Thymeleaf 构造对象 [英] Thymeleaf construct object

问题描述

我将模型属性从控制器传递到百里香叶表单，以便我可以像这样绑定对象:

<form name="f" th:action="@{/signup}" th:object="${userCredentials}" method="post" class="form-horizo​​ntal"><input th:placeholder="#{messages.form.email}" type="text" th:field="*{email}"name="email" id="email" class="form-control"/><input th:placeholder="#{messages.form.name}" type="text" th:field="*{name}"name="name" id="name" class="form-control"/><input type="password" th:placeholder="#{messages.form.password}" th:field="*{password}"名称="密码" id="密码"/><button type="submit" th:text="#{messages.form.signup}"></button></表单>

但是我想将此表单作为来自其他视图的片段重用，但我不能这样做，因为 ${userCredentials} 表单对象未初始化.我可以像这样在我的视图中以某种方式构造这个对象吗?

<div th:if="${userCredentials == null}" th:with="userCredentials=new UserCredentials()"></div>

解决方案

我认为使用 new 创建对象是不可能的，但是您可以在 UserCredentials 上创建一个返回一个静态方法的静态方法新对象并使用它.像这样:

public class UserCredentials {公共静态 UserCredentials create() {返回新的 UserCredentials();}}

在百里香叶中

<div th:if="${userCredentials == null}" th:with="userCredentials=${T(your.package.here.UserCredentials).create()}"><;/div>

Im passing a model attribute from controller to thymeleaf form so I could bind object like this:

<div class="container" style="max-width: 600px" th:fragment="signupForm">
    <form name="f" th:action="@{/signup}" th:object="${userCredentials}" method="post" class="form-horizontal">
        <input th:placeholder="#{messages.form.email}" type="text" th:field="*{email}"
               name="email" id="email" class="form-control"/>
        <input th:placeholder="#{messages.form.name}" type="text" th:field="*{name}"
               name="name" id="name" class="form-control"/>
        <input type="password" th:placeholder="#{messages.form.password}" th:field="*{password}"
               name="password" id="password"/>
        <button type="submit" th:text="#{messages.form.signup}"></button>
    </form>
</div>

However I'd like to reuse this form as fragment from other views, but I can't do that because the ${userCredentials} form object is not initialized. Can I somehow construct this object inside of my view like this?

<div th:if="${userCredentials == null}" th:with="userCredentials=new UserCredentials()"></div>

解决方案

I don't think it's possible to create an object using new, you can however create a static method on UserCredentials that returns a new object and use that. Something like this:

public class UserCredentials {
  public static UserCredentials create() {
    return new UserCredentials();
  }
}

and in the thymeleaf

<div th:if="${userCredentials == null}" th:with="userCredentials=${T(your.package.here.UserCredentials).create()}"></div>

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