[英]Play Framework 2.0 form helper: from checkbox to List<String>
I have a model that contains a String and a list: 我有一个包含String和列表的模型:
public String title;
public List<String> topics;
In index.scala.html I use a form to add new items: 在index.scala.html中,我使用表单添加新项:
@form(routes.Application.newPaper()) {
@inputText(paperForm("title"))
<input type="submit" value="Create">
}
with a simple String, this works nicely. 使用简单的String,这很好用。 But I would like to show checkboxes 但我想显示复选框
@for(t <- topics) {
<input type='checkbox' name='topic' value=@t>@t <br>
}
and subsequently add all checked 'topics' to the List<String> topics;
然后将所有选中的'主题'添加到List<String> topics;
of my new item. 我的新项目。 How can I process the checkboxes within @form{ ... }? 如何处理@form {...}中的复选框?
I am using Play!Framework 2.1.0 , below is the solution : 我正在使用Play!Framework 2.1.0 ,下面是解决方案:
1. In the scala template, you must give all checkbox name like this: 1.在scala模板中,您必须提供所有复选框名称,如下所示:
@form(action = routes.Application.newPaper()) {
@inputText(paperForm("title"))
@******* Indexed chekbox name *********@
@for((t, index) <- topics.zipWithIndex) {
<input type="checkbox" name="topics[@index]" value="@t">@t <br>
}
<input type="submit" value="Create">
}
2. Then in your controller, as an action to handle form submit, you should doing something like this : 2.然后在您的控制器中,作为处理表单提交的操作,您应该执行以下操作 :
public static Result newPaper() {
// Bind submitted form value to your model, ex. Paper.java
Form<Paper> paperForm = Form.form(Paper.class).bindFromRequest();
Paper paper = paperForm.get();
Logger.info("Title entered = " + paper.title);
// Because in template we use indexed name, unchecked item are binded with null value
paper.topics.removeAll(Collections.singleton(null)); // remove value for unchecked topic
for (String t : paper.topics) {
Logger.info("The topic is " + t);
}
Logger.info("Total topic selected = " + paper.topics.size());
return redirect(routes.Application.index()); // redirect page
}
This is another idea to the solution. 这是该解决方案的另一个想法 。 Your checkbox code on scala template is not modified . 您的scala模板上的复选框代码未被修改 。
@for(t <- topics) {
<input type='checkbox' name='topic' value=@t>@t <br>
}
So the controller should be like this : 所以控制器应该是这样的:
public static Result newPaper() {
// Bind submitted form value to your model, ex. Paper.java
Form<Paper> paperForm = Form.form(Paper.class).bindFromRequest();
Paper paper = paperForm.get();
// get request value from submitted form
Map<String, String[]> map = request().body().asFormUrlEncoded();
String[] checkedVal = map.get("topic"); // get selected topics
// assign checked value to model
paper.topics = Arrays.asList(checkedVal);
// for debugging purpose
for (String t : paper.topics) {
Logger.info("The topic is " + t);
}
Logger.info("Total topic selected = " + paper.topics.size());
return redirect(routes.Application.index()); // redirect page
}
Hope this idea is more elegant.. :) 希望这个想法更优雅.. :)
Note: I have tested on Play!Framework 2.1.1 too, and that is work for me. 注意:我也在Play!Framework 2.1.1上测试过,这对我有用。
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