How to process an Array with object properties to generate react elements

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I am new to react and came from a jQuery background. I wanted to process an array of DOM elements that could be existed dynamically/randomly in the document. The properties define the Dom element type, attributes, and location via its parent.

I managed to achieve this with JQuery looping through the array and injecting HTML elements under its respectful parent using .appendTo() without defining a nested function using react.CreateElement to deal with each array item on a case per case bases.

//Array Example
 
       var data = [
                {
                    "component": "div",
                    "attributes": {
                    "id": "grid00",
                    "className": "grid"
                    },
                    "parent": "header"
                },
                {
                    "component": "div",
                    "attributes": {
                    "id": "row00",
                    "className": "row"
                    },
                    "parent": "grid00"
                },
                {
                    "component": "div",
                    "attributes": {
                    "id": "pivot00",
                    "className": "ms-Pivot ms-Pivot--large ms-Pivot--tabs tab-content"
                    },
                    "parent": "row00"
                },
                {
                    "component": "ul",
                    "attributes": {
                    "id": "pivotLinks00",
                    "className": "ms-Pivot-links nav-pills"
                    },
                    "parent": "pivot00"
                }
            ]

//JQuery Code Sample: 

            for(var i = 0; i < data.length;i++){
                $(`<${data[i].component} id="${data[i].attributes.id}" class="${data[i].attributes.className}">This is ${data[i].attributes.id} </${data[i].component}>`).appendTo(`#${data[i].parent}`);
                
                }
div{
border-style: solid;
padding-left: 10px;
padding-right: 10px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="header"></div>

for the updated question: React is unidirectional in nature and that is parent -> child. According to data structure, you are defining elements based on a children -> parent relationship, which wont work as far as i know using react.

For the sake of explaining to you i have created a very basic solution with an updated data structure which allows a parent -> child relationship.

const newData = [
{
component: "div",
attributes: {
  id: "grid00",
  className: "grid"
},
children: {
  component: "div",
  attributes: {
    id: "row00",
    className: "row"
  },
  children: {
    component: "div",
    attributes: {
      id: "pivot00",
      className: "ms-Pivot ms-Pivot--large ms-Pivot--tabs tab-content"
    },
    children: {
      component: "ul",
      attributes: {
        id: "pivotLinks00",
        className: "ms-Pivot-links nav-pills"
      },
      parent: "pivot00"
    }
  }
}
}
];

This way the nodes and children elements can be recursively created to form the element tree. Check this for the whole code working as you expected.

Hope this makes sense in what you are finally trying to achieve.

Working with Objects in React. Exploring various ways objects are , Including functions as object property values is a vital ability to give how you wish to process the object in question — you could even create your own iterator. an array of objects representing articlesconst articlesObj = [ In your text editor, you will need to create an array of the emoji data in the src/App.js file. Reopen the file if you have closed it: nano src/App.js Add an array that will contain objects that have the emoji and the emoji name. Note that emojis need to be surrounded by quote marks. Create this array above the App function:

You have the react concepts correct other than in the functional component ProcessObject, nothing is returned.

You can easity solve this by: Solution 1:

const ProcessObject = (props) => {  
  return props.data.map(data => <Node {...data}/>)
}

Solution 2:

const ProcessObject = (props) => props.data.map(data => <Node {...data}/>)

Lists and Keys – React, Finally, we assign the resulting array of elements to listItems : A “key” is a special string attribute you need to include when creating lists of elements. Step 4 — Reformatting Array Objects.map() can be used to iterate through objects in an array and, in a similar fashion to traditional arrays, modify the content of each individual object and return a new array. This modification is done based on what is returned in the callback function.

As you are new to react you should check out this lesson. That will indeed help you to get a clear view of how to create components form an array of data.

