1.7 KiB
1.7 KiB
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Use Array.map() to Dynamically Render Elements |
Use Array.map() to Dynamically Render Elements
Hint 1:
Define the two states as a JavaScript object
.
{object: state, object: state}
Hint 2:
You need .map()
to generate a line for every object in the array.
this.state.toDoList.map(i => <li>{i}</li>);
Solution:
Once you add the map function, you will notice that it will generate a <li>
for every item you put in the list.
const textAreaStyles = {
width: 235,
margin: 5
};
class MyToDoList extends React.Component {
constructor(props) {
super(props);
// change code below this line
this.state = {
userInput: '',
toDoList: []
}
// change code above this line
this.handleSubmit = this.handleSubmit.bind(this);
this.handleChange = this.handleChange.bind(this);
}
handleSubmit() {
const itemsArray = this.state.userInput.split(',');
this.setState({
toDoList: itemsArray
});
}
handleChange(e) {
this.setState({
userInput: e.target.value
});
}
render() {
const items = this.state.toDoList.map(i => <li>{i}</li>); // change code here
return (
<div>
<textarea
onChange={this.handleChange}
value={this.state.userInput}
style={textAreaStyles}
placeholder="Separate Items With Commas" /><br />
<button onClick={this.handleSubmit}>Create List</button>
<h1>My "To Do" List:</h1>
<ul>
{items}
</ul>
</div>
);
}
};