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JS / Cannot read property 'push' of undefined


JS / Cannot read property 'push' of undefined

By : user2957022
Date : November 22 2020, 03:03 PM
Does that help I have the following code in JS: , You should add some curly braces on the condition
code :
if (all[j][i][11] != Boolean(1) && $scope.w[j][i] != undefined && $scope.ip[j][i] != undefined && $scope.type[j][i] != undefined){
    var specificArray = []
    specificArray.push($scope.w[j][i]);
}
if (all[j][i][11] != Boolean(1) && $scope.w[j][i] != undefined && $scope.ip[j][i] != undefined && $scope.type[j][i] != undefined){
    var specificArray = [];
}
specificArray.push($scope.w[j][i]); // Cannot read property 'push' of undefined


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Polymer + Firebase (Polymerfire): Cannot read property 'push' of undefined': 'this.$.query.ref.push(...)'

Polymer + Firebase (Polymerfire): Cannot read property 'push' of undefined': 'this.$.query.ref.push(...)'


By : Fitim Durmishi
Date : March 29 2020, 07:55 AM
help you fix your problem First, I recommend comparing your code to the Polycast #58 source in GitHub, which might reveal the problem more clearly to you.
this.$.query.ref (.ref) refers to the ref property of Polymer.FirebaseDatabaseBehavior, which is computed with:
code :
__computeRef: function(db, path) {
  if (db == null ||
      path == null ||
      !this.__pathReady(path) ||
      this.disabled) {
    return null;
  }

  return db.ref(path);
},
React browserHistory.push giving Uncaught TypeError: Cannot read property 'push' of undefined

React browserHistory.push giving Uncaught TypeError: Cannot read property 'push' of undefined


By : Jaypro
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Here's a reproducible example of how to programmatically change routes in react router v4.
First, install the boilerplate for a simple app:
code :
sudo npm install -g create-react-app
create-react-app demo-app
cd demo-app
npm install react-router-dom
import React from 'react'
import {BrowserRouter as Router, Route, Link, withRouter} from 'react-router-dom'

const BasicExample = () => (
  <Router>
    <div>
      <li><Link to="/">Home</Link></li>
      <li><Link to="/about">About</Link></li>

      <Route exact path="/" component={Home}/>
      <Route path="/about" component={About}/>
    </div>
  </Router>
)

const Home = () => (
  <div>
    <h2>Home</h2>
  </div>
)

const Button = withRouter(({history}) => (
  <button type='button' onClick={() => { history.push('/new-location') }}>Click Me!</button>
))

const About = () => (
  <div>
    <h2>About</h2>
    <Button />
  </div>
)

export default BasicExample
npm run start
React Native Navigation how to push a screen?(cannot read property push of undefined)

React Native Navigation how to push a screen?(cannot read property push of undefined)


By : Malcolm O'Keeffe
Date : March 29 2020, 07:55 AM
like below fixes the issue I want to push a screen but I get the following error (cannot read property push of undefined).Anyone knows how I can push a screen with the following code?(I have correctly registered the screen in the App.js file) , Have you passed navigator as a prop to this component?
code :
<LoginForm
   navigator={this.props.navigator}
/>
TypeError: Cannot read property 'push' of undefined, i can't push comments to data array

TypeError: Cannot read property 'push' of undefined, i can't push comments to data array


By : Jon Brett Moody
Date : March 29 2020, 07:55 AM
will be helpful for those in need EDIT: This answer presumes the syntax error is due to a missing }); after the camp.remove() function.
Without knowing what Camp looks like, I will presume that camp.create() will pass the definition of a camp to the callback method. If that is the case, then it would appear you need to use campground rather than camp since it would appear that the new camp is passed into that callback function as campground.
Error: cannot read property push of undefined when using .push on an empty array that is stored in an object

Error: cannot read property push of undefined when using .push on an empty array that is stored in an object


By : user2471746
Date : March 29 2020, 07:55 AM
around this issue The in operator has lower precedence than the ! operator. You need to add brackets around param in data; change
code :
if(!param in data)
if(!(param in data))
$('.save').on('click', function() {
  event.preventDefault();
  var data = {};

  $('.input_product').each(function() {

    const
    param = $(this).attr('name'),
    upc = $(this).parent().parent().attr('id'),
    value = $(this).val()

    console.log(param, upc, value);

    if (value && param) {
       if (!(param in data)) {//added brackets
           data[param] = [];
       }
       data[param].push({'upc':upc, 'value':value}); 
    }
  });
 window.someFunction(data);
});
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