从Ember.View更新子视图

时间:2012-04-08 23:06:41

标签: javascript ember.js

我正在使用服务器API调用执行ajax表单。 服务器可以返回特定字段的错误消息(例如:url =>'此网址不正确')。

所以我为我的表单Textfield创建了一个特定的视图:

(textfield.handlebars)
{{view Ember.TextField valueBinding="value"}}
{{#if hasError}}
    <div class="error">{{errorMessage}}</div>
{{/if}}

(textfield.js)
App.TextField = Ember.View.extend({
    hasError: false,
    errorMessage: "",
    templateName:     "textfield",
});

在我的表单视图模板中,我有:

(form.handlebars)
<div class="form-row">
    <div class="form-element"><div class="input-wrapper">{{view App.TextField valueBinding="skill.job"}}</div></div>
</div>

(new.js)
submit: function() {
    var skill = this.get("skill");

    skill.saveResource()
    .fail( function(e) {
        //how could I set the errorMessage in my App.TextField
    });
}

当用户点击提交按钮时,我将所有表单数据发送到服务器并检索错误消息。

我的问题是如何更新“子视图”App.TextField来设置错误消息?

2 个答案:

答案 0 :(得分:4)

您可以使用保存错误消息的自定义App.Error对象。此外,如果您计划使用ember-data,则会讨论验证https://github.com/emberjs/data/pull/130。在优秀的Ember.js插件中有一个验证扩展:https://github.com/capitainetrain/ember-addons/tree/master/packages/ember-validators/lib

以下是我的想法,请参阅http://jsfiddle.net/pangratz666/kQJ2t/

<强>车把

<script type="text/x-handlebars" data-template-name="edit" >
    name: {{view App.TextField valueBinding="content.name" propertyName="name" }}</br>
    age: {{view App.TextField valueBinding="content.age" propertyName="age" }}</br>
    <button {{action "save"}}>save</button>
</script>​

<强>的JavaScript

App.Error = Ember.Object.extend({
    isError: function(propertyName) {
        return !Ember.empty(this.getErrorMessage(propertyName));
    },
    getErrorMessage: function(propertyName) {
        return this.get(propertyName);
    }
});

App.ErrorMixin = Ember.Mixin.create({
    classNameBindings: ['isError:error'],
    errorBinding: 'parentView.error',

    template: Ember.Handlebars.compile('{{#if isError}}{{errorMessage}}{{/if}}'),

    isError: function() {
        var error = this.get('error');
        return error && error.isError(this.get('propertyName'));
    }.property('error', 'propertyName'),

    errorMessage: function() {
        var error = this.get('error');
        if (error) {
            var propertyName = this.get('propertyName');
            return error.getErrorMessage(propertyName);
        }
    }.property('error', 'propertyName')
});

App.TextField = Ember.TextField.extend(App.ErrorMixin);

然后构造错误对象:

Ember.View.create({
    templateName: 'edit',
    contentBinding: 'App.obj',
    save: function() {
        var content = this.get('content');
        var error = this.get('error');
        if (error) {
            error.destroy();
        }

        error = App.Error.create();

        if (content.get('age') <= 100) {
            error.set('age', 'sorry, you are not wise enough');
        }

        if ('Chuck Norris' === content.get('name')) {
            error.set('name', 'yeah, and i am the queen of england');
        }

        this.set('error', error);
    }
}).append();​

答案 1 :(得分:1)

在form.handlebars上手动为它设置一个id(因此它将覆盖ember自动生成的id):

<div class="form-row">
  <div class="form-element"><div class="input-wrapper">{{view App.TextField id="skill_job" valueBinding="skill.job"}}</div></div>
</div>

然后:

submit: function() {
    var skill = this.get("skill");

    skill.saveResource()
    .fail( function(e) {
        Ember.View.views["skill_job"].set('errorMessage', 'blah');
        Ember.View.views["skill_job"].set('hasError', true);
        // of course you will probably want to handle this message from the request or whatever, hope you get the idea
    });
}