Cannot read property 'target' of undefined

Question

In my render method I have component

handleChange is fol

Answer 1

You are executing function rather than passing it as a prop.

You need to change this,

 onChange={this.handleChange()}

with this,

 onChange={this.handleChange}

Answer 2

Changing this onChange={this.handleChange} to this onChange={() => this.handleChange()} may also help if all the suggestions above don't work.

Answer 3

The problem is that you are invoking the function in this line:

onChange={this.handleChange()}

All you have to do is simply pass the function as a value to onChange without invoking it.

onChange={this.handleChange}

When you use parenthesis you'd be invoking a function/method instead of binding it with an event handler. Compare the following two examples:

//invokes handleChange() and stores what the function returns in testA.
const testA = this.handleChange()  

vs

//stores the function itself in testB. testB be is now a function and may be invoked - testB();
const testB = this.handleChange 

Answer 4

You can fix it like this

function handleChange(event) {
    const value =  event.taget.value;
}

<input onChange={handleChange} />

not this

<input onChange={handleChange()} />

Answer 5

Simply do this

<DatePicker selected={this.state.startDate} onChange={this.handleChange}/>

It will pass the event param of the function automatically. The rest of your code is okay.

Answer 6

If you are passing event using an arrow function, you should try the following:

onChange={(e) => handleChange(e)}