播放框架选择输入验证 [英] Play framework select input validation

问题描述

我正在使用Play 2.1 我使用助手字段构造函数创建了一个选择下拉框. 下拉框有3个字段，默认为:选择性别"，男性"和女性". 如何确保用户选择男性或女性之一，而不选择默认值? (必填的下拉字段)

I am using Play 2.1 I made a select drop down box using the helper field constructor. The drop down box have 3 fields, default:"choose a gender", Male, and Female. How do I ensure that the user choose one of male or female, and not the default value? (A required drop down field)

推荐答案

我正在使用 Play！Framework 2.1.0 ，以下是您遇到的问题的简单解决方案:

I am using Play!Framework 2.1.0, below is a simple solution for your problem:

模型应如下所示:(下面是您遇到的问题的简单模型)

The model should be like this: (Below is simple model for your problem)

package models;

import play.data.validation.Constraints;

public class Gender {
   // This field must have a value (not null or not an empty string)
   @Constraints.Required
   public String gender;
}

控制器应如下所示:

/** Render form with select input **/
public static Result selectInput() {
   Form<Gender> genderForm = Form.form(Gender.class);

   return ok(views.html.validselect.render(genderForm));
}

/** Handle form submit **/
public static Result validateSelectInput() {
   Form<Gender> genderForm = Form.form(Gender.class).bindFromRequest();

   if (genderForm.hasErrors()) { // check validity
      return ok("Gender must be filled!"); // can be bad request or error, etc.
   } else {
      return ok("Input is valid"); // success validating input
   }
}

模板/视图应如下所示:

@(genderForm: Form[models.Gender])
@import views.html.helper._

@main(title = "Validate Select") {
   @form(action = routes.Application.validateSelectInput()) {
      @********** The default value for select input should be "" as a value *********@
      @select(
         field = genderForm("gender"),
         options = options("" -> "Select Gender", "M" -> "Male", "F" -> "Female")
      )

      <input type="submit" value="Post">
   }
}

另请参阅此帖子作为参考:使用Play Framework 2.0模板中的选项帮助程序

See also this post as reference : Use of option helper in Play Framework 2.0 templates

这篇关于播放框架选择输入验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！