从Knockout组件

时间:2016-06-15 12:14:03

标签: javascript jquery knockout.js reference custom-component

我正在编写一个淘汰组件,我需要通过jquery对组件中的DOM对象进行一些操作。

如何获取元素的引用?我无法在其上添加id属性,因为它将针对页面上每个组件实例重复。

考虑这个例子:

<!-- component template -->
<div>
    <p data-bind="text: name">
    <audio></audio>
</div>


// View model
define(["jquery", "knockout"], function ($, ko) {

    var audioElement = $("????");

    function vm(params) {        
        var self = this;
        self.name = params.name;    
    };

    return vm;
});

如果页面上有多个组件实例,我如何获取对音频标签的jquery引用?

1 个答案:

答案 0 :(得分:3)

如果使用createViewModel工厂函数注册组件,则可以在实例化组件时访问相关的DOM部件。

the docs开始,查看有关componentInfo的评论:

ko.components.register('my-component', {
  viewModel: {
    createViewModel: function(params, componentInfo) {
      // - 'params' is an object whose key/value pairs are the parameters
      //   passed from the component binding or custom element
      // - 'componentInfo.element' is the element the component is being
      //   injected into. When createViewModel is called, the template has
      //   already been injected into this element, but isn't yet bound.
      // - 'componentInfo.templateNodes' is an array containing any DOM
      //   nodes that have been supplied to the component. See below.

      // Return the desired view model instance, e.g.:
      return new MyViewModel(params);
    }
  },
  template: ...
});

我强烈建议通过敲除和它的数据绑定来进行DOM操作。