javascript - 以编程方式将 Angular 模板编译为 HTML 字符串

Question

在我的 Angular 1.5.11 应用程序中，我尝试以编程方式编译模板并将结果作为 HTML 字符串获取。模板内容为

<div ng-if="foo">
  <div>foo is {{foo}}, bar is {{bar}}</div>
</div> 

我尝试将其编译为 HTML 字符串:

app.controller('MainCtrl', function($scope, $rootScope, $compile) {

  function compileHtmlTemplate (templateContent, model) {
    var templateScope = $rootScope.$new(true);
    angular.extend(templateScope, model);

    return $compile(templateContent)(templateScope);
  }

  var templateContent = $('#template').html();
  var model = {foo: 'fooValue', bar: 'barValue'};
  var compiledHtml = compileHtmlTemplate(templateContent, model);
  var htmlAsString = $('<div></div>').html(compiledHtml).html();

  $scope.result = htmlAsString;
});

但是，正如您在此 Plunker example 中看到的那样, 它不起作用。我需要编译模板而不只是对其进行插值，因为它包含一个 ng-if 指令。

Answer 1

Angular 的摘要循环需要先完成，然后您才能访问该值。您可以通过使用 $timeout 来实现。

我使用 $templateCache 来检索模板，因为这是官方方式，但这只是个人喜好。

var app = angular.module('plunker', ['ngSanitize']);

app.controller('MainCtrl', function($scope, $rootScope, $compile, $timeout, $templateCache) {

  function compileHtmlTemplate (templateContent, model) {
    var templateScope = $rootScope.$new(true);
    angular.extend(templateScope, model);

    var compiled = $compile(templateContent)(templateScope);

    var parent = $("<div>").html(compiled);

    console.log("Won't work! Digest hasn't finished:", parent[0].innerHTML);

    $timeout(function(){ // must wait till Angular has finished digest
      console.log('Will work, digest has now completed:', parent[0].innerHTML);

      $scope.result = parent[0].innerHTML;
    }, 0);
  }

  // either do something with the compiled value within the $timeout, or watch for it
  $scope.$watch('result', function(newValue, oldValue) {
      if (newValue !== undefined) {
        console.log("Do something in the $timeout or here... " + newValue);
      }
  });

  // you can access the template via the template cache if you wanted
  var templateContent = $templateCache.get('template');
  var model = {foo: 'fooValue', bar: 'barValue'};
  var compiledHtml = compileHtmlTemplate(templateContent, model);
});

更新的 Plunker:https://plnkr.co/edit/ajC3Iqkxpi6O9gfieHeR?p=preview