Java 隐藏字段值空白 Thymeleaf
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/25808433/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Hidden Field Value Blank Thymeleaf
提问by Kaushik Balasubramanain
I have a thymeleaf form which has 2 hidden fields. I specify the value of the hidden fields using th:value, and I bind these fields to an object.
我有一个百里香叶形式，它有 2 个隐藏字段。我使用 th:value 指定隐藏字段的值，并将这些字段绑定到一个对象。
<div class="w-row">
<div class="w-col w-col-6">
<div class="question_text_sc">
<p th:text="${questionVO.questionText}" />
<p th:text="${questionVO.questionStem}" />
<p th:text="${sequenceNo}" />
<p th:text="${quizID}" />
</div>
</div>
<div class="question_stem_sc"></div>
<div class="w-col w-col-6">
<div>
<div class="w-form">
<form class="w-clearfix" id="email-form" name="email-form" data-name="Email Form" action="#" th:action="@{/quiz/question}" th:object="${userResponseVO}" method="post">
<div th:each="option: ${questionVO.answerOptions}" class="w-radio radio_select" th:id="${'radio_1'}">
<input class="w-radio-input" id="radio" type="radio" name="answer_sc" th:field="*{answerID}" th:value="${option}"/>
<label class="w-form-label" id="answer_1" for="radio"><p th:text="${option}" /></label>
</div>
<input type="hidden" name="sequenceNo" th:field="*{sequenceNo}" th:value="${sequenceNo}" ></input>
<input type="hidden" name="quizID" th:field="*{quizID}" th:value="${quizID}"></input>
<button class="button submit_answr" type="submit">Next Question</button>
</form>
I want to bind the quizID and sequenceNo fields with the respective fields in the object. Line 6 and 7 correctly resolve the value of sequence number/quiz id and display it. However, the same value is not resolved in the th:value tag inside the form. The value is empty and nothing gets bound to the object fields.
我想将 quizID 和 sequenceNo 字段与对象中的相应字段绑定。第 6 行和第 7 行正确解析序列号/测验 id 的值并显示它。但是，在表单内的 th:value 标记中没有解析相同的值。该值为空，并且没有任何内容绑定到对象字段。
Request your help here.
在此处请求您的帮助。
EDIT:
编辑：
The code works when I remove the th:field attribute from the hidden element. But I want to bind it to an object variable, so that the server can process it. `
当我从隐藏元素中删除 th:field 属性时，该代码有效。但是我想将它绑定到一个对象变量，以便服务器可以处理它。`
采纳答案by ziuu
For me helped setting th:field(or actually name) using th:attr
对我来说帮助设置th:field（或实际上name）使用th:attr
th:value="${question.id}"
th:attr="name='questionIds[' + ${iter.index} + ']'"
In my example I wanted to have value from ${question}but the target in input is questionIDs[i]
在我的例子中，我想从中获得价值，${question}但输入中的目标是questionIDs[i]
In simple problem like your name=answerIdshould be enough.
在像你这样的简单问题中name=answerId就足够了。
回答by Govardhana Rao Ganji
We can resolve your scenario in 2 ways
我们可以通过两种方式解决您的情况
1st way:
第一种方式：
<input type="hidden" th:value="${question.id}" th:attr="name='quizID'" />
2nd way:
方式二：
<input type="hidden" th:value="${question.id}" name="quizID" />
If you used thymeleaf th:field="*{sequenceNo}", internal code of thymeleaf works like,
如果你使用 thymeleaf th:field="*{sequenceNo}"，thymeleaf 的内部代码就像这样，
It will check is there any nameattribute to particular element, if it is available th:field value overrides on name attribute.
name="sequenceNo"
It will check is there any idattribute to particular element, if it is not available with the name of th:field value new attribute added on i.e)id.
id="sequenceNo"
它将检查特定元素是否有任何name属性，如果它可用th:field 值覆盖 name 属性。
名称=“序列号”
它将检查特定元素是否有任何id属性，如果它不可用th:field value 新属性的名称添加到 ie)id。
id="序列号"
回答by Victor MySon
it seems Thymeleaf does not recognize the hiddenfields. in order to fix it, try this:
似乎 Thymeleaf 无法识别这些hidden字段。为了修复它，试试这个：
- define the input as text (not as hidden).
- define an the style tag like
"display:none"in order to hide the elements from the screen.
- 将输入定义为文本（而不是隐藏）。
- 定义一个样式标签
"display:none"，以便从屏幕上隐藏元素。
The result should be something like this:
结果应该是这样的：
<input type="text" th:field="*{parameters[${stat.index}].field}" style="display:none;">
Hope it helps.
希望能帮助到你。
