改变焦点输入在AngularJS的关键事件 [英] Change focus to input on a key event in AngularJS
问题描述
测试案例： http://jsbin.com/ahugeg/4/edit （略长）
在上面的测试情况下，我有三个输入元素，由生成的NG-重复指令。我在这个测试用例意图是，击中的这些输入中的一个的向上/向下箭头应在相应的方向上移动焦点到输入，如果有在该方向提供一个输入
In the above test case, I have three input elements, generated by ng-repeat directive. My intention in this test case, is that hitting the up/down arrows in one of these inputs should move focus to the input in the corresponding direction, if there is an input available in that direction.
我是新来AngularJS，所以我可能会丢失一些简单的方法来做到这一点。无论如何，我定义了两个新指令（上了和上向下），来处理上下活动和我调用 $ scope.focusNext 和 $ scope.focus $ p $光伏方法，传递正确的条目，相对于后者的焦点应该移动。这是我在哪里卡住了。
I am new to AngularJS, so I might be missing on some straightforward way to do this. Anyway, I defined two new directives (on-up and on-down), to handle the up and down events and am calling the $scope.focusNext and $scope.focusPrev methods, passing the correct entry, relative to which the focus should move. This is where I am stuck.
我知道这是不是的角路的处理在控制器DOM元素，但我不能怎么看的焦点的可以被看作是一个属性/模型的属性。我甚至想到有一个单独的 $ scope.focusedEntry ，但我应该看的关于该属性的变化？即使我做，我发现变化，我怎么能访问与我想集中条目的输入元素？
I know it is not the angular-way to deal with DOM elements in controllers, but I can't see how the focus can be seen as an attribute/property of a model. I even thought of having a separate $scope.focusedEntry, but then should I watch for changes on that property? Even if I do and I detect changes, how can I access the input element corresponding to the entry I want focused?
在这个应该怎么做都非常AP preciated任何帮助。
Any help on how this should be done are very much appreciated.
推荐答案
我刚写了这件事，并测试它简单 - 它你想要做什么，而无需在控制器中的所有额外的杂波和在HTML中。看到它的工作这里。
I just wrote this up and tested it briefly - it does what you want without all the extra clutter in your controller and in the HTML. See it working here.
HTML
<body ng-controller="Ctrl">
<input ng-repeat="entry in entries" value="{{entry}}" key-focus />
</body>
控制器：
function Ctrl($scope) {
$scope.entries = [ 'apple', 'ball', 'cow' ];
}
指令：
app.directive('keyFocus', function() {
return {
restrict: 'A',
link: function(scope, elem, attrs) {
elem.bind('keyup', function (e) {
// up arrow
if (e.keyCode == 38) {
if(!scope.$first) {
elem[0].previousElementSibling.focus();
}
}
// down arrow
else if (e.keyCode == 40) {
if(!scope.$last) {
elem[0].nextElementSibling.focus();
}
}
});
}
};
});
这篇关于改变焦点输入在AngularJS的关键事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
