java - Play Framework 中的发布请求中的表单值为null

Question

我有html回发表格，像这样:

@(message: String)

@main("Contact") {
<link rel="stylesheet" media="screen" href="@routes.Assets.at("stylesheets/contact.css")">
<div id="pageContainer">
    <div id="form">
        <div id="topText">
            <p>Have a question or need some assistance? Let us know and we'll get back to you ASAP.</p>
        </div>
        <br/>
        <form method="POST" action="@routes.Home.contact()">

            <div id="contactInfo">
                <label class="contactLabel">First Name:</label><input type="text" name="firstName" id="firstName" class="contactInput" /> <br />
                <label class="contactLabel">Last Name:</label><input type="text" name="lastName" id="lastName" class="contactInput" /> <br />
                <label class="contactLabel">Email:</label><input type="text" name="email" id="email" firstName" class="contactInput" /> <br />
                <label class="contactLabel">Company:</label><input type="text" id="company" name="company" class="contactInput" /> <br />
                <input type="hidden" id="hidden" name = "hidden"></input>
                <p id="crap">@message</p>
            </div>
            <br/>
            <div id="message">
                <label class="contactLabel">Message:</label><textarea cols="50" rows="10"></textarea>
            </div>
            <input type="submit" name="submit" id="submit" value="Submit"></input>
            </form>
    </div>

</div>

}

回到 Controller 中，它看起来像这样:

public static Result contact()
{

    //Map<String,String[]> values = request().body();
    DynamicForm form = form().bindFromRequest();
    String first = "";
    if(form.data().get("firstName") != null)
    first = form.data().get("firstName").toString();

    return ok(views.html.contact.render(first));
}

但是，当我查看 form().bindFromRequest()的结果时，它始终为空。我想念什么吗？

Answer 1

这是我的处理方式:

模板

@(message: String, contactForm: Form[Contact])

@import helper._

@main("Contact") {
<link rel="stylesheet" media="screen" href="@routes.Assets.at("stylesheets/contact.css")">
<div id="pageContainer">
    <div id="form">
        <div id="topText">
            <p>Have a question or need some assistance? Let us know and we'll get back to you ASAP.</p>
        </div>
        <br/>
        @form(routes.Home.contact()) {
            <div id="contactInfo">
                <label class="contactLabel">First Name:</label> @inputText(contactForm("firstName"), 'class -> "contactInput"') <br />
                <label class="contactLabel">Last Name:</label> @inputText(contactForm("lastName"), 'class -> "contactInput"') <br />
                <label class="contactLabel">Email:</label> @inputText(contactForm("email"), 'class -> "contactInput"') <br />
                <label class="contactLabel">Company:</label> @inputText(contactForm("company"), 'class -> "contactInput"') <br />
                <input type="hidden" id="hidden" name="hidden"></input>
                <p id="crap">@message</p>
            </div>
            <br/>
            <div id="message">
                <label class="contactLabel">Message:</label><textarea cols="50" rows="10"></textarea>
            </div>
            <input type="submit" value="Submit" />
        }
    </div>
</div>
}

class 联系

public class Contact {
    public String firstName;
    public String lastName;
    public String email;
    public String company;
    // other stuff
}

Controller

public static Result contact() {
    Form<Contact> contactForm = form(Contact.class).bindFromRequest();
    if (contactForm.hasErrors()) {
        // process
    } else {
        // contactForm.get().firstName should be filled with the correct data
        return ok(views.html.contact.render("message", contactForm)); 
    }
}

对你起作用吗 ？
您应该查看有关这些主题的Play2文档:

JavaForms

JavaForm Helpers

编辑

if you can explain why the way I was doing it previously didn't work

我不确定，但是我可以在您的代码中看到一个问题，您不必在动态表单上调用 data()，直接使用 DynamicForm.get()就足够了，因此 first = form.get("firstName")就足够了。

此外，您可以从 DynamicForm Javadoc中看到

get(java.lang.String key)

Gets the concrete value if the submission was a success.

如果没有错误，则 DynamicForm后面的内部映射将具有值，因此您可以在实际从字段中获取具体值之前使用 hasErrors进行检查。

从我的角度来看，使用 form(Contact.class).bindFromRequest()样式填充类 Contact的实例会更好，更轻松，而不必说可以使用Java批注来验证字段。