[英]Displaying div based on dynamic boolean angular
從 ngFor 內的反應形式獲取輸入,我必須根據用戶答案與 execution.question.answer 值的比較來顯示“正確”或“不正確”。
我的想法是被動地創建一個布爾值,但我正在努力執行。 每次創建這些數組時,我都無法將數組 a 的索引 [x] 與數組 b 的索引 [x] 進行比較。
這是模板:
<form
fxLayout="column"
fxLayoutGap="2px"
[formGroup]="exerciseForm"
(ngSubmit)="onSubmit(exerciseForm.value)"
>
<ul *ngFor="let exercise of exercises">
<li>{{ exercise.instruction }}</li>
<ul *ngFor="let question of exercise.questions; let i = index">
<li>
{{ question.prefix }}
<mat-form-field>
<input
name="answer"
type="text"
id="answer"
matInput
[formControlName]="question.id"
/>
</mat-form-field>
{{ question.sufix }} -
{{ question.translation }}
<div *ngIf="isAnswered">
<div *ngIf="isCorrect"><p>Correct</p></div>
<div *ngIf="!isCorrect"><p>Incorrect</p></div>
</div>
</li>
</ul>
</ul>
<button type="submit" mat-raised-button color="primary">Submit</button>
</form>
這是 ts(它包含我一直在嘗試的一些方法)
export class ExerciseTestsComponent implements OnInit {
exerciseForm: FormGroup;
isAnswered: boolean;
isCorrect: boolean;
exercises: Exercise[] = [
new Exercise("Answer this question", [
new Question(1, "Eu", "maluco", "I am crazy", "sou"),
new Question(2, "Eu", "doidinho", "I am cuckoo", "estou")
])
];
constructor(private fb: FormBuilder) {}
ngOnInit(): void {
this.createGroup();
}
getAnswersArray() {}
createGroup() {
this.exerciseForm = this.fb.group({});
this.exercises[0].questions.forEach(control =>
this.exerciseForm.addControl(control.id.toString(), this.fb.control(""))
);
}
onSubmit(answer: TestAnswer) {
this.isAnswered=true;
//** 1
let answers = [];
let answersInput = [];
this.exercises[0].questions.forEach(pergunta => {
//** 2
answers.push(pergunta.answer);
console.log(answers);
});
//** 3
var bosta = Object;
bosta = this.exerciseForm.value;
console.log(bosta[1]);
if ((answers[1] = bosta[1])) {
console.log("pqp");
}
let incoming = this.exerciseForm.value;
for (var o in incoming) {
answersInput.push(incoming[o]);
console.log(answersInput);
}
answersInput.forEach(a1 =>
answers.forEach(a2 => {
if (a1 === a2) {
console.log("yay");
} else {
console.log("boo");
}
})
);
}
}
//** for every object created, I have to check if answer = */
堆棧閃電戰: https ://stackblitz.com/edit/angular-dzzzzql
然后當你提交時,你可以比較兩個答案
onSubmit(answer: Answer) {
let answers = [];
console.log(this.exercises)
let answersInput = []
this.exercises[0].questions.forEach((pergunta, index) => {
answers.push(pergunta.answer)
console.log(answers)
return answers
})
let i = 0;
for (const field in this.exerciseForm.controls) { // 'field' is a string
console.log(this.exerciseForm.controls[field].value == answers[i]);
i++;
}
}
Stackblitz 中的工作演示
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