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懂jQuery UI跟ARIA的前辈帮忙指点下

发布时间： 2013-10-02 13:10:38 作者： rapoo

懂jQuery UI和ARIA的前辈帮忙指点下！
下面有两段代码，全部来自jQuery UI官方，帮忙的前辈可以复制为HTML测试，一段是TAB标签选择夹的，一段是MENU菜单的。
首先TAB例子中，我只想问的是

引用
tabs.delegate( "span.ui-icon-close", "click", function() {
var panelId = $( this ).closest( "li" ).remove().attr( "aria-controls" );
$( "#" + panelId ).remove();
tabs.tabs( "refresh" );
});

这一段，在HTML中有这么一句：
引用
tabTemplate = "<li><a href='#{href}'>#{label}</a> <span class='ui-icon ui-icon-close' role='presentation'>Remove Tab</span></li>"

每个TAB标签上都添加了个关闭的SPAN，并且有个属性 role='presentation'，然后通过上面那句 .attr( "aria-controls" ) 就能找到 panelId 了，这个我查了下是ARIA，是什么盲人等障碍阅读弄出来的，但是看资料看的更晕了，希望哪位前辈通俗的给讲讲呗。。。

然后就是下段MENU菜单的例子了，这个没什么要问的，根据上面的ARIA功能，点某个关闭按钮就能关闭掉对应的TAB标签的话，那么我试想，菜单的项目对应到TAB标签上，点击菜单的某个项目，如果该TAB不存在，就利用第一段代码中的addtab方法添加并激活它；如果存在，就自动切换到该TAB激活。
这个功能其实用常规的思维，利用HTML元素的属性，加上jQuery一些函数，通过查找判断我想我差不多可以写出来，但是感觉太麻烦，并且也没有ARIA好，所以我希望前辈给演示下，如何实现我前面说的点菜单项目的功能，谢谢！

通过ARIA将上述功能实现了就给分，但是我希望最好在您有时间的情况下给我通俗的讲解下ARIA，多谢！

这是TAB选项卡的代码：

<!doctype html>
 
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>jQuery UI Tabs - Simple manipulation</title>
  <link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
  <script src="http://code.jquery.com/jquery-1.9.1.js"></script>
  <script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
  <link rel="stylesheet" href="/resources/demos/style.css" />
  <style>
  #dialog label, #dialog input { display:block; }
  #dialog label { margin-top: 0.5em; }
  #dialog input, #dialog textarea { width: 95%; }
  #tabs { margin-top: 1em; }
  #tabs li .ui-icon-close { float: left; margin: 0.4em 0.2em 0 0; cursor: pointer; }
  #add_tab { cursor: pointer; }
  </style>
  <script>
  $(function() {
    var tabTitle = $( "#tab_title" ),
      tabContent = $( "#tab_content" ),
      tabTemplate = "<li><a href='#{href}'>#{label}</a> <span class='ui-icon ui-icon-close' role='presentation'>Remove Tab</span></li>",
      tabCounter = 2;
 
    var tabs = $( "#tabs" ).tabs();
 
    // modal dialog init: custom buttons and a "close" callback reseting the form inside
    var dialog = $( "#dialog" ).dialog({
      autoOpen: false,
      modal: true,
      buttons: {
        Add: function() {
          addTab();
          $( this ).dialog( "close" );
        },
        Cancel: function() {
          $( this ).dialog( "close" );
        }
      },
      close: function() {
        form[ 0 ].reset();
      }
    });
 
    // addTab form: calls addTab function on submit and closes the dialog
    var form = dialog.find( "form" ).submit(function( event ) {
      addTab();
      dialog.dialog( "close" );
      event.preventDefault();
    });
 
    // actual addTab function: adds new tab using the input from the form above
    function addTab() {
      var label = tabTitle.val() || "Tab " + tabCounter,
        id = "tabs-" + tabCounter,
        li = $( tabTemplate.replace( /#\{href\}/g, "#" + id ).replace( /#\{label\}/g, label ) ),
        tabContentHtml = tabContent.val() || "Tab " + tabCounter + " content."; 
 
 
      tabs.find( ".ui-tabs-nav" ).append( li );
      tabs.append( "<div id='" + id + "'><p>" + tabContentHtml + "</p></div>" );
      tabs.tabs( "refresh" );
      tabCounter++;
    }
 
    // addTab button: just opens the dialog
    $( "#add_tab" )
      .button()
      .click(function() {
        dialog.dialog( "open" );
      });
 
    // close icon: removing the tab on click
    tabs.delegate( "span.ui-icon-close", "click", function() {
      var panelId = $( this ).closest( "li" ).remove().attr( "aria-controls" );
      $( "#" + panelId ).remove();
      tabs.tabs( "refresh" );
    });
 
    tabs.bind( "keyup", function( event ) {
      if ( event.altKey && event.keyCode === $.ui.keyCode.BACKSPACE ) {
        var panelId = tabs.find( ".ui-tabs-active" ).remove().attr( "aria-controls" );
        $( "#" + panelId ).remove();
        tabs.tabs( "refresh" );
      }
    });
  });
  </script>
</head>
<body>
 
