jquery - 使用 jQuery 检查特定类的所有输入是否为空

Question

我正在尝试检查特定类的所有输入字段是否为空。现在我有以下代码:

HTML

<input type="text" class="required-entry">
<input type="text" class="required-entry">
<input type="text" class="required-entry">
<button class="check-fields">Check Fields</button>

jQuery

$('.check-fields').on('click', function () {

  var value = $('.required-entry').filter(function () {
    return this.value != '';
  });

  if (value.length == 0) {
    alert('Please fill out all required fields.');
  } else if (value.length > 0) {
    alert('Everything has a value.');
  }
});

但这会抛出消息“一切都有值(value)”。如果任何一个输入有值。我试图仅在此类的每个输入都包含某些内容时才抛出该消息。

$('.check-fields').on('click', function () {

    var value = $('.required-entry').filter(function () {
        return this.value != '';
    });

    if (value.length == 0) {
        console.log('Please fill out all required fields.');
    } else if (value.length > 0) {
        console.log('Everything has a value.');
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" class="required-entry">
<input type="text" class="required-entry">
<input type="text" class="required-entry">
<button class="check-fields">Check Fields</button>

我也有这个 fiddle ，其代码略有不同。当第一个输入是唯一填充的输入时，也会抛出“一切都有值”消息。

$('.check-fields').on('click', function () {
    
    if($.trim($('.required-entry').val()) === '') {
        console.log('Please fill out all required fields.');
    } else {
        console.log('Everything has a value.');
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" class="required-entry">
<input type="text" class="required-entry">
<input type="text" class="required-entry">
<button class="check-fields">Check Fields</button>

Answer 1

检查以下代码:

$('.check-fields').on('click', function () {

    var reqlength = $('.required-entry').length;
    console.log(reqlength);
    var value = $('.required-entry').filter(function () {
        return this.value != '';
    });

    if (value.length>=0 && (value.length !== reqlength)) {
        alert('Please fill out all required fields.');
    } else {
        alert('Everything has a value.');
    }
});