Thymeleaf using path variables to th:href

Question

Here's my code, where I'm iterating through:

<tr th:each="category : ${categories}">
     <td th:text="${category.idCategory}"></td>
     <td th:text="${category.name}"></td>
     <td>
         <a th:href="@{'/category/edit/' + ${category.id}}">view</a>
     </td>
</tr>

The URL it points to is supposed to be /category/edit/<id of the category>, but it says it could not parse the expression:

Exception evaluating SpringEL expression: "category.id" (category-list:21)

Solution 1

The right way according to Thymeleaf documention for adding parameters is:

<a th:href="@{/category/edit/{id}(id=${category.idCategory})}">view</a>

Solution 2

I think your problem was a typo:

<a th:href="@{'/category/edit/' + ${category.id}}">view</a>

You are using category.id, but in your code is idCategory, as Eddie already pointed out.

This would work for you:

<a th:href="@{'/category/edit/' + ${category.idCategory}}">view</a>

Solution 3

A cleaner and easier way to do this

<a href="somepage.html" th:href="@{|/my/url/${variable}|}">A Link</a>

I found this solution in Thymeleaf Documentation on "4.8 Literal substitutions".

Solution 4

Your code looks syntactically correct, but I think your property doesn't exist to create the URL.

I just tested it, and it works fine for me.

Try using category.idCategory instead of category.id, for example…

  <tr th:each="category : ${categories}">
    <td th:text="${category.idCategory}"></td>
    <td th:text="${category.name}"></td>
    <td>
      <a th:href="@{'/category/edit/' + ${category.idCategory}}">view</a>
    </td>
  </tr>

Solution 5

I was trying to go through a list of objects, display them as rows in a table, with each row being a link. This worked for me. Hope it helps.

// CUSTOMER_LIST is a model attribute
<table>
    <th:block th:each="customer : ${CUSTOMER_LIST}">
        <tr>
            <td><a th:href="@{'/main?id=' + ${customer.id}}" th:text="${customer.fullName}" /></td>
        </tr>
    </th:block>
</table>

View more solutions

Comments

[Julian L.]

Are u sure that id is a property of a category object? Or is idCategory semantically different?

[codeaholicguy]

what different between idCategory and id?

[Andrew]

Do you have the rest of the stack trace?

[MarcDeXeT]

That's a very underappreciated answer . To my opinion that's the best one.

[Lâm Hồ]

<a th:href="${'/category/edit/' + {category.idCategory}}">view</a>

[Software Engineer]

This thing worked for me in this case: <a th:href="${'localhost:8080/reset-password?otp='} + ${otp}">Click Here to reset your Password.</a>