我敢打赌,这与异步性有关。
[基本上,我正在检查是否已存在字符串(问题的答案),如果存在,则页面应仅显示一条消息,否则应将新问题添加到数组中。
因此,为了重构代码,我创建了一个名为isDuplicateAnswer
的函数(是的,它已绑定到组件)。这是它的代码:
isDuplicateAnswer() {
if (this.state.answersToCurrentQuestion.length > 0) {
this.state.answersToCurrentQuestion.map(answer => {
if (this.state.answerTextTyped === answer.text) {
console.log("true"); // executed twice but then adds it to the array (not supposed to)
return true;
}
});
}
}
基于此检查,代码将执行以下操作:
if (
event.target.id === "submitAnswer" &&
this.state.answerTextTyped !== null &&
this.isDuplicateAnswer()
) {
console.log("Something is wrong"); // This line is never executed (no log, no message)
return this.props.handleMessage(
"There is already another answer with this text. Please add a different one."
);
} else if (
event.target.id === "submitAnswer" &&
this.state.answerTextTyped !== null &&
!this.isDuplicateAnswer()
) {
console.log("Everything OK"); // not displayed but rest of the code goes through (answer added)
this.setState({ answerText: this.state.answerTextTyped }, () => {
(() => {
let answersToCurrentQuestion = [
...this.state.answersToCurrentQuestion,
];
answersToCurrentQuestion.push({
text: this.state.answerText,
isCorrect: this.state.isCorrectAnswer,
});
this.setState({ answersToCurrentQuestion });
if (this.state.isCorrectAnswer === true) {
this.incrementCorrectAnswers();
}
})();
(() => {
this.props.handleMessage("");
this.setState({
isValid: true,
isCorrectAnswer: false,
answerTextTyped: null,
});
this.refreshAnswerTypedForm();
this.getAnswerTypedForm();
})();
});
}
[我的问题是,如果isDuplicateAnswer
为false
,正如我的日志中所说的“一切都很好”,但是当它返回true
时,将创建答案,由于HTML键不是唯一的,因此导致错误,即使isDuplicateAnswer
中的日志显示两次。
鉴于后卫中的其他两项检查均正常工作,我在这里做错了什么?
编辑
这是单击“添加答案”之前的状态,其ID为submitAnswer