javascript - 如何在禁用的字段集中启用一个按钮

Question

我想禁用 Fieldset 中的所有元素，但启用其中的几个按钮。 Demo:

<fieldset ng-disabled="true">
    <legend>Personalia:</legend>
    Name: <input type="text"><br>
    Email: <input type="text"><br>
    Date of birth: <input type="text">

    <input type="button" value="See More (Enable this!!) " ng-click="ButtonClicked1()" ng-disabled="false"/>
    Somethingelse: <input type="text">
    <input type="button" value="View Details " ng-click="ButtonClicked2()"/> 
</fieldset>

Answer 1

我有 3 个解决方案:

解决方案 1:<details>和 <summary>

在您的示例中，您可能应该使用 <details> 和 <summary> 元素:

label {
  display: block;
}

<fieldset disabled>
  <legend>
    Personalia:
  </legend>

  <label>Name: <input></label>
  <label>Email: <input></label>
  <label>Date of birth: <input></label>

  <label>Somethingelse: <input></label>

  <details>
    <summary>View Details</summary>
    <p>A more detailed description</p>
  </details>
</fieldset>

解决方案 2:将按钮放在 <legend> 中

如果您没有透露更详细的信息，但您想切换字段集的禁用，那么您可以将切换按钮放在 <legend> element 中。

const fieldset = document.querySelector("fieldset");
const toggleButton = document.getElementById("toggle-button");

toggleButton.addEventListener("click", (event) => {
  fieldset.disabled = !fieldset.disabled;
  toggleButton.textContent = fieldset.disabled ? "Enable" : "Disable";
  toggleButton.setAttribute("aria-pressed", `${!fieldset.disabled}`);
});

label {
  display: block;
}

<fieldset disabled>
  <legend>
    Personalia:
    <button id="toggle-button" aria-pressed="true">
      Enable
    </button>
  </legend>

  <label>Name: <input></label>
  <label>Email: <input></label>
  <label>Date of birth: <input></label>

  <label>Somethingelse: <input></label>
  <button>This may be disabled</button> 
</fieldset>

解决方案 3:使用“假”按钮

如果您的用例完全不同，您可以使用 aria-roles 来“伪造”一个按钮 role="button" (参见 ARIA button role)。请记住添加必要的辅助功​​能，使没有显示屏或鼠标的用户可以点击此按钮。重要的属性是 role="button" (用于屏幕阅读器)和 tabindex="0" (用于键盘导航)，还记得为 keypress 添加处理程序Enter 和 Space 以防您的用户没有鼠标。

const disabledButton = document.querySelector('.disabled-button');
const disabledOutput = document.querySelector('.disabled-output');
const enabledButton = document.querySelector('.enabled-button');
const enabledOutput = document.querySelector('.enabled-output');

function increment(output) {
  const current = Number.parseInt(output.textContent);
  output.textContent = `${current + 1}`;
}

disabledButton.addEventListener('click', () => increment(disabledOutput));
disabledButton.addEventListener('keypress', event => {
  if (['Enter', ' '].includes(event.key)) {
    increment(disabledOutput);
  }
});

enabledButton.addEventListener('click', () => increment(enabledOutput));
enabledButton.addEventListener('keypress', event => {
  if (['Enter', ' '].includes(event.key)) {
    increment(enabledOutput);
  }
});

label {
  display: block;
}

[role="button"] {
  -webkit-appearance: button;
  appearance: button;
  cursor: default;
  font-style: normal;
  -webkit-user-select: none;
  user-select: none;
}

<fieldset disabled>
  <legend>Disabled form elements</legend>

  <label>Input 1<input name="input 1"></label>
  <label>Input 2<input name="input 2"></label>
  
  <button
    class="disabled-button"
    name="disabled-button"
  >
    This is disabled
  </button>

  <i
    class="enabled-button"
    role="button"
    tabindex="0"
  >
    This is enabled
  </i>
</fieldset>

<label>
  Disabled button clicks:
  <output class="disabled-output">0</output>
</label>

<label>
  Enabled button clicks:
  <output class="enabled-output">0</output>
</label>