选中复选框时降低父级的不透明度

Reducing Opacity of Parent When Checkbox is Checked

本文关键字：不透明度复选框更新时间：2023-09-26

每当选中表中的复选框时，我都会尝试降低表的不透明度(使用 class="test"(。出于某种原因，只有复选框本身会褪色。我不明白我做错了什么。我的代码如下。感谢您的帮助。

table.test input[name="delete_record[]"]:checked {
  opacity: 0.5;
}

<table class="test" cellpadding="10" cellspacing="0" align="center" bgcolor="#9CDEEC" border="0" style="margin-bottom: 16px;border-radius: 4px;border: 1px solid #555555;">
  <!-- Transactions table -->
  <tbody>
    <tr>
      <td>
        <input style="width: 90px;" type="text" class="datepicker" name="date[]" required="" value="01/09/1970">
      </td>
      <td>
        <input type="text" name="payee[]" required="" value="Hateful!">
      </td>
      <td rowspan="2" align="left" valign="top">
        <a title="Memo: They're customer service is astounding.">
          <textarea rows="3" style="text-align: left; border: 1px solid #AAAAAA; width: 200px; background-color: #FFFFFF; padding: 3px;" name="memo[]">They're customer service is astounding.</textarea>
        </a>
      </td>
      <td>
        <select name="reconciled[]">
          <option value="R" selected="selected">R</option>
          <option value=""></option>
          <option value="C">C</option>
          <option value="R">R</option>
        </select>
      </td>
      <td>
        <input style="width: 100px; text-align: right;" type="number" step="0.01" name="deposit[]" size="4" min="0" max="100000000" value="">
      </td>
      <td>
        <input style="width: 100px; text-align: right;" type="number" step="0.01" name="withdrawal[]" size="4" min="0" max="100000000" value="37.00">
      </td>
      <input type="hidden" name="record_id[]" value="95">
      <td rowspan="2" align="center" valign="middle">
        <input type="checkbox" name="delete_record[]" value="95">
      </td>
    </tr>
    <tr>
      <td>
        <input style="width: 60px;" placeholder="Check #" type="number" step="1" min="0" max="1000000000" name="check_number[]" value="110">
      </td>
      <td>
        <select name="category[]" style="width: 200px;">
          <option value="1" selected="selected">Business: Advertising</option>
          <option value="42">Business</option>
          <option value="1">Business: Advertising</option>
          <option value="2">Business: Assets</option>
          <option value="24">Business: Automotive: Auto Insurance</option>
          <option value="25">Business: Automotive: Auto Loan</option>
          <option value="26">Business: Automotive: Repairs</option>
          <option value="27">Business: Automotive: Fuel</option>
          <option value="28">Business: Automotive: Parking and Tolls</option>
          <option value="29">Business: Automotive: Registration</option>
          <option value="30">Business: Automotive: Vehicle Leasing</option>
          <option value="31">Business: Automotive: Wash and Road Services</option>
          <option value="3">Business: Commissions and Fees</option>
          <option value="4">Business: Contract Labor</option>
          <option value="23">Business: H.S.A. Contrbutions</option>
          <option value="22">Business: Health Insurance Premiums</option>
          <option value="10">Business: Home Office Other Expenses</option>
          <option value="12">Business: Home Office Rent and Lease</option>
          <option value="37">Business: Home Office Repairs and Maintenence</option>
          <option value="5">Business: Insurance</option>
          <option value="32">Business: Interest Paid: Business Loan</option>
          <option value="33">Business: Interest Paid: Business Mortgage</option>
          <option value="34">Business: Interest Paid: Credit Card</option>
          <option value="35">Business: Interest Paid: Home Office Mortgage</option>
          <option value="6">Business: Legal and Professional Services</option>
          <option value="7">Business: Materials and Supplies</option>
          <option value="8">Business: Meals and Entertainment</option>
          <option value="9">Business: Office Expenses</option>
          <option value="11">Business: Rent and Lease</option>
          <option value="36">Business: Repairs and Maintenence</option>
          <option value="13">Business: Taxes and Licenses: Licenses</option>
          <option value="14">Business: Taxes and Licenses: Property Tax</option>
          <option value="15">Business: Taxes and Licenses: Estimated Taxes</option>
          <option value="16">Business: Taxes and Licenses: Federal Tax</option>
          <option value="17">Business: Taxes and Licenses: Home Office Property Tax</option>
          <option value="18">Business: Taxes and Licenses: State Tax</option>
          <option value="19">Business: Travel</option>
          <option value="20">Business: Utilities: Utilities</option>
          <option value="21">Business: Utilities: Home Office Utilities</option>
          <option value="43">Personal</option>
          <option value="51">Personal: Automotive</option>
          <option value="52">Personal: Charity and Donations</option>
          <option value="53">Personal: Child Care</option>
          <option value="54">Personal: Clothing</option>
          <option value="55">Personal: Education</option>
          <option value="56">Personal: Entertainment</option>
          <option value="48">Personal: Furnishings</option>
          <option value="63">Personal: Gift</option>
          <option value="44">Personal: Groceries</option>
          <option value="47">Personal: Health and Fitness</option>
          <option value="57">Personal: Home Maintenance and Repairs</option>
          <option value="50">Personal: Insurance</option>
          <option value="58">Personal: Medical</option>
          <option value="59">Personal: Mortgage</option>
          <option value="49">Personal: Pets</option>
          <option value="60">Personal: Property Tax</option>
          <option value="61">Personal: Rent</option>
          <option value="46">Personal: Resturants</option>
          <option value="62">Personal: Travel and Vacation</option>
          <option value="45">Personal: Utilities</option>
          <option value="38">Transfer: Bank to Bank</option>
          <option value="39">Transfer: Credit Card Payment</option>
          <option value="40">Transfer: Owner's Deposit</option>
          <option value="41">Transfer: Owner's Withdrawal</option>
        </select>
      </td>
      <td colspan="3" align="right" valign="middle" style="padding-right: 20px;">
        <!--  Accounts Selector -->
        <select name="bank_account[]">
          <option value="19">Chroot Checking</option>
          <option value="10">Main Checking</option>
          <option value="19">Chroot Checking</option>
        </select>
      </td>
    </tr>
  </tbody>
</table>

