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该页面上有多个问题/答案集。每个集合都被分组到一个“questionItem”类的 div 中。在每个集合中，总是有一个名为 answers[idx].SetAnser 的输入，并且可能有一个 answers[idx].Answer，其中 idx 是集合的索引。

需要解决的问题是找到所有问题集 div 元素，其中 SetAnswer 为一个值，Answer 为另一个值。这是示例html：

<div class="questionItem format">
    <input name="answers[0].SetAnswer" type="hidden" value="0" />

    <select name="answers[0].Answer">
      <option selected="selected" value="0">(0) No</option>
      <option value="1">(1) Yes</option>
      <option value="-">(-) Not assessed</option>
    </select>
</div>

<div class="questionItem format">
    <input name="answers[1].SetAnswer" type="hidden" value="?" />
    <select name="answers[1].Answer">
        <option selected="selected" value="?">(select item)</option>
        <option value="0">(0) No</option>
        <option value="1">(1) Yes</option>
        <option value="-">(-) Not assessed</option>
    </select>
</div>

<div class="questionItem format">
    <input name="answers[2].SetAnswer" type="hidden" value="?" />
    <input name="answers[2].Answer" type="number" value="" />    
</div>

<div class="questionItem format">
    <input name="answers[3].SetAnswer" type="hidden" value="red" />
    <input name="answers[3].Answer" type="number" value="red" />    
</div>

我能想到的最好的，但不起作用的是这样的：

var answerColl = $(this).find(":input").filter(function () {
    return /^answers\[\d+\]\.Answer$/.test(this.name); 
    });

// Make sure there is an 'Answer' input, if there isn't, that is because it is 
// not displayed, so assume not unanswered
if (answerColl.length > 0) {
    var answerElement = answerColl.first();
    var answer = answerElement.value;

    // First check to see if the answer is ?
    if (answer == "?")
        return true;

    // Next check to see if the answer is empty, if so, must check the setAnswer.  
    // If the setAnswer is ^, then this is no unanswered, if it is ? it is unanswered.
    if (!Boolean(answer)) {

        var setAnswerElement = $(this).find(":input").filter(function () { return /^answers\[\d+\]\.SetAnswer$/.test(this.name); }).first();
        var setAnswer = setAnswerElement.value;

        if (setAnswer == "?")
            return true;
    }
}

return false;

问题在于：

var answerElement = answerColl.first();
var answer = answerElement.value;

当我在调试器中查看它时，answerElement 是一个 jQuery 对象，但 answer 始终为空。查看 answerElement 时，默认值是我正在寻找的值，即实际答案，但我无法弄清楚如何在代码中得到它。

有什么建议么？

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1 回答 1

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我认为您不需要为此编写正则表达式。您只需使用 $.each 循环即可轻松解决此问题。首先选择元素..然后在这些元素上运行 $.each 循环以检查对于你所说的条件..试试这个

$(function() {

    $('#btn1').on('click', function() {
        var correctAnswer = $('.questionItem input');
        var userAnswer = $('.questionItem select option:selected');

        $.each(correctAnswer, function(i) {
            // This will give the Question Div's Whose SetAnswer and Answers are different..
            if ($(this).val() != $(userAnswer[i]).val()) {

                // Will give a List of all Answers that are set
                console.log('Correct Answer for Question ' + i + ' is  : ' + $(this).val());
                // Will give a List of all Answers that the user Answered
                console.log('User Selection for Question ' + i + ' is  : ' + $(userAnswer[i]).val());

                // This will print the Question Div for Which 
                // SetAnswer and Answer is different..
                console.log('SetAnswer is of one value and Answer is of another value for : ' + $(this).parent().attr('id'));
            }
        });
    });

});​

检查此FIDDLE以获取工作示例..

于 2012-09-07T20:01:30.113 回答