Refs in react

Aug 4, 2017Download as pptx, pdf1 like174 views

Topics covered : - Where is ref used ? - Adding Ref To DOM Element - Adding Ref To Class Component - Ref & Functional Component

Fetch Data from Input Elements
● Using JavaScript Approach ( Not Recommended in React )
● Using jQuery Approach ( Not Recommended in React )
● Using Refs ( React Recommendation )

Where to use jQuery and JavaScript ?
● In legacy application being Upgraded to React.

Why not to use jQuery and JavaScript to fetch Data ?
● Do not use class/id to manipulate DOM.
● Will make Application less Efficient
● Will not work in Isomorphic Application

Where is ref used ?
● Managing focus, text selection, or media playback.
● Triggering imperative animations.
● Integrating with third party Dom libraries

A DOM Element
<input
type=”text”
className=”form-control”
id=”numOf100s”
name=”numOf100s”
placeholder=”Enter No of 100”
required
/>

<input
type=”text”
className=”form-control”
id=”numOf100s”
name=”numOf100s”
ref={
input =>
this.numOf100s = input
}
placeholder=”Enter No of 100”
required
/>
const tempVal=this.numOf100s.value
1. Adding a ref callback 2. Fetch the value

A Class Component
Class TextInput extends React.Component {
render() {
return(
<input
type=”text”
className=”form-control”
id=”numOf100s”
name=”numOf100s”
ref = {input => {this.numOf100s = input}}
placeholder=”Enter No of 100”
required
/>
);
}
}

class TextInput extends React.Component {
componentDidMount() {
this.textInput.focus();
}
render() {
return (
<CustomTextInput
ref={(input) => { this.textInput = input; }} />
);
}
}
const tempVal= this.textInput.numOf100s.value
1. Adding a ref callback 2. Fetch the value

We may not use refs on functional component as they do not have instance.
BUT, inside functional components we can use refs as long as they refer DOM elements
or a class components

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Refs in react

1. Refs in React by Prabal

2. Fetch Data from Input Elements ● Using JavaScript Approach ( Not Recommended in React ) ● Using jQuery Approach ( Not Recommended in React ) ● Using Refs ( React Recommendation )

3. Where to use jQuery and JavaScript ? ● In legacy application being Upgraded to React.

4. Why not to use jQuery and JavaScript to fetch Data ? ● Do not use class/id to manipulate DOM. ● Will make Application less Efficient ● Will not work in Isomorphic Application

5. Where is ref used ? ● Managing focus, text selection, or media playback. ● Triggering imperative animations. ● Integrating with third party Dom libraries

6. Adding Ref To DOM Element

7. A DOM Element <input type=”text” className=”form-control” id=”numOf100s” name=”numOf100s” placeholder=”Enter No of 100” required />

8. <input type=”text” className=”form-control” id=”numOf100s” name=”numOf100s” ref={ input => this.numOf100s = input } placeholder=”Enter No of 100” required /> const tempVal=this.numOf100s.value 1. Adding a ref callback 2. Fetch the value

9. Adding Ref To Class Component

10. A Class Component Class TextInput extends React.Component { render() { return( <input type=”text” className=”form-control” id=”numOf100s” name=”numOf100s” ref = {input => {this.numOf100s = input}} placeholder=”Enter No of 100” required /> ); } }

11. class TextInput extends React.Component { componentDidMount() { this.textInput.focus(); } render() { return ( <CustomTextInput ref={(input) => { this.textInput = input; }} /> ); } } const tempVal= this.textInput.numOf100s.value 1. Adding a ref callback 2. Fetch the value

12. Ref & Functional Component

13. We may not use refs on functional component as they do not have instance. BUT, inside functional components we can use refs as long as they refer DOM elements or a class components