I’m using Knockoutjs on a registration form. I have runtime error when user click button to show password field
JavaScript runtime error: Unable to get property ‘length’ of undefined or null reference
how to handle runtime exception in KO.js?
self.showHidePasswordField = function () {
if (self.password1().length > 0 || typeof self.password1().length !== 'undefined') {
console.log('show');
} else {
console.log('hide');
}
};
Answer
Assuming you are sure you defined the password1 observable, you can try the following:
if (self.password1() != null && typeof self.password1().length !== 'undefined')