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我尝试了下面的 html 代码来制作标签集：

<section id="dynamic-demo-toolbar">
  <nav id="dynamic-tab-bar" class="mdc-tab-bar" role="tablist">
    <a role="tab" aria-controls="panel-1"
       class="mdc-tab mdc-tab--active" href="#panel-1">Item One</a>
    <a role="tab" aria-controls="panel-2"
       class="mdc-tab" href="#panel-2">Item Two</a>
    <a role="tab" aria-controls="panel-3"
       class="mdc-tab" href="#panel-3">Item Three</a>
    <span class="mdc-tab-bar__indicator"></span>
  </nav>
</section>
<section>
  <div class="panels">
    <p class="panel active" id="panel-1" role="tabpanel" aria-hidden="false">Item One</p>
    <p class="panel" id="panel-2" role="tabpanel" aria-hidden="true">Item Two</p>
    <p class="panel" id="panel-3" role="tabpanel" aria-hidden="true">Item Three</p>
  </div>
  <div class="dots">
    <a class="dot active" data-trigger="panel-1" href="#panel-1"></a>
    <a class="dot" data-trigger="panel-2" href="#panel-2"></a>
    <a class="dot" data-trigger="panel-3" href="#panel-3"></a>
  </div>
</section>

JavaScript 是：

<script>
var dynamicTabBar = window.dynamicTabBar = new mdc.tabs.MDCTabBar(document.querySelector('#dynamic-tab-bar'));
var dots = document.querySelector('.dots');
var panels = document.querySelector('.panels');

dynamicTabBar.tabs.forEach(function(tab) {?
  tab.preventDefaultOnClick = true;
});

function updateDot(index) {
  var activeDot = dots.querySelector('.dot.active');
  if (activeDot) {
    activeDot.classList.remove('active');
  }
  var newActiveDot = dots.querySelector('.dot:nth-child(' + (index + 1) + ')');
  if (newActiveDot) {
    newActiveDot.classList.add('active');
  }
}

function updatePanel(index) {
  var activePanel = panels.querySelector('.panel.active');
  if (activePanel) {
    activePanel.classList.remove('active');
  }
  var newActivePanel = panels.querySelector('.panel:nth-child(' + (index + 1) + ')');
  if (newActivePanel) {
    newActivePanel.classList.add('active');
  }
}

dynamicTabBar.listen('MDCTabBar:change', function ({detail: tabs}) {
  var nthChildIndex = tabs.activeTabIndex;

  updatePanel(nthChildIndex);
  updateDot(nthChildIndex);
});

dots.addEventListener('click', function (evt) {
  if (!evt.target.classList.contains('dot')) {
    return;
  }

  evt.preventDefault();

  var dotIndex = [].slice.call(dots.querySelectorAll('.dot')).indexOf(evt.target);

  if (dotIndex >= 0) {
    dynamicTabBar.activeTabIndex = dotIndex;
  }

  updatePanel(dotIndex);
  updateDot(dotIndex);
});
const MDCTab = mdc.tabs.MDCTab;
const MDCTabFoundation = mdc.tabs.MDCTabFoundation;

const MDCTabBar = mdc.tabs.MDCTabBar;
const MDCTabBarFoundation = mdc.tabs.MDCTabBarFoundation;
mdc.tabs.MDCTabBar.attachTo(document.querySelector('#my-mdc-tab-bar'));
</script>

请帮助我...问题出在哪里，我该如何解决？实际上 Material.io 没有为任何组件提供示例完整代码。这就是为什么我完全糊涂了。我正在制作一个聊天应用程序，其中需要标签。所以，我想你们可以帮助我。如果可能，请提供任何 codepend 或 jsfiddle 演示代码...

4

1 回答 1

1

删除?此行中的符号：

dynamicTabBar.tabs.forEach(function(tab) {?

并添加一些 CSS 默认隐藏非活动panel块：

var dynamicTabBar = window.dynamicTabBar = new mdc.tabs.MDCTabBar(document.querySelector('#dynamic-tab-bar'));
var dots = document.querySelector('.dots');
var panels = document.querySelector('.panels');

dynamicTabBar.tabs.forEach(function(tab) {
  tab.preventDefaultOnClick = true;
});

function updateDot(index) {
  var activeDot = dots.querySelector('.dot.active');
  if (activeDot) {
    activeDot.classList.remove('active');
  }
  var newActiveDot = dots.querySelector('.dot:nth-child(' + (index + 1) + ')');
  if (newActiveDot) {
    newActiveDot.classList.add('active');
  }
}

function updatePanel(index) {
  var activePanel = panels.querySelector('.panel.active');
  if (activePanel) {
    activePanel.classList.remove('active');
  }
  var newActivePanel = panels.querySelector('.panel:nth-child(' + (index + 1) + ')');
  if (newActivePanel) {
    newActivePanel.classList.add('active');
  }
}

dynamicTabBar.listen('MDCTabBar:change', function ({detail: tabs}) {
  var nthChildIndex = tabs.activeTabIndex;

  updatePanel(nthChildIndex);
  updateDot(nthChildIndex);
});

dots.addEventListener('click', function (evt) {
  if (!evt.target.classList.contains('dot')) {
    return;
  }

  evt.preventDefault();

  var dotIndex = [].slice.call(dots.querySelectorAll('.dot')).indexOf(evt.target);

  if (dotIndex >= 0) {
    dynamicTabBar.activeTabIndex = dotIndex;
  }

  updatePanel(dotIndex);
  updateDot(dotIndex);
});
const MDCTab = mdc.tabs.MDCTab;
const MDCTabFoundation = mdc.tabs.MDCTabFoundation;

const MDCTabBar = mdc.tabs.MDCTabBar;
const MDCTabBarFoundation = mdc.tabs.MDCTabBarFoundation;
mdc.tabs.MDCTabBar.attachTo(document.querySelector('#my-mdc-tab-bar'));
.panel {
  display: none;
}

.panel.active {
  display: block
}

.dot {
  width: 10px;
  height: 10px;
  display: inline-block;
  background: black;
  padding: 5px;
}

.dots {
  text-align: center;
}

.dot.active {
  background: red;
}
<script src="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.js"></script>
<link href="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.css" rel="stylesheet"/>
<section id="dynamic-demo-toolbar">
  <nav id="dynamic-tab-bar" class="mdc-tab-bar" role="tablist">
    <a role="tab" aria-controls="panel-1"
       class="mdc-tab mdc-tab--active" href="#panel-1">Item One</a>
    <a role="tab" aria-controls="panel-2"
       class="mdc-tab" href="#panel-2">Item Two</a>
    <a role="tab" aria-controls="panel-3"
       class="mdc-tab" href="#panel-3">Item Three</a>
    <span class="mdc-tab-bar__indicator"></span>
  </nav>
</section>
<section>
  <div class="panels">
    <p class="panel active" id="panel-1" role="tabpanel" aria-hidden="false">Item One</p>
    <p class="panel" id="panel-2" role="tabpanel" aria-hidden="true">Item Two</p>
    <p class="panel" id="panel-3" role="tabpanel" aria-hidden="true">Item Three</p>
  </div>
  <div class="dots">
    <a class="dot active" data-trigger="panel-1" href="#panel-1"></a>
    <a class="dot" data-trigger="panel-2" href="#panel-2"></a>
    <a class="dot" data-trigger="panel-3" href="#panel-3"></a>
  </div>
</section>

于 2018-07-28T01:04:40.683 回答