问题
I am not sure how to add a delete function in a FlatList. I know I can make different components, but I want to know how to do it within this one file. I've trying to figure this out for hours, but do not know how to do.
export default function test() {
const [enteredGoal, setEnteredGoal] = useState("");
const [courseGoals, setCourseGoals] = useState([]);
const goalInput = enteredText => {
setEnteredGoal(enteredText);
};
const addGoal = () => {
setCourseGoals(currentGoals => [
...currentGoals,
{ key: Math.random().toString(), value: enteredGoal }
]);
};
const removeGoal = goalId => {
setCourseGoals(currentGoals => {
return currentGoals.filter((goal) => goal.id !== goalId);
})
}
return (
<View style={styles.container}>
<View>
<TextInput
color="lime"
style={styles.placeholderStyle}
placeholder="Type here"
placeholderTextColor="lime"
onChangeText={goalInput}
value={enteredGoal}
/>
</View>
<FlatList
data={courseGoals}
renderItem={itemData => (
<View style={styles.listItem} >
<Text style={{ color: "lime" }}>{itemData.item.value}</Text>
</View>
)}
/>
<View>
<TouchableOpacity>
<Text style={styles.button} onPress={addGoal}>
Add
</Text>
</TouchableOpacity>
</View>
</View>
);
}
回答1:
You just need to modify your code a bit to handle the delete button. Since you already have delete functionality, call that function when you click the delete button. That's it.
<FlatList
data={courseGoals}
renderItem={itemData => (
<View style={{ flexDirection: "row", justifyContent: "space-between" }}>
<Text style={{ color: "lime" }}>{itemData.item.value}</Text>
<TouchableOpacity onPress={() => removeGoal(itemData.item.key)}>
<Text>Delete</Text>
</TouchableOpacity>
</View>
)}
/>;
EDIT
change your removeGoal
function as below
const removeGoal = goalId => {
setCourseGoals(courseGoals => {
return courseGoals.filter(goal => goal.key !== goalId);
});
};
Hope this helps you. Feel free for doubts.
来源:https://stackoverflow.com/questions/59907433/how-to-implement-a-way-to-delete-an-item-from-a-flatlist