主干验证不起作用 [英] Backbone Validate does not work

问题描述

我使用 Backbone 的 validate 函数来保证 Man 的 age 属性大于 18.这是我的代码:

I am using Backbone's validate function to guarantee Man to have an age property more than 18. Here is my code:

var Man = Backbone.Model.extend({
    initialize : function(){
        this.on("error",function(model,error){
            alert(error);
        });
    },
    validate : function(attrs,options){
        if (attrs.age < 18){
            return 'below 18';
        } 
    }
})

var man = new Man({name : 'qian', age : 12});

但从结果来看，validate 似乎不起作用.

But looking at the result it seems that validate doesn't work.

推荐答案

在 Backbone.js(0.9.10 之前的版本)中，validate 在 之前被调用>save 和 set 之前一样.

In Backbone.js (prior to version 0.9.10), validate is called before save as well as before set.

当您设置 invalid 值时，您将收到 alert 错误.

You will get an alert error when you set invalid value.

示例 - age 值低于 18 :

Example - age value is below 18 :

var man = new Man ({name : 'qian', age : 12});
man.set({ age: 12 }); // that will trigger alert

编辑

对于 Backbone.js 版本 0.9.10+ 报告了一个问题:验证失败不触发错误回调.问题解释说

For Backbone.js version 0.9.10+ there is an issue reported: Failed validation does not trigger error callback. Issue explanation says that

invalid 事件代替 error

因此将您的代码更改为:

So changing your code to:

var Man = Backbone.Model.extend({
    initialize : function(){
        this.on("invalid",function(model,error){
            alert(error);
        });
    },
    ...

并且将 validate 选项设置为 true 的变量设置将触发 alert.

And setting variable with validate option set to true will trigger an alert.

man.set({age: 12}, {validate : true});

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