Atlas学习手记(26):使用Validators验证用户输入
Validator是Atlas提供的一组验证用户输入的客户端组件,用来检查InputControl类型的Atlas控件,例如Web.UI.TextBox的输入数据。在ASP.NET中提供了一组服务器端的验证控件,Atlas中的Validator在客户端也提供了同样的功能。
主要内容
1.Validators概述
2.完整示例
一.Validators概述
Validator是Atlas提供的一组验证用户输入的客户端组件,用来检查InputControl类型的Atlas控件,例如Web.UI.TextBox的输入数据。在ASP.NET中提供了一组服务器端的验证控件,Atlas中的Validator在客户端也提供了同样的功能。Atlas提供的Validator如下所示:
1.requiredFieldValidator:检查是否有数据输入。
2.typeValidator:检查输入的数据是否为特定的类型。
3.rangeValidator:检查输入的值是否在一个范围之内。
4.customValidator:用自定义的验证函数验证输入。
5.regexValidator:用指定的正则表达式验证输入。
某个Atlas客户端控件的Validator可被定义成一个集合,当控件的propertyChanged事件被引发时,Atlas将调用Validator集合中的所有Validator去验证输入的数据。在验证的过程中一旦失败,这个Validator的validationMessage将被设置。Validator可以以组的形式验证一组控件的输入,并统一显示错误信息。您还可以指定一个validationErrorLabel控件关联于某个将被验证的输入控件,它可以显示验证过程中的错误并可以自定义错误提示。[来自于Dflying的介绍]
二.完整示例
下面针对这几种Validator做几个简单的小例子。
1.requiredFieldValidator
检测是否有有数据输入,用一个textbox接收用户输入,用一个label来显示错误信息:
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编写Atlas脚本,分别用一个requiredFieldValidator和validtionErrorLabel,并且把用户输入的数据显示在一个label上,在validationErrorLabel中用associatedControl来关联要验证的控件:
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运行后界面如下:
输入数据,验证通过,没有提示错误信息:
输入为空,提示错误信息“You must enter some text”:
2.typeValidator
检测用户输入的数据类型,在这个例子中我们验证用户输入的是否为数据:
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编写Atlas脚本,设置非常简单,指定type为Number:
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编译运行,输入数字100,验证通过没有报错误信息:
输入TerryLee,提示“You must enter a valid number”错误信息:
3.regexValidator
用正则表达式来验证用户输入的数据,这里我们以验证用户录入的电话号码格式是否正确为例,添加相关的HTML元素:
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编写Atlas脚本,加入regexValidator,注意这儿在正则表达式的前后必须加入“/”?否则会报脚本错误:
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编译运行,录入正确的电话号码:
输入错误格式的电话号码,会报“You must a valid phone number”错误:
本文就简单的介绍到这儿,其他的示例大家可以参考Atlas官方网站。