[英]How to remove JSX element from array in React.js?
I have an array of sections in state which holds some list of JSX elements.我在 state 中有一组部分,其中包含一些 JSX 元素列表。 I'm trying to delete a specific element which is JSX from array when clicked on button but I can't figure out how to do this.
我试图在单击按钮时从数组中删除一个特定的 JSX 元素,但我不知道如何做到这一点。 Any help would be appreciated.
任何帮助,将不胜感激。
Section.js Section.js
class Section extends React.Component {
state = {
sections: []
};
addLectureHandler = () => {
const secs = this.state.sections;
secs.push(
<LectureItem key={Math.random} removeLectureHandler={() => this.removeLectureHandler(<LectureItem />)} />
);
this.setState({ sections: secs });
};
removeLectureHandler = (item) => {
console.log(item);
};
render() {
const { classes } = this.props;
return (
<div className={classes.container}>
<h4 className={classes.sectionTitle}>
Section 1 - <AssignmentIcon /> Introduction
</h4>
<div className={classes.addButtonContainer}>
<Button variant="outlined" className={classes.addButton} onClick={this.addLectureHandler}>
Create Lecture
</Button>
</div>
<div className={classes.lectureContainer}>{this.state.sections}</div>
</div>
);
}
}
export default withStyles(styles)(Section);
LectureItem.js LectureItem.js
class LectureItem extends React.Component {
render() {
const { classes, removeLectureHandler } = this.props;
return (
<div className={classes.container}>
<div className={classes.titleContainer}>
<TextField className={classes.textField} label="New Lecture Title" name="lecture" margin="normal" />
<Button className={classes.removeButton} onClick={removeLectureHandler}>
<ClearIcon />
</Button>
</div>
<Button variant="contained" color="primary" className={classes.button}>
Add
</Button>
</div>
);
}
}
export default withStyles(styles)(LectureItem);
Its quite straight forward, its more of a logic statement rather than react, Let me show it to you它非常直截了当,它更像是一个逻辑陈述而不是反应,让我给你看
For you method addLectureHandler
change push command to the following对于您的方法
addLectureHandler
将推送命令更改为以下
secs.push(
<LectureItem key={Math.random} removeLectureHandler={() => this.removeLectureHandler(secs.length)} />
);
You were passing <LectureItem />
which is new element not the one you are pushing, so We will pass length (the actual new index of this element).您正在传递
<LectureItem />
这是新元素而不是您要推送的元素,因此我们将传递长度(该元素的实际新索引)。
Next change you removeLectureHandler
to this接下来将您的
removeLectureHandler
更改为此
removeLectureHandler = (indexToDelete) => {
console.log(indexToDelete);
const secs = this.state.sections;
secs.splice(indexToDelete, 1);
this.setState({ sections: secs });
};
And you have successfully deleted an element from the Sections and UI:-0并且您已成功从 Sections 和 UI 中删除了一个元素:-0
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