下拉指令绑定文档上的单击事件,但是当您单击行时,事件开始从目标元素向下传播到根文档节点(td
-> tr
-> table
-> document
)。
所以这就是为什么你的ng-click
处理程序,你在你的行上,总是被调用,即使指令在文档点击时“停止”气泡。
解决方案是在为文档添加点击处理程序时使用useCapture标志。
启动捕获后,指定类型的所有事件将被分派到注册的侦听器,然后再分派到 DOM 树中它下面的任何 EventTarget。mdn
现在,要指示下拉指令使用您自己的处理程序,您需要更改指令的来源。但这是第三方指令,出于可维护性的原因,您可能不想这样做。
这就是强大的角度 $decorator 发挥作用的地方。您可以使用 $decorator 即时更改第三方模块的源代码,而无需实际接触实际的源文件。
因此,使用装饰器并在文档节点上使用自定义事件处理程序,这就是您可以使该下拉列表行为的方式:
FIDDLE
var myApp = angular.module('myApp', []);
/**
* Original dropdownToggle directive from ui-bootstrap.
* Nothing changed here.
*/
myApp.directive('dropdownToggle', ['$document', '$location', function ($document, $location) {
var openElement = null,
closeMenu = angular.noop;
return {
restrict: 'CA',
link: function(scope, element, attrs) {
scope.$watch('$location.path', function() { closeMenu(); });
element.parent().bind('click', function() { closeMenu(); });
element.bind('click', function (event) {
var elementWasOpen = (element === openElement);
event.preventDefault();
event.stopPropagation();
if (!!openElement) {
closeMenu();
}
if (!elementWasOpen && !element.hasClass('disabled') && !element.prop('disabled')) {
element.parent().addClass('open');
openElement = element;
closeMenu = function (event) {
if (event) {
event.preventDefault();
event.stopPropagation();
}
$document.unbind('click', closeMenu);
element.parent().removeClass('open');
closeMenu = angular.noop;
openElement = null;
};
$document.bind('click', closeMenu); /* <--- CAUSE OF ALL PROBLEMS ----- */
}
});
}
};
}]);
/**
* This is were we decorate the dropdownToggle directive
* in order to change the way the document click handler works
*/
myApp.config(function($provide){
'use strict';
$provide.decorator('dropdownToggleDirective', [
'$delegate',
'$document',
function ($delegate, $document) {
var directive = $delegate[0];
var openElement = null;
var closeMenu = angular.noop;
function handler(e){
var elm = angular.element(e.target);
if(!elm.parents('.dropdown-menu').length){
e.stopPropagation();
e.preventDefault();
}
closeMenu();
// After closing the menu, we remove the all-seeing handler
// to allow the application click events to work nnormally
$document[0].removeEventListener('click', handler, true);
}
directive.compile = function(){
return function(scope, element) {
scope.$watch('$location.path', closeMenu);
element.parent().bind('click', closeMenu);
element.bind('click', function (event) {
var elementWasOpen = (element === openElement);
event.preventDefault();
event.stopPropagation();
if (!!openElement) {
closeMenu();
}
if (!elementWasOpen && !element.hasClass('disabled') && !element.prop('disabled')) {
element.parent().addClass('open');
openElement = element;
closeMenu = function (event) {
if (event) {
event.preventDefault();
event.stopPropagation();
}
$document.unbind('click', closeMenu);
element.parent().removeClass('open');
closeMenu = angular.noop;
openElement = null;
};
// We attach the click handler by specifying the third "useCapture" parameter as true
$document[0].addEventListener('click', handler, true);
}
});
};
};
return $delegate;
}
]);
});
更新:
请注意,除非目标元素是实际的下拉选项,否则更新的自定义处理程序将防止冒泡。这将解决即使单击下拉选项也阻止单击事件的问题。
这仍然不会阻止事件冒泡到行(从下拉选项),但这与下拉指令没有任何关系。无论如何,为了防止这种冒泡,您可以将$event
对象传递给ng-click
表达式函数并使用该对象来阻止偶数冒泡到表格行:
<div ng-controller="DropdownCtrl">
<table>
<tr ng-click="clicked('row')">
<td>
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle">
Action <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li ng-repeat="choice in items">
<a ng-click="clicked('link element', $event)">{{choice}}</a>
</li>
</ul>
</div>
</td>
</tr>
</table>
</div>
function DropdownCtrl($scope) {
$scope.items = [
"Action",
"Another action",
"Something else here"
];
$scope.clicked = function(what, event) {
alert(what + ' clicked');
if(event){
event.stopPropagation();
event.preventDefault();
}
}
}