数据绑定:模型对象的属性从整数变为字符串 [英] Data binding: property of model object changes from integer to string
问题描述
在我的应用程序中,创建了一个具有属性 foo
的模型对象 myModelObject
最初 foo
设置为一个整数。
修改 foo
在这个表单字段中,以 foo
更改为一个字符串的其他整数结果。
- 示例w / o Ember数据: http://jsbin.com/qahafapixebe/3/编辑
- 使用Ember数据的示例: http:// jsbin.com/nujesovugudo/2/edit
有没有办法确保属性在被保留后保持整数通过表单字段修改
注意: App.myModelObject.set(foo,23)
code> foo 保持整数。
我使用Ember 1.7.0。
首先,< input type =range>
control的值
属性是一个字符串。要引用 W3C wiki :
范围状态表示将元素的值设置为表示数字的字符串的控件。
$ b $我不相信你会超过浏览器的基本限制。
其次,你的问题是关于如何将该值强制为数
。你可以这样做:
App.NumericInputComponent = Ember.TextField.extend({
init:function ){
this.set('value',this.get('numericValue'));
this._super();
},
numericValue:0,
updateNumeric:function(){
this.set('numericValue',Number(this.get('value')));
} .observes('value'),
updateValue:function(){
var val = Number(this.get('numericValue'));
this.set('value',Number.isNaN(val)?null:val);
} .observes('numericValue')
});
在您的模板中,使用组件:
{{numeric-input type =rangenumericValue = myValue min =0max =100}}
请参阅以下jsbin: http://jsbin.com/vuhunesovono/1/edit?html,js,output
In my app a model object myModelObject
with a property foo
is created. Initially foo
is set to an integer. foo
can be modified in an input form field.
Modifying foo
in this form field to be some other integer results in foo
changing to be a string.
- Example w/o Ember Data: http://jsbin.com/qahafapixebe/3/edit
- Example with Ember Data: http://jsbin.com/nujesovugudo/2/edit
Is there a way to ensure that a property stays an integer after being modified via form field?
Note: App.myModelObject.set("foo", 23)
results in foo
staying an integer.
I use Ember 1.7.0.
First of all, the <input type="range">
control's value
property is a string. To quote the W3C wiki:
The range state represents a control for setting the element's value to a string representing a number.
I don't believe you will get past that fundamental constraint of the browser.
Secondly, your question is about how to enforce the value to be a Number
. You could do it this way:
App.NumericInputComponent = Ember.TextField.extend({
init: function() {
this.set('value', this.get('numericValue'));
this._super();
},
numericValue: 0,
updateNumeric: function() {
this.set('numericValue', Number(this.get('value')));
}.observes('value'),
updateValue: function() {
var val= Number(this.get('numericValue'));
this.set('value', Number.isNaN(val)?null:val);
}.observes('numericValue')
});
In your template, use the component:
{{numeric-input type="range" numericValue=myValue min="0" max="100"}}
See the following jsbin: http://jsbin.com/vuhunesovono/1/edit?html,js,output
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