我对jQuery比较陌生。我正在尝试创建一个调查；在调查中，每个问题都在自己的div中，并通过单击"下一步"按钮显示。除了当前的div之外，我只隐藏了所有的div。我正在努力编写对象的答案，以简化代码。有一些问题是用单选按钮、一些文本区域、一些复选框和一些选择来回答的。这是我的代码：
$('.next-button').click(function() {
if ($(this).parent().has('.survey-question-option')) {
replies[$(this).parent().attr('id')] = $(this).parent().contents('.survey-question-option:checked').val();
} else if ($(this).parent().has("textarea")) {
replies[$(this).parent().attr('id')] = $(this).parent().contents("textarea").val();
}
console.log(replies);
$(this).parent().attr('hidden', '');
$(this).parent().next().removeAttr('hidden');
});
我正在记录对象(回复(以确保一切正常。由于代码目前是公式化的，我将前两个问题的答案(都是单选按钮(添加到回复中，但接下来的两个对象(文本区域(填充为未定义。({reason: "bill", wish: "newstart", dislike: undefined, like: undefined}(。我尝试将if语句表述为两个独立的语句：
if ($(this).parent().has('.survey-question-option')) {
replies[$(this).parent().attr('id')] = $(this).parent().contents('.survey-question-option:checked').val();
};
if ($(this).parent().has("textarea")) {
replies[$(this).parent().attr('id')] = $(this).parent().contents("textarea").val();
};
这为单选按钮返回undefined，但两个文本区域的内容显示在对象中。({reason: undefined, wish: undefined, dislike: "dislike text", like: "like text"}(。在我自己做的一些测试中，我已经确定，如果if语句被公式化为if…else if公式总是只应用if语句，但如果它是用两个if语句创建的，它会跳过第一个，直接进入第二个。
我的逻辑是，每个Next按钮都在一个带有响应的div中，所以我应该能够查看Next按钮的父级，找到合适的类，并获得值。无论我如何制定，它似乎只有50%的时间有效
编辑：我附上相关的html部分。
$('.next-button').click(function() {
if ($(this).parent().has('.survey-question-option')) {
replies[$(this).parent().attr('id')] = $(this).parent().contents('.survey-question-option:checked').val();
} else if ($(this).parent().has("textarea")) {
replies[$(this).parent().attr('id')] = $(this).parent().contents("textarea").val();
}
console.log(replies);
$(this).parent().attr('hidden', '');
$(this).parent().next().removeAttr('hidden');
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form id="survey">
<div id="reason" class='radio'>
<p class="survey-question">What is the primary reason you visit the site? </p>
<input type="radio" id="bill" name="reason" class="survey-question-option" value="bill">
<label for="bill" class="survey-question-option-label">To view or pay my bill online</label><br>
<input type="radio" id="outage" name="reason" class="survey-question-option" value="outage">
<label for="outage" class="survey-question-option-label">To view or report an outage</label><br>
<input type="radio" id="start" name="reason" class="survey-question-option" value="start">
<label for="start" class="survey-question-option-label">To get information about starting or stopping services</label><br>
<input type="radio" id="hours" name="reason" class="survey-question-option" value="hours">
<label for="hours" class="survey-question-option-label">To find Frederick Waster's business hours</label><br>
<input type="radio" id="board" name="reason" class="survey-question-option" value="board">
<label for="board" class="survey-question-option-label">To get information about Frederick Water's governance or board meetings</label><br>
<input type="radio" id="devel" name="reason" class="survey-question-option" value="devel">
<label for="devel" class="survey-question-option-label">To get information about new water or wastewater lines for new development</label><br>
<input type="radio" id="other" name="reason" class="survey-question-option" value="other">
<label for="other" class="survey-question-option-label">Other</label><br>
<div id="other-fill-reason" class="other-fill" hidden>
<label for="othertext-reason" class="survey-question-option-label">Please specify: </label>
<input type="text" class="survey-question-other" id="othertext-reason">
</div>
<input type="button" class="next-button" id="reason-next" value="Next">
</div>
<div id="wish" class='radio' hidden>
<p class="survey-question">What do you wish the site did better?</p>
<input type="radio" id="newstart" name="wish" class="survey-question-option" value="newstart">
<label for="newstart" class="survey-question-option-label">Allow me to pay deposit while starting new service</label><br>
<input type="radio" id="outinfo" name="wish" class="survey-question-option" value="outinfo">
<label for="outinfo" class="survey-question-option-label">Provide easier-to-find information about outages</label><br>
<input type="radio" id="startstop" name="wish" class="survey-question-option" value="startstop">
<label for="startstop" class="survey-question-option-label">Make it easier to start and stop services</label><br>
<input type="radio" id="request" name="wish" class="survey-question-option" value="request">
<label for="request" class="survey-question-option-label">Make it easier to request maintenance for existing service</label><br>
<input type="radio" id="chat" name="wish" class="survey-question-option" value="chat">
<label for="chat" class="survey-question-option-label">Let me talk to customer service online</label><br>
<input type="radio" id="other2" name="wish" class="survey-question-option" value="other">
<label for="other2" class="survey-question-option-label">Other</label><br>
<div id="other-fill-wish" class="other-fill" hidden>
<label for="othertext-wish" class="survey-question-option-label">Please specify: </label>
<input type="text" class="survey-question-other" id="othertext-wish">
</div>
<input type="button" class="next-button" id="wish-next" value="Next">
</div>
<div id="dislike" class="textbox" hidden>
<p class="survey-question">What do you dislike about the site?</p>
<textarea id="dislike-text" class="like-dislike" cols="100" rows="5" maxlength="500" wrap="soft"></textarea><br>
<input type="button" class="next-button" id="dislike-next" value="Next">
</div>
<div id="like" class="textbox" hidden>
<p class="survey-question">What do you like about the site?</p>
<textarea id="like-text" class="like-dislike" cols="100" rows="5" maxlength="500" wrap="soft"></textarea><br>
<input type="button" class="next-button" id="like-next" value="Next">
</div>has()不返回布尔值，而是返回一个jQuery对象。物体总是真实的。
如果要测试选择器是否找到任何内容，请测试结果的长度。
$('.next-button').click(function() {
if ($(this).parent().find('.survey-question-option').length > 0) {
replies[$(this).parent().attr('id')] = $(this).parent().find('.survey-question-option:checked').val();
} else if ($(this).parent().find("textarea").length > 0) {
replies[$(this).parent().attr('id')] = $(this).parent().find("textarea").val();
}
console.log(replies);
$(this).parent().attr('hidden', '');
$(this).parent().next().removeAttr('hidden');
});