

To achieve the desired outcome, follow these steps:

<div ng-repeat="book in books">
    <div>Book title: {{book.name}}</div>
    <div>Authors name: {{getAuthorName(book.id_author)}}</div>
</div>

Here's how to implement it in JavaScript:

$scope.getAuthorName(id) {
    var name;
    name = $scope.authors.find(function(author) {
        if(author.id_author === id) {
            return author.name;
        }
    }) 
    return name;
}

Give this a try and see if it works for you :)

Answer 9

Answer №5

design a function to filter and retrieve names based on ID

$scope.getName = function(obj){

    return $scope.authors.find(o=>{
      if(o.id == obj.id_author){return o }
    })
  }

implement it as shown below

<div ng-controller="MyCtrl">
  <div ng-repeat="book in books">
    <div>Book title: {{book.name}}</div>
    <div>Authors name: {{getName(book).name}}</div>
    <hr>
  </div>
</div>

Check out the Demo

Answer 10

design a function to filter and retrieve names based on ID

$scope.getName = function(obj){

    return $scope.authors.find(o=>{
      if(o.id == obj.id_author){return o }
    })
  }

implement it as shown below

<div ng-controller="MyCtrl">
  <div ng-repeat="book in books">
    <div>Book title: {{book.name}}</div>
    <div>Authors name: {{getName(book).name}}</div>
    <hr>
  </div>
</div>

Check out the Demo

Answer 11

Answer №6

To easily compare the values and incorporate them into the books model, you can follow the steps outlined below:

var myApp = angular.module('myApp', []);

    function MyCtrl($scope) {

      $scope.authors = [{
        id: "1",
        name: "John"
      }, {
        id: "2",
        name: "Peter"
      }, {
        id: "3",
        name: "Mark"
      }];
      
      $scope.books = [{
        id: "1",
        id_author: "3",
        name: "Book Lorem"
      }, {
        id: "2",
        id_author: "1",
        name: "Book Ipsum"
      }, {
        id: "3",
        id_author: "1",
        name: "Book Dark"
      }];
      
      for(var i = 0; i < $scope.books.length; i++){
          var id = $scope.books[i].id_author;
          for(var j = 0; j < $scope.authors.length; j++){
              if($scope.authors[j].id ==  $scope.books[i].id_author ){
               $scope.books[i].authorName =  $scope.authors[j].name;
              }
          }
      }
      
   }

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<html ng-app = "myApp">
    <div ng-controller="MyCtrl">
        <div ng-repeat="book in books">
            <div>Book title: {{book.name}}</div>
            <div>Authors name: {{book.authorName}}</div>
            <hr>
        </div>
    </div>
</html>

Answer 12

To easily compare the values and incorporate them into the books model, you can follow the steps outlined below:

var myApp = angular.module('myApp', []);

    function MyCtrl($scope) {

      $scope.authors = [{
        id: "1",
        name: "John"
      }, {
        id: "2",
        name: "Peter"
      }, {
        id: "3",
        name: "Mark"
      }];
      
      $scope.books = [{
        id: "1",
        id_author: "3",
        name: "Book Lorem"
      }, {
        id: "2",
        id_author: "1",
        name: "Book Ipsum"
      }, {
        id: "3",
        id_author: "1",
        name: "Book Dark"
      }];
      
      for(var i = 0; i < $scope.books.length; i++){
          var id = $scope.books[i].id_author;
          for(var j = 0; j < $scope.authors.length; j++){
              if($scope.authors[j].id ==  $scope.books[i].id_author ){
               $scope.books[i].authorName =  $scope.authors[j].name;
              }
          }
      }
      
   }

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<html ng-app = "myApp">
    <div ng-controller="MyCtrl">
        <div ng-repeat="book in books">
            <div>Book title: {{book.name}}</div>
            <div>Authors name: {{book.authorName}}</div>
            <hr>
        </div>
    </div>
</html>

Answer 13

Answer №7

Combining JSON data from two sources can be done easily by creating a new array.

const mergedArray = authors.map(author => Object.assign(author, books.find(book => book.id === author.id)));

Answer 14

Combining JSON data from two sources can be done easily by creating a new array.

const mergedArray = authors.map(author => Object.assign(author, books.find(book => book.id === author.id)));

Answer 15

Answer №8

Here is the solution for you, complete with a demo :) ..just make sure your author array is sorted in my particular instance ;)

var myApp = angular.module('myApp', []);

function MyCtrl($scope) {

  $scope.authors = [{
    id: "1",
    name: "John"
  }, {
    id: "2",
    name: "Peter"
  }, {
    id: "3",
    name: "Mark"
  }];

  $scope.books = [{
    id: "1",
    id_author: "3",
    name: "Book Lorem"
  }, {
    id: "2",
    id_author: "1",
    name: "Book Ipsum"
  }, {
    id: "3",
    id_author: "1",
    name: "Book Dark"
  }];

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<html ng-app="myApp">
<div ng-controller="MyCtrl">
  <div ng-repeat="book in books">
    <div>Book Title: {{book.name}}</div>
    <div>Author's Name: {{authors[book.id_author -1].name}}</div>
    <hr>
  </div>
</div>

</html>

Answer 16

Here is the solution for you, complete with a demo :) ..just make sure your author array is sorted in my particular instance ;)

var myApp = angular.module('myApp', []);

function MyCtrl($scope) {

  $scope.authors = [{
    id: "1",
    name: "John"
  }, {
    id: "2",
    name: "Peter"
  }, {
    id: "3",
    name: "Mark"
  }];

  $scope.books = [{
    id: "1",
    id_author: "3",
    name: "Book Lorem"
  }, {
    id: "2",
    id_author: "1",
    name: "Book Ipsum"
  }, {
    id: "3",
    id_author: "1",
    name: "Book Dark"
  }];

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<html ng-app="myApp">
<div ng-controller="MyCtrl">
  <div ng-repeat="book in books">
    <div>Book Title: {{book.name}}</div>
    <div>Author's Name: {{authors[book.id_author -1].name}}</div>
    <hr>
  </div>
</div>

</html>

Unleashing the power of Angular's ng-repeat: merging data across multiple arrays

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

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