Rendering an Array of Data with map() and JSX, Luckily for us, this is easy to do in JSX thanks to an array method called map() . It uses the input element to create some JSX based on the person. you need to give every top-level item printed by that loop a key attribute that identifies it uniquely. x10 objects with key value pairs and merges them into the people array. The array has only 1 element and the element is the object (denoted by the curly braces “{ }”) containing three properties. To get these values, you access them like this:

Edit based on updated question:

Updated fiddle: https://jsfiddle.net/hLmtq0g9/ React components can be used the same way you would use recursive functions.

const data = [
    {
        //some keys
        children: //structure of data repeats
    }
];

class Example extends React.Component {
    render(){
        <div>
            <!-- use data keys -->
            <Example data={data.children} />
        </div>
    }
}

<Example data={data} />

Older Answer: You need to use the map in render function.

const items = [
        { text: "Learn JavaScript", id: '1' },
        { text: "Learn React", id: '2' },
        { text: "Play around in JSFiddle", id: '3' },
        { text: "Build something awesome", id: '4' }
      ];

class Example extends React.Component {

  render() {
    return (
      <div>
        <h2>Todos:</h2>
        <ol>
        {items.map(item => (
          <li id={item.id}>{item.text}</li>
        ))}
        </ol>
      </div>
    )
  }
}

Play around with it here https://jsfiddle.net/utfxcnko/

React iterate through object nested in array, I want to access the data in the object and then create a div that displays you should provide a key property to each element to allow React to� An array where the length is greater than the amount of numbered properties is known as a sparse array while one with the length equal to the number of numbered properties is a dense array.

React Filter: Filtering Arrays in React (With Examples), How to filter an array in React with examples. Picture the scene: you're creating a search filter component to allow your users to search a list of names. First, we define our JSX inside by opening a new curly bracket inside of a <div> element. Example 2: Filter an Array of Objects by Value in React. Try it on CodePen. This code displays a bullet list of numbers between 1 and 5. Basic List Component . Usually you would render lists inside a component.. We can refactor the previous example into a component that accepts an array of numbers and outputs a list of elements.

Loop Over and Display Data with JSX ― Scotch.io, React requires a unique identifier for each element in the array. This key attribute could be a unique ID, or something unique to each object. Here, we use the� We would use the Array.MAP function to extract data from Array objects. So let’s get started 🙂 . Contents in this project Get Object Value From Array and Show on Screen one by one in React Native Android iOS App Example: 1. Import StyleSheet, Text, View, Alert, ScrollView, Platform and TouchableOpacity component in your react native project.

Displaying Lists in React and JSX ― Scotch.io, Using JSX we can show lists using JavaScript's built-in Array.map() method. strategy is to create an Array using Object.keys() and use those keys to get values out want this is to loop through all the properties in an object and display them. Loop Over Array & Construct a New Object For the second method, we're going to loop over each item in an array and add each of its values as a new property in a new object. To match the object returned in the last section, the key value will be the array index for each item.

Comments
  • The explanation made sense and thanks for trying to help me out with the parent -> child relationship example. It did work on the current data-structure that you have updated, so I went ahead and added <li> elements under <ul > element but unfortunately, I couldn't add more than on the same level. One more note that I could have multiple rows on the same level that has children of other <div> and <li>.
  • I have included the multiple <li> example below: children: { component: "ul", attributes: { id: "pivotLinks00", className: "ms-Pivot-links nav-pills" }, parent: "pivot00", children: { component: "li", attributes: { id: "Links00", className: "ms-Pivot-links nav-pills" }, parent: "pivot00", }, children: { component: "li", attributes: { id: "Links01", className: "ms-Pivot-links nav-pills" }, parent: "pivot00", }, }
  • you can also handle multiple children similarly by creating an array of all sibling children elements recursively. i have updated the code for multiple sibling children here : codesandbox.io/s/cold-sky-qjp0m
  • In the initial testing, I could say this is working for me, I will mark this as an answer. Many thanks for your help.
  • Appreciate the help, this has helped me to compile my code, I have updated my question and added more clear details with working react code.
  • ok. i have added a new answer since now the question is very different after your update.
  • Thanks, defiantly could use it, but I am aware of how to render the elements in typical scenario as of all array items on under the same parent/level. But I needed help on how to render as a nested element under different parent/level. My question updated with working code and screenshot of end result
  • I have updated my question, I am trying to create a nested structure instead of rendering all the elements on the same level. thanks for your contribution