由于您无法使用 CSS 更改父级的不透明度，因此需要使用 JavaScript。

document.querySelector('input[name="delete_record[]').addEventListener('click', function() {
    var d = document.querySelector('table.test');
    if(this.checked) {
        d.style.opacity = 0.5;
    } else {
        d.style.opacity = 1;
    }
});

这也切换了不透明度。

这里的例子。

要仅影响父表，并按照@abluejelly的建议使用类进行切换，您可以执行以下操作：

document.querySelector('input[name="delete_record[]').addEventListener('click', function() {
    var d = this.parentNode.parentNode.parentNode; // the table
    d.classList.toggle('halfOpacity', this.checked);
});

你需要一个CSS类：

.halfOpacity {
    opacity: 0.5;
}

为此，才能发挥作用。

这里的例子。

如果您有多个表，则需要尝试如下操作：

var tables = document.querySelectorAll('input[name="delete_record[]');
for(var i = 0, l = tables.length; i < l; i++) {
    tables[i].addEventListener('click', function() {
        var d = this.parentNode.parentNode.parentNode; // the table
        d.classList.toggle('halfOpacity', this.checked);
    });
}

它会循环遍历所有表，并将 Click 事件侦听器分配给复选框。

这里的例子。

每当选中表中的复选框时，这将降低表的不透明度。

var checkboxes = document.querySelectorAll('input[type="checkbox"]');
var table = document.querySelector('table.test');
var oneIsChecked = false;
for(var i=0; i<checkboxes.length; i++){
    checkboxes[i].addEventListener("click", function(e) {
      oneIsChecked = false;
      for(var j=0; j<checkboxes.length; j++){
        if(checkboxes[j].checked) {
          oneIsChecked = true;
          break;
        }
      }
      if(oneIsChecked){
        table.style.opacity = 0.5;
      }else{
        table.style.opacity = 1;
      }
    });
}

table.test input[name="delete_record[]"]:checked

这个选择器说：匹配一个选中的input元素，其name属性设置为"delete_record[]"，即具有类test的table元素的后代。简而言之，这个CSS选择器指的是你的输入元素，而不是你的表元素(它是它的父元素之一(。

