嵌套的ngFor选择不可点击

问题描述 投票:0回答:2

我正在使用ngFor提出问题,在那些问题中,我正在使用另一个ngFor来显示每个答案旁边的单选按钮的posibble答案。

一切都是正确生成的,如果我在第一个问题中点击任何答案的收音机,一切顺利。

当我尝试点击第二个问题的答案时,问题就出现了,如果我点击其中任何一个问题,就会检查第一个问题的单选按钮。

这是我现在的代码。

<div id="question{{questionInd}}" class="card bg-blue-grey bg-lighten-5" *ngFor="let question of focusGroup.aptitudeTest.questions; let questionInd = index">
    <div class="card-header"><span class="text-bold-500 primary">¿{{question.question}}?</span></div>
    <div class="card-body">
        <div class="card-block">
            <div *ngFor="let answer of question.answers; let answerInd = index" class="custom-control custom-radio custom-control-inline">
                <input type="radio" id="answer{{answerInd}}" [value]="answer.answer" name="desiredAnswerRadio{{questionInd}}" class="custom-control-input" (change)="desiredAnswer(question, answer)">
                <label class="custom-control-label" for="answer{{answerInd}}">
                    <span class="display-block"><i class="ft-minus"></i> {{answer.answer}}</span>
                </label>
            </div>
        </div>
    </div>
</div>

以下图片是我之前解释过的视觉指南。

Questions and answers displayed

This happened when I clicked the answer Yes

This happened when I clicked the answer Certainly not

编辑:

根据要求,这是desiredAnswer方法。

desiredAnswer(question: ITestQuestion, desiredAnswer: ITestAnswerOption) {
    question.answers.forEach(function(answer: ITestAnswerOption) {
        answer.desired = false;
    });
    desiredAnswer.desired = true;
    console.log(question.answers);
}

由于我只需要一个答案,并且每个单选按钮都使用ngModel链接到答案的属性,因此在方法中我将all设置为false,然后将所需的一个设置为true。

angular ngfor
2个回答
0
投票

您需要考虑javascript对象范围。在desiredAnswer函数question.answers.forEach(function(answer: ITestAnswerOption) {中,answer: ITestAnswerOption对象与您传递给函数设置desiredAnswer.desired = true;的对象不同,因此函数应该看起来像这样

desiredAnswer(question: ITestQuestion, desiredAnswer: ITestAnswerOption) {
  question.answers.forEach(function(answer: ITestAnswerOption) {
    if (desiredAnswer == answer) answer.desired = true;
    else answer.desired = false;
  });
  console.log(question.answers);
}

0
投票

说实话,我不知道为什么这解决了它,但我刚改变了这一行:

<input type="radio" id="answer{{answerInd}}" [value]="answer.answer" name="desiredAnswerRadio{{questionInd}}" class="custom-control-input" (change)="desiredAnswer(question, answer)">

对此:

<input type="radio" id="answer{{answer.id}}" name="desiredAnswerRadio{{question.id}}" class="custom-control-input" (change)="desiredAnswer(question, answer)">

现在它工作得很好,我可以点击两个问题的单选按钮。

Both questions answered

刚想通了,我用嵌套ngfor的索引设置每个无线电的id,但是它重复了每个新问题,因为嵌套的ngfor的索引再次从0开始。因此为什么使用每个答案的id立即工作。

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