<div id="dialog" title="Tab data">
  <form>
    <fieldset class="ui-helper-reset">
      <label for="tab_title">Title</label>
      <input type="text" name="tab_title" id="tab_title" value="" class="ui-widget-content ui-corner-all" />
      <label for="tab_content">Content</label>
      <textarea name="tab_content" id="tab_content" class="ui-widget-content ui-corner-all"></textarea>
    </fieldset>
  </form>
</div>
 
<button id="add_tab">Add Tab</button>
 
<div id="tabs">
  <ul>
    <li><a href="#tabs-1">Nunc tincidunt</a> <span class="ui-icon ui-icon-close" role="presentation">Remove Tab</span></li>
  </ul>
  <div id="tabs-1">
    <p>Proin elit arcu, rutrum commodo, vehicula tempus, commodo a, risus. Curabitur nec arcu. Donec sollicitudin mi sit amet mauris. Nam elementum quam ullamcorper ante. Etiam aliquet massa et lorem. Mauris dapibus lacus auctor risus. Aenean tempor ullamcorper leo. Vivamus sed magna quis ligula eleifend adipiscing. Duis orci. Aliquam sodales tortor vitae ipsum. Aliquam nulla. Duis aliquam molestie erat. Ut et mauris vel pede varius sollicitudin. Sed ut dolor nec orci tincidunt interdum. Phasellus ipsum. Nunc tristique tempus lectus.</p>
  </div>
</div>
 
 
</body>
</html>


这是MENU菜单的代码：

<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>jQuery UI Menu - Default functionality</title>
  <link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
  <script src="http://code.jquery.com/jquery-1.9.1.js"></script>
  <script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
  <link rel="stylesheet" href="/resources/demos/style.css" />
  <script>
  $(function() {
    $( "#menu" ).menu();
  });
  </script>
  <style>
  .ui-menu { width: 150px; }
  </style>
</head>
<body>
 
<ul id="menu">
  <li class="ui-state-disabled"><a href="#">Aberdeen</a></li>
  <li><a href="#">Ada</a></li>
  <li><a href="#">Adamsville</a></li>
  <li><a href="#">Addyston</a></li>
  <li> 
 
    <a href="#">Delphi</a>
    <ul>
      <li class="ui-state-disabled"><a href="#">Ada</a></li>
      <li><a href="#">Saarland</a></li>
      <li><a href="#">Salzburg</a></li>
    </ul>
  </li>
  <li><a href="#">Saarland</a></li>
  <li>
    <a href="#">Salzburg</a>
    <ul>
      <li>
        <a href="#">Delphi</a>
        <ul>
          <li><a href="#">Ada</a></li>
          <li><a href="#">Saarland</a></li>
          <li><a href="#">Salzburg</a></li>
        </ul>
      </li>
      <li>
        <a href="#">Delphi</a>
        <ul>
          <li><a href="#">Ada</a></li>
          <li><a href="#">Saarland</a></li>
          <li><a href="#">Salzburg</a></li>
        </ul>
      </li>
      <li><a href="#">Perch</a></li>
    </ul>
  </li>
  <li class="ui-state-disabled"><a href="#">Amesville</a></li>
</ul>
 
 
</body>
</html>

[解决办法]
refresh: function() {
.....
this._processTabs();
.....

}


_processTabs: function() {
var that = this;

this.tablist = this._getList()
.addClass( "ui-tabs-nav ui-helper-reset ui-helper-clearfix ui-widget-header ui-corner-all" )
.attr( "role", "tablist" );

this.tabs = this.tablist.find( "> li:has(a[href])" )
.addClass( "ui-state-default ui-corner-top" )
.attr({
role: "tab",
tabIndex: -1
});

this.anchors = this.tabs.map(function() {
return $( "a", this )[ 0 ];
})
.addClass( "ui-tabs-anchor" )
.attr({
role: "presentation",
tabIndex: -1
});

this.panels = $();

this.anchors.each(function( i, anchor ) {
var selector, panel, panelId,
anchorId = $( anchor ).uniqueId().attr( "id" ),
tab = $( anchor ).closest( "li" ),
originalAriaControls = tab.attr( "aria-controls" );

// inline tab
if ( isLocal( anchor ) ) {
selector = anchor.hash;
panel = that.element.find( that._sanitizeSelector( selector ) );
// remote tab
} else {
panelId = that._tabId( tab );
selector = "#" + panelId;
panel = that.element.find( selector );
if ( !panel.length ) {
panel = that._createPanel( panelId );
panel.insertAfter( that.panels[ i - 1 ] 
[解决办法]
 that.tablist );
}
panel.attr( "aria-live", "polite" );
}

if ( panel.length) {
that.panels = that.panels.add( panel );
}
if ( originalAriaControls ) {
tab.data( "ui-tabs-aria-controls", originalAriaControls );
}
tab.attr({
"aria-controls": selector.substring( 1 ),
"aria-labelledby": anchorId
});
panel.attr( "aria-labelledby", anchorId );
});

this.panels
.addClass( "ui-tabs-panel ui-widget-content ui-corner-bottom" )
.attr( "role", "tabpanel" ); 
 
},

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