cannot read property
/* This error occurs in Chrome Browser when you read a property or call
a method on an undefined object. */
// To handle it, use "Optional Chaining" compatible with Node.js v14.0.0
Syntax -> ?.
Usage ->
let obj;
console.log(obj.a) // Cannot read property 'a' of undefined
console.log(obj?.a) // Works like a charmcannot read property
// That is mostly because the object was not declared until the moment when the code ran,
// Example:
console.log(object.list.map(el => el.name))
const object = {
list: [
{name: 'test'},
{name: 'second'}
]
}
// The error happens because the object was created after the map call
// The same happens if you forgot to import a package for example.
// If you are dealing with a situation that you don't know if the object
// has an specific property, you can use a question mark to tell the compiler
// that maybe the property doesen't exists, returning undefined:
console.log(object.default.size) // error
console.log(object.list[1]?.age) // undefined
console.log(object.default?.color) // undefinedcannot read property
JavaScript TypeError is thrown when an operand or argument passed to a function is incompatible with the type expected by that operator or function. This error occurs in Chrome Browser when you read a property or call a method on an undefined object .JavaScript TypeError is thrown when an operand or argument passed to a function is incompatible with the type expected by that operator or function. This error occurs in Chrome Browser when you read a property or call a method on an undefined object .cannot read property
Seems like one of your values, with a property key of 'value' is undefined. Test that i1, i2and __i are defined before executing the if statements:
var i1 = document.getElementById('i1');
var i2 = document.getElementById('i2');
var __i = {'user' : document.getElementsByName("username")[0], 'pass' : document.getElementsByName("password")[0] };
if(i1 && i2 && __i.user && __i.pass)
{
if( __i.user.value.length >= 1 ) { i1.value = ''; } else { i1.value = 'Acc'; }
if( __i.pass.value.length >= 1 ) { i2.value = ''; } else { i2.value = 'Pwd'; }
}Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