对于一个纯粹的基于CSS的解决方案，你需要一个"has-descendant"或"has-child"运算符，不幸的是，CSS3不支持该运算符。因此，您需要求助于 JavaScript 并观察输入何时发生变化，然后以编程方式设置不透明度(或任何您需要的内容(：

document.querySelector('input[name="delete_record[]"]')[0].addEventListener('change', function () {
    var tableElement = document.querySelector('table.test')[0];
    if (this.checked) {
        tableElement.style.opacity = 0.5;
    } else {
        tableElement.style.opacity = 1;
    }
});

当然，您还需要将初始表不透明度与输入的初始检查状态相匹配。

但请注意，从视觉角度来看，不透明度是有效的继承的。

您的复选框只会褪色，因为这是您的 CSS 选择器的目标。

不幸的是，CSS不能做你所要求的。您只能定位前面有其他元素的元素，而不能定位后面的元素。

可以使用其他方法有条件地将类应用于表并相应地设置其样式。 jQuery是一个简单的解决方案，但最佳选择取决于您使用的语言。

您也可以简单地使用 CSS 进行操作，请按照以下说明操作：

步骤#1：将以下代码复制并粘贴到单独的文件中以查看结果，然后将其用于自己的目的。

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #001925;
}
.list {
    padding: 30px 75px 10px 30px;
    position: relative;
    background: #042b3e;
    border-top: 50px solid #03a9f4;
}
.list h2 {
    color: #fff;
    font-size: 30px;
    padding: 10px 0;
    margin-left: 10px;
    display: inline-block;
    border-bottom: 4px solid #fff;
}
.list label {
    position: relative;
    display: block;
    margin: 40px 0;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
}
.list input[type="checkbox"] {
    -webkit-appearance: none;
}
.list i {
    position: absolute;
    top: 0;
    display: inline-block;
    width: 25px;
    height: 25px;
    border: 2px solid #fff;
    left: 0;
}
.list input[type="checkbox"]:checked ~ i {
    top: 1px;
    border-top: none;
    border-right: none;
    height: 15px;
    width: 25px;
    transform: rotate(-45deg);
}
.list span {
    position: relative;
    left: 40px;
    transition: 0.5s;
}
.list span:before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    background: #fff;
    transform: translateY(-50%) scaleX(0);
    transform-origin: right;
    transition: transform 0.5s;
}
.list input[type="checkbox"]:checked ~ span:before {
    transform: translateY(-50%) scaleX(1);
    transform-origin: left;
    transition: transform 0.5s;
}
.list input[type="checkbox"]:checked + span {
    opacity: 0.2;
    transform: translateY(-50%) scaleX(1);
    transform-origin: left;
    transition: transform 0.5s;
}
input[type=checkbox] + label {
    color: #ccc;
    font-style: italic;
}
input[type=checkbox]:checked + label {
    color: #f00;
    font-style: normal;
    opacity: 0.2;
}

<DOCTYPE HTML>
    <html>
    <head>
        <meta charset="utf-8">
        <title>Check List</title>
    </head>
    <body>
        <div class="list">
            <h2>Check list in HTML & CSS</h2>
            <label>
                <input type="checkbox" name="">
                <span>HTML stand for Hyper text markup language</span>
                <i></i>
            </label>
        </div>
    </body>
    </html>

在jQuery中，你可以做类似的事情

if ($('input[name="delete_record[]"]').is(':checked')) {
    $('table.test').css('opacity', 0.5);
}

$('input[name="delete_record[]"]').click(function(){
    $(this).is(':checked')) {
        $('table.test').css('opacity', 0.5);
    }
});