CODEWITHSUNDEEP
reactjstypescriptoffice-jsoffice-ui-fabrictsx
Ethan
Ethan

Reputation: 837

How to Use One handleChange Event for Multiple TextFields?

In the following code, I have the "Supplier Name" TextField set to all Upper Case letters. If I wanted to add this to the "Comments" TextField, I know that I can just add more handleChange events and name them differently. Is there a way to use the same handleChange event for multiple TextFields since I want to do the exact same thing?

import * as React from "react";
import { TextField} from 'office-ui-fabric-react/lib/TextField';
export interface StackOverflowState {
    value: string;
  }
  export default class StackOverflow extends React.Component<{}, StackOverflowState> {
    public state: StackOverflowState = { value: '' };
    render() {
      this.handleChange = this.handleChange.bind(this);
      ;

      return (
        <div className="ms-welcome">
            <TextField 
                label="Supplier Name"
                styles={{ root: { width: 150 } }}
                onChange={this.handleChange.bind(this)}
                value={this.state.value}
            />
            <TextField 
                label="Comments"
                styles={{ root: { width: 300 } }}
            />
        </div>
      );
    }
    handleChange(event) {
      this.setState({value: event.target.value.toUpperCase()});
    }
  }

Upvotes: 0

Views: 1457

Answers (4)

Mor Shemesh
Mor Shemesh

Reputation: 2897

Try using the bind a little more :)

import * as React from "react";
import { TextField} from 'office-ui-fabric-react/lib/TextField';
export interface StackOverflowState {
    value: string;
    comments: string;
  }
  export default class StackOverflow extends React.Component<{}, StackOverflowState> {
    public state: StackOverflowState = { value: '', comments: '' };

    private const handleChange = (stateField: keyof StackOverflowState) => (event) {
      this.setState({ [stateField]: event.target.value.toUpperCase()});
    }

    render() {
      return (
        <div className="ms-welcome">
            <TextField 
                label="Supplier Name"
                styles={{ root: { width: 150 } }}
                onChange={this.handleChange('value')}
                value={this.state.value}
            />
            <TextField 
                label="Comments"
                onChange={this.handleChange.('comments')}
                styles={{ root: { width: 300 } }}
            />
        </div>
      );
    }
  }

Upvotes: 1

keikai
keikai

Reputation: 15186

Some notice points:

  • do not use .bind(this) inside render(), optionally use arrow function.
  • use constructor() to init state for classical component.
  • common handler function with identify index been passed as a param.
  • use [key: string]: State[keyof State] to enable choosing attribute by a string.

Further, we can:

  • use an Array of state
  • use a local HOC to avoid repeating yourself on the index
  • use an Array to generate the rendered elements
import * as React from "react";
import { TextField } from "office-ui-fabric-react/lib/TextField";

export interface State {
  [key: string]: State[keyof State];
  inputA: string;
  inputB: string;
}
export default class App extends React.Component<{}, State> {
  constructor(props: {}) {
    super(props);
    this.state = {
      inputA: "",
      inputB: ""
    };
  }
  handleChange = (field: string) => (event: any) => {
    const value = event.target.value.toUpperCase();
    this.setState({ [field]: value });
  };
  render() {
    console.log(this.state);
    return (
      <div className="ms-welcome">
        <TextField
          label="Supplier Name"
          styles={{ root: { width: 150 } }}
          onChange={this.handleChange("inputA")}
          value={this.state["inputA"]}
        />
        <TextField
          label="Comments"
          styles={{ root: { width: 300 } }}
          onChange={this.handleChange("inputB")}
          value={this.state["inputB"]}
        />
      </div>
    );
  }
}

Edit peaceful-mestorf-xbj6x

Upvotes: 2

Zohaib
Zohaib

Reputation: 1037

To handle multiple inputs with single event handler. You have to give unique names to your input values and you can write your handle change based on unique names.

<div className="ms-welcome">
        <TextField 
            name="input1"
            onChange={this.handleChange.bind(this)}
            value={this.state.value}
        />
        <TextField 
            name="input2"
            onChange={this.handleChange.bind(this)}
            value={this.state.value}
        />
    </div>

Now you can simply write handle change based on unique names applied to input fields

HandleChange (e) {
 this.setState({[e.target.name]: e.target.value})
}

When event comes from first input e.target.name will be input1 and when event comes from second input e.target.name will be input2.

Upvotes: 1

Zohaib Ijaz
Zohaib Ijaz

Reputation: 22935

You can use object as state containing keys as field names and values against respective field names

state = { values : {} };

onChange = (name, e) => {
   this.setState(state => ({ values: { ...state.values, [name]: e.target.value } }));

  // If e.target.name contains field name, no need to add extra name parameter in this method, you can use that as name

}

     <TextField 
            label="Supplier Name"
            styles={{ root: { width: 150 } }}
            onChange={e => this.handleChange('supplierName', e)}
            value={this.state.values.supplierName}
        />
 <TextField 
            label="Comments"
            styles={{ root: { width: 300 } }}
            onChange={e => this.handleChange('comments', e)}
            value={this.state.values.comments}
        />

Upvotes: 1

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