React function - is not defined no-undef

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I get the following error when trying to compile my app 'handleProgress' is not defined no-undef.

I'm having trouble tracking down why handleProgress is not defined.

Here is the main react component

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      progressValue: 0,
    };

    this.handleProgress = this.handleProgress.bind(this);
  }

  render() {
    const { questions } = this.props;
    const { progressValue } = this.state;
    const groupByList = groupBy(questions.questions, 'type');
    const objectToArray = Object.entries(groupByList);



    handleProgress = () => {
      console.log('hello');
    };

    return (
      <>
        <Progress value={progressValue} />
        <div>
          <ul>
            {questionListItem && questionListItem.length > 0 ?
              (
                <Wizard
                  onChange={this.handleProgress}
                  initialValues={{ employed: true }}
                  onSubmit={() => {
                    window.alert('Hello');
                  }}
                >
                  {questionListItem}
                </Wizard>
              ) : null
            }
          </ul>
        </div>
      </>
    );
  }
}

Your render method is wrong it should not contain the handlePress inside: You are calling handlePress on this so you should keep it in the class.

     class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      progressValue: 0,
    };

    this.handleProgress = this.handleProgress.bind(this);
  }


    handleProgress = () => {
      console.log('hello');
    };


  render() {
    const { questions } = this.props;
    const { progressValue } = this.state;
    const groupByList = groupBy(questions.questions, 'type');
    const objectToArray = Object.entries(groupByList);
    return (
      <>
        <Progress value={progressValue} />
        <div>
          <ul>
            {questionListItem && questionListItem.length > 0 ?
              (
                <Wizard
                  onChange={this.handleProgress}
                  initialValues={{ employed: true }}
                  onSubmit={() => {
                    window.alert('Hello');
                  }}
                >
                  {questionListItem}
                </Wizard>
              ) : null
            }
          </ul>
        </div>
      </>
    );
  }
}

function is not defined no-undef · Issue #7965 · facebook/create , Error: ./src/Hello.js Line 9:16: 'Hello' is not defined no-undef Search for the keywords to learn more about each error. My Hello.js: `import React,  Try this one, I have check it on react version 16.8.6. We don't need to bind in new version using arrow head functions. Here is the full implementation of binding argument method and non argument method.


If you are using handleProgress inside render you have to define it follows.

const handleProgress = () => {
      console.log('hello');
    };

if it is outside render and inside component then use as follows:

handleProgress = () => {
      console.log('hello');
    };

If you are using arrow function no need to bind the function in constructor it will automatically bind this scope.

Build error `no-undef` for flowtypes with class properties · Issue , src/App.js Line 16: 'state' is not defined no-undef Search for the keywords to https://github.com/ubershmekel/create-react-app-flowtypes if it's related, I have another component where adding an arrow function property:. Solution : ReactJs Error 'Component' is not defined no-undef. Search for the keywords to learn more about each error. This error occurred during the build time and cannot be dismissed. When creating a react application the following error comes "'Component' is not defined no-undef."


handleProgress should not be in the render function, Please keep functions in you component itself, also if you are using ES6 arrow function syntax, you no need to bind it on your constructor.

Please refer the below code block.

  class App extends Component {
    constructor(props) {
      super(props);
      this.state = {
        progressValue: 0,
      };
      // no need to use bind in the constructor while using ES6 arrow function. 
      // this.handleProgress = this.handleProgress.bind(this);
    }
    // move ES6 arrow function here. 
    handleProgress = () => {
      console.log('hello');
    };
    render() {
      const { questions } = this.props;
      const { progressValue } = this.state;
      const groupByList = groupBy(questions.questions, 'type');
      const objectToArray = Object.entries(groupByList);

      return (
        <>
          <Progress value={progressValue} />
          <div>
            <ul>
              {questionListItem && questionListItem.length > 0 ?
                (
                  <Wizard
                    onChange={this.handleProgress}
                    initialValues={{ employed: true }}
                    onSubmit={() => {
                      window.alert('Hello');
                    }}
                  >
                    {questionListItem}
                  </Wizard>
                ) : null
              }
            </ul>
          </div>
        </>
      );
    }
  }

Solution : ReactJs Error 'Component' is not defined no-undef., Image · Error knockout.js Uncaught ReferenceError: Unable to process binding "​foreach: function(){  stephenbe changed the title Getting'$' is not defined no-undef when trying to use jquery Getting '$' is not defined no-undef when trying to use jquery May 8, 2018 Copy link Quote reply Member


Try this one, I have check it on react version 16.8.6

We don't need to bind in new version using arrow head functions. Here is the full implementation of binding argument method and non argument method.

import React, { Component } from "react";

class Counter extends Component {
  state = {
    count: 0
  };

  constructor() {
    super();
  }

  render() {
    return (
      <div>
        <button onClick={this.updateCounter}>NoArgCounter</button>
        <button onClick={() => this.updateCounterByArg(this.state.count)}>ArgCounter</button>
        <span>{this.state.count}</span>
      </div>
    );
  }

  updateCounter = () => {
    let { count } = this.state;
    this.setState({ count: ++count });
  };

  updateCounterByArg = counter => {
    this.setState({ count: ++counter });
  };
}

export default Counter;

React 'Component' is not defined - Programming Help, src/people.js Line 3:22: 'Component' is not defined no-undef. And this is people.js import React from 'react'; class People extends Component  yannickcr changed the title Bug: jsx-uses-vars and react-in-jsx-scope does not work properly outside React.createClass no-undef mark JSX elements as not defined Mar 24, 2015 This was referenced Mar 24, 2015


React function - is not defined no-undef - reactjs - html, I get the following error when trying to compile my app 'handleProgress' is not defined no-undef. I'm having trouble tracking down why handleProgress is not  Disallow Undeclared Variables (no-undef) The "extends": "eslint:recommended" property in a configuration file enables this rule.. This rule can help you locate potential ReferenceErrors resulting from misspellings of variable and parameter names, or accidental implicit globals (for example, from forgetting the var keyword in a for loop initializer).


jQuery exists but get "'jQuery' is not defined no-undef" : javascript, it returns "function", however, when I try to use it in my component with 'jQuery' is not defined no-undef is not an exception, it's just ESLint warning. I have build and open sourced an automated irrigation system based on Node.js and React. React is pretty flexible but it has a single strict rule: All React components must act like pure functions with respect to their props. Of course, application UIs are dynamic and change over time. In the next section, we will introduce a new concept of “state”. State allows React components to change their output over time in response to


no-undef - Rules - ESLint, This rule also does not disallow redeclarations of global variables. /*eslint no-​undef: "error"*/ if (typeof UndefinedIdentifier === "undefined") { // do something } "error"*/ /*eslint-env node*/ var fs = require("fs"); module.exports = function()  We are using React.createClass in prop-types, display-name and no-multi-comp to detect React component and to apply the rules on the object.. Obviously we need to figure out a new way to detect React components when using ES6 classes.