选项1 - 更好

Question

在下面的代码中，我正在尝试使用模板（使用{{value}}替换）但我已经尝试了两天来找到一种获取渲染代码的方法来设置一些属性。< / p>

我不能使用样式选择器（工作正常），我需要使用div的id。在我的实际代码中，我使用templateUrl：不是内联代码，但它具有相同的结果。

我应该听哪个事件？选择者在什么时候工作？我读过有关编译和链接的内容，并认为答案在某处？

提前致谢...

<!doctype html>
<html lang="en" ng-app="myApp">
<head>
  <meta charset="utf-8">
  <title>My AngularJS App</title>

  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>


</head>
<body style="height:100%; width: 100%;">

    <tls-window window-id="fred" window-width="600" window-label-width="150"></tls-window>

  <script src="lib/angular/angular.js"></script>
  <script src="js/app.js"></script>
  <script src="js/core/services.js"></script>
  <script src="js/core/controllers.js"></script>
  <script src="js/core/filters.js"></script>
  <script src="js/core/directives.js"></script>

  <script src="js/core/tlscore-directives.js"></script>

<script type="text/javascript" >

var coreDirectives = angular.module('tlsCore.directives', []);

coreDirectives.directive('tlsWindow', function() {
  return {
    restrict: 'E',
    scope:  {
        windowId: '@windowId',
        windowWidth: '@windowWidth',
        labelWidth: '@windowLabelWidth'
    },
    replace: true,
    transclude: false,
    template: '  <div id="{{windowId}}" class="tls-window" ng-cloak tls-draggable >' +
        '<div id="{{windowId}}-winBackground" class="tls-window-background" style="width: 300px; height: 200px" >' +
            '<div id="{{windowId}}-winToolbarBackground" class="tls-window-toolbar-background">' +
                '<div id="{{windowId}}-winToolbarContent" class="tls-window-toolbar-content" style="width: 300px; height: 100px">' +
                '</div>' +
            '</div>' +
        '</div>',
    link: function (scope, element, attrs) {

        var ele = element.get(element.index(scope.windowId));

        // this works and sets the colour (by class)
        $('.tls-window-toolbar-content').css ("background-color",  'red');

        // this does not work as the id of the element is not yet substituted and rendered ??
        $('#fred-winBackground').css ("background-color",  'green');

    }   
  }
}); 

</script>

</body>
</html>

Answer 1

选项1 - 更好

不使用template方法，而是将HTML移到link方法中。这使我们能够在编译之前手动$interpolate括号内的术语，然后使用ID选择器。请注意，如果不使用=而不是@隔离范围绑定，则无法做到这一点，因为@绑定被推迟到以后并且在link方法中未定义（请参阅更多关于here）。

app.directive('tlsWindow', function($interpolate,$compile) {
  return {
    restrict: 'E',
    scope: {
        windowId: '=',
        windowWidth: '=',
        labelWidth: '='
    },
    link: function (scope, element, attrs) {
        var template = '<div id="{{windowId}}" class="tls-window" ng-cloak tls-draggable >' +
        '<div id="{{windowId}}-winBackground" class="tls-window-background" style="width: 300px; height: 200px" >' +
            '<div id="{{windowId}}-winToolbarBackground" class="tls-window-toolbar-background">' +
                '<div id="{{windowId}}-winToolbarContent" class="tls-window-toolbar-content" style="width: 300px; height: 100px">' +
                '</div>' +
            '</div>' +
        '</div>';

        var interpolated = $interpolate(template)(scope);
        var html = $(interpolated);
        element.replaceWith($compile(html)(scope));

        $('.tls-window-toolbar-content').css('background-color', 'red');
        $('#fred-winBackground').css('background-color', 'green');
    }   
  }
});

Here is a fiddle

选项2

不是最强大的解决方案，但这也可以。这里使用$timeout将操作推迟到渲染之后。这也会导致轻微的延迟。

$timeout(function(){
    $('#fred-winBackground').css("background-color", 'green');
},0);

这也需要将$timeout注入到指令中。

Answer 2

我看到您对为什么在链接时没有id的问题有一个答案，但是我是否可以质疑使用id选择器的原因？有了指令后，就可以通过链接函数中jqLite / jquery元素的children方法访问模板中的顶级div。参见以下示例：

angular.module('myApp', [])
.directive('tlsWindow', function() {
        return {
          restrict: 'E',
          scope: {
            windowId: '@windowId',
            windowWidth: '@windowWidth',
            labelWidth: '@windowLabelWidth'
          },
          replace: true,
          transclude: false,
          template: '<div id="{{windowId}}" class="tls-window" ng-cloak tls-draggable >' +
            '<div id="{{windowId}}-winBackground" class="tls-window-background" style="width: 300px; height: 200px" >' +
            '<div id="{{windowId}}-winToolbarBackground" class="tls-window-toolbar-background">' +
            '<div id="{{windowId}}-winToolbarContent" class="tls-window-toolbar-content" style="width: 300px; height: 100px">' +
            '</div>' +
            '</div>' +
            '</div>',
          link: function(scope, element, attrs) {
            // var ele = element.get(element.index(scope.windowId));
            // this works and sets the colour (by class)
            // $('.tls-window-toolbar-content').css("background-color", 'red');
            // this does not work as the id of the element is not yet substituted and rendered ??
            // $('#fred-winBackground').css("background-color", 'green');
            
            // Use the jqlite or jquery children method to locate the first child of your directive
            // element (from linkFn) is the element of tls-window and children() gets you access to the <div> container in your template
            element.children().css("background-color", "green");
          }
        }
      });

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<div ng-app="myApp">
  <tls-window window-id="fred" window-width="600" window-label-width="150"></tls-window>
</div>

angularjs不鼓励通过id选择器引用元素。通过传递给链接函数的元素的上下文来使用jqLite / jquery方法。

AngularJs - 指令事件和dom渲染

2 个答案:

选项1 - 更好

选项2