How to check whether a javascript object contains any values while having keys

Question

I have a javascript object which contains error messages:

err: {
  subject: '',
  body: '',
  recipient: ''
},

i want to disable a submit button based on whether an error is present. in the above declaration, there are no errors present.

i'm aware of Object.values(err) but i do not know how to use the resulting list, which has a length of 3.

how would I do this? thank you

Answer 1

You can use Array.some() on the Object.values() to check if there are some error messages

let obj = {
  err: {
    subject: '',
    body: '',
    recipient: ''
  }
};

let someErrors = Object.values(obj.err).some(e => e.length);
console.log(someErrors);

Answer 2

const obj = {name: "Naimur", age: 21}

console.log("name" in obj) => true

console.log("age" in obj) => true

console.log("location" in obj) => false

Answer 3

Maybe like this:

var data={
  err: {
    subject: '',
    body: '',
    recipient: ''
  },
};

if(data.err.subject!='' || data.err.body!='' || data.err.recipient!=''){
	console.log('ERROR!');
}else{
	console.log('ALL RIGHT!');
}

Answer 4

var err =  {
  subject: 'some error',
  body: 'message',
  recipient: 'Tom'
};

Object.values(err) will return an array Array ["some error", 'message', 'Tom']. Now, you can check the values of this array and then disable the button if these values satisfy some conditions.

Hope it helps.

Answer 5

I'm assuming that all of the elements have to equal '' for there to be a valid error. So you can use the .every() method to check every element in the returned array. If only some of the elements have to equal '' for there to be an error message, just user .some() instead.

let err = {
  subject: '',
  body: '',
  recipient: ''
}

console.log(!Object.values(err).every(e => e === '')) //returns false meaning there isn't an error message

Answer 6

you may use .reduce() to return the sum of errors and also check if err has values with this code

if( (Object.values(err).length) ? Object.values(err).reduce((ac, next) => ac + next.length, 0) :false ){
  console.log( 'there is errors' );   
}