Angular.js：当输入处于焦点时设置CSS

Question

有人知道如何进行以下工作：

如果用户在“名称”中单击-在DIV上将CSS类设置为XYZ？

<div ng-class="???">Enter your Name here</div>

<input type="text" ng-model="user.name" required id="name"/>

版本：AngularJS v1.0.8

Answer 1

如果您使用的是Angular 1.2.x，请参阅ng- focus和ng- blur：

<div ng-class="{xyz: focused}">Enter your name here</div>
<input type="text" ng-model="user.name" ng-init="focused = false" ng-focus="focused = true" ng-blur="focused = false" id="name" required>

如果您使用的是1.0.x版本，则不会阻止您基于Angular
1.2.x
定义自己的指令focus和blur指令：

/*
 * A directive that allows creation of custom onclick handlers that are defined as angular
 * expressions and are compiled and executed within the current scope.
 *
 * Events that are handled via these handler are always configured not to propagate further.
 */
var ngEventDirectives = {};
forEach(
  'click dblclick mousedown mouseup mouseover mouseout mousemove mouseenter mouseleave keydown keyup keypress submit focus blur copy cut paste'.split(' '),
  function(name) {
    var directiveName = directiveNormalize('ng-' + name);
    ngEventDirectives[directiveName] = ['$parse', function($parse) {
      return function(scope, element, attr) {
        var fn = $parse(attr[directiveName]);
        element.on(lowercase(name), function(event) {
          scope.$apply(function() {
            fn(scope, {$event:event});
          });
        });
      };
    }];
  }
);