Thymeleaf:向当前url添加参数

I'm at

我在

http://example.com/some/page?p1=11

and I want to add a parameter to current url without having to redefine it:

我想在当前url中添加一个参数，而不需要重新定义它:

http://example.com/some/page?p1=11&p2=32

with something like:

可以这样说:

<a th:href="@{?(p2=32)}">Click here</a>

but the above code return http://example.com/some/page?&p2=32 (removes the p1 parameter).

但是上面的代码返回http://example.com/some/page?p2=32(删除p1参数)。

How can I do it using Thymeleaf?

我怎么用胸腺叶做呢?

4 个解决方案

#1

The easiest solution is concatenating "requestURI" and "queryString". Here is example:

最简单的解决方案是连接“requestURI”和“queryString”。下面是例子:

<div th:with="currentUrl=(${#httpServletRequest.requestURI + '?' + #strings.defaultString(#httpServletRequest.queryString, '')})">
   <a th:href="@{${currentUrl}(myparam=test)}">click here</a>
</div>

Result for "http://localhost:8080/some-page?param1=1":

结果“http://localhost:8080 /某些页面? param1 = 1”:

 http://localhost:8080/some-page?param1=1&myparam=test

Result for "http://localhost:8080/some-page":

结果“http://localhost:8080 /某些页面”:

 http://localhost:8080/some-page?&myparam=test

Drawback:
Thymeleaf doesn't overwrite parameters - only adds parameters to URL. So if you user click once again to that URL, the result will be:

缺点:Thymeleaf不覆盖参数—只向URL添加参数。因此，如果用户再次单击该URL，结果将是:

http://localhost:8080/some-page?param1=1&myparam=test&myparam=test

References:
http://forum.thymeleaf.org/How-to-link-to-current-page-and-exchange-parameter-td4024870.html

引用:http://forum.thymeleaf.org/How-to-link-to-current-page-and-exchange-parameter-td4024870.html

EDIT:

编辑:

Here is some workaround, which removes parameter "myparam" from the URL:

下面是一些变通方法，它从URL中删除参数“parmyam”:

<div th:with="currentUrl=(${@currentUrlWithoutParam.apply('myparam')})">
    <a th:href="@{${currentUrl}(myparam=test)}">click here</a>
</div>

Next in Spring configuration:

下一个在Spring配置:

@Bean
public Function<String, String> currentUrlWithoutParam() {
    return param ->   ServletUriComponentsBuilder.fromCurrentRequest().replaceQueryParam(param).toUriString();
}

For more "global" solution, I would try extending processor for attribute "th:href" or creating my own attribute. I'm not a thymeleaf expert, just facing similar problem.

对于更多的“全局”解决方案，我将尝试扩展处理器的属性“th:href”或创建我自己的属性。我不是thymeleaf专家，只是遇到了类似的问题。

#2

You can use URI builder, directly from Thymeleaf.

您可以直接从Thymeleaf使用URI builder。

<span th:with="urlBuilder=${T(org.springframework.web.servlet.support.ServletUriComponentsBuilder).fromCurrentRequest()}"
      th:text="${urlBuilder.replaceQueryParam('p2', '32').toUriString()}">
</span>

For URL http://example.com/some/page?p1=11 prints out:

在URL http://example.com/some/page?p1 = 11打印出:

http://example.com/some/page?p1=11&p2=32

Explained:

解释道:

SpEL T operator is used for accessing ServletUriComponentsBuilder type.
SpEL T操作符用于访问servleturientsbuilder类型。
An instance created by factory method fromCurrentRequest is saved to urlBuilder variable.
工厂方法fromCurrentRequest创建的实例被保存到urlBuilder变量中。
A param is added or replaced in the query string by replaceQueryParam method, and then the URL is built.
通过replaceQueryParam方法在查询字符串中添加或替换参数，然后构建URL。

Pros:

优点:

Safe solution.
安全解决方案。
No trailing ? in case of empty query string.
不落后?如果查询字符串为空。
No extra bean in Spring context.
在Spring上下文中没有额外的bean。

Cons:

缺点:

It is quite verbose.
很详细。

! Be aware that solution above creates one instance of the builder. This means that the builder cannot be reused because it still modifies a single URL. For multiple URLs on a page you have to create multiple builders, like this:

!请注意，上面的解决方案创建了构建器的一个实例。这意味着构建器不能被重用，因为它仍然修改单个URL。对于页面上的多个url，您必须创建多个构建器，如下所示:

<span th:with="urlBuilder=${T(org.springframework.web.servlet.support.ServletUriComponentsBuilder)}">
    <span th:text="${urlBuilder.fromCurrentRequest().replaceQueryParam('p2', 'whatever').toUriString()}"></span>
    <span th:text="${urlBuilder.fromCurrentRequest().replaceQueryParam('p3', 'whatever').toUriString()}"></span>
    <span th:text="${urlBuilder.fromCurrentRequest().replaceQueryParam('p4', 'whatever').toUriString()}"></span>
</span>

For http://example.com/some/page prints:

为http://example.com/some/page打印:

http://example.com/some/page?p2=whatever 
http://example.com/some/page?p3=whatever     
http://example.com/some/page?p4=whatever

#3

This will work for you, even in Unicode:

即使在Unicode中，这也适用:

 <ul class="pagination">
                <li th:if="${currentPage > 1}"><a th:href="'/search?key=' + ${param.key[0]} + '&amp;page=' +   ${currentPage-1}">Previous</a></li>

                      <li th:each="i : ${#numbers.sequence( 1, total+1)}" th:class="${i==currentPage}?active:''">
                            <a th:href="'/search?key=' + ${param.key[0]} + '&amp;page=' +   ${i}" th:inline="text">
                            [[${i}]] <span  class="sr-only">(current)</span>
                            </a>
                      </li>
                      <li><a th:if="${total + 1 > currentPage}" th:href="'/search?key=' + ${param.key[0]} + '&amp;page=' +   ${currentPage+1}">Next</a></li>
            </ul>

#4

th:href="@{/your/link?parameter=__${appendParameter}__}"

#1