Ember.js:上传文件组件

Question

我需要创建一个Ember组件来选择一个文件.我的页面将包含多个"上传组件"

我已经阅读了一篇试图实现的帖子:(/sf/ask/644000031/)但是UploadFileView直接链接到控制器.我想要更通用的东西......

我想从视图中删除App.StoreCardController.set('logoFile'..)依赖项或从模板中传递字段(logoFile)...

有没有想过改进这段代码？

   App.UploadFileView = Ember.TextField.extend({
    type: 'file',
    attributeBindings: ['name'],
    change: function(evt) {
      var self = this;
      var input = evt.target;
      if (input.files && input.files[0]) {
        App.StoreCardController.set('logoFile', input.files[0]);
      }
    }
});

和模板:

{{view App.UploadFileView name="icon_image"}}
{{view App.UploadFileView name="logo_image"}}

Answer 1

我完成了一个完整的例子来展示这一点

https://github.com/toranb/ember-file-upload

这是基本的车把模板

<script type="text/x-handlebars" data-template-name="person">
{{view PersonApp.UploadFileView name="logo" contentBinding="content"}}
{{view PersonApp.UploadFileView name="other" contentBinding="content"}}
<a {{action submitFileUpload content target="parentView"}}>Save</a>
</script>

这是自定义文件视图对象

PersonApp.UploadFileView = Ember.TextField.extend({
    type: 'file',
    attributeBindings: ['name'],
    change: function(evt) {
      var self = this;
      var input = evt.target;
      if (input.files && input.files[0]) {
        var reader = new FileReader();
        var that = this;
        reader.onload = function(e) {
          var fileToUpload = reader.result;
          self.get('controller').set(self.get('name'), fileToUpload);
        }
        reader.readAsDataURL(input.files[0]);
      }
    }
});

这是控制器

PersonApp.PersonController = Ember.ObjectController.extend({
  content: null,
  logo: null,
  other: null
});

最后这里是视图w/submit事件

PersonApp.PersonView = Ember.View.extend({
  templateName: 'person',
  submitFileUpload: function(event) {
    event.preventDefault();
    var person = PersonApp.Person.createRecord({ username: 'heyo', attachment: this.get('controller').get('logo'), other: this.get('controller').get('other') });
    this.get('controller.target').get('store').commit();
  }
});

如果您启动django应用程序,这将在文件系统上删除2个文件

Answer 2

编辑(2015.06):刚刚创建了一个基于组件的新解决方案.此解决方案提供带有预览和删除图标的上传按钮.PS这些fa类是Font Awesome

组件车把

<script type="text/x-handlebars" data-template-name='components/avatar-picker'>
        {{#if content}}
            <img src={{content}}/> <a {{action 'remove'}}><i class="fa fa-close"></i></a>
        {{else}}
            <i class="fa fa-picture-o"></i>
        {{/if}}

        {{input-image fdata=content}}
</script>

组件JavaScript

App.AvatarPickerComponent = Ember.Component.extend({
    actions: {
        remove: function() {
            this.set("content", null);
        }
    }
});

App.InputImageComponent = Ember.TextField.extend({
    type: 'file',

    change: function (evt) {
        var input = evt.target;
        if (input.files && input.files[0]) {
            var that = this;

            var reader = new FileReader();
            reader.onload = function (e) {
                var data = e.target.result;
                that.set('fdata', data);
            };
            reader.readAsDataURL(input.files[0]);
        }
    }
});

用法示例

{{avatar-picker content=model.avatar}}

老答案

我拿了Chris Meyers的例子,我把它缩小了.

模板

{{#view Ember.View contentBinding="foto"}}
    {{view App.FotoUp}}
    {{view App.FotoPreview width="200" srcBinding="foto"}}
{{/view}}

JavaScript的

App.FotoPreview= Ember.View.extend({
    attributeBindings: ['src'],
    tagName: 'img',
});


App.FotoUp= Ember.TextField.extend({
    type: 'file',

    change: function(evt) {
        var input = evt.target;
        if (input.files && input.files[0]) {
            var that = this;

            var reader = new FileReader();
            reader.onload = function(e) {
                var data = e.target.result;
                that.set('parentView.content', data);
            }
            reader.readAsDataURL(input.files[0]);
        }
    },
});