用 ajax 替换片段

Created: November-22, 2018

如果你想要替换网站的部分内容，ajax 是一种简单的方法。

你要根据所选值替换内容的 website.html ：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:th="http://www.thymeleaf.org">

    <head>
        <title>Index</title>
    </head>

    <body>
        <select id="selection">
            <option>Content 1</option>
            <option>Content 2</option>
        </select>

        <div id="replace_div">
            Content goes here
        </div>

        <!-- JQury from Google CDN -->
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

        <script>
            $(document).ready(function () {

                //call function when page is loaded
                getContent();

                //set on change listener
                $('#selection').change(getContent);

                function getContent() {

                    //create url to request fragment
                    var url = /content/;
                    if ($('#selection').val() === "Content 1") {
                        url = url + "content1";
                    } else {
                        url = url + "content2";
                    }

                    //load fragment and replace content
                    $('#replace_div').load(url);
                }
            })
        </script>
    </body>
</html>

并且 content.html 包含你要根据所选值包含的片段：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
    <head>
    </head>

    <body>
        <div th:fragment="content1">
            This is Content 1
        </div>

        <div th:fragment="content2">
            This is Content 2
         </div>
    </body>
</html>

最后但并非最不重要的是 Spring MVC ContentController.java ：

@Controller
@RequestMapping("content")
public class ContentController {

    @RequestMapping("")
    public String loadContent() {
        return "website";
    }

    @RequestMapping("content1")
    public String getContent1() {
        return "content::content1";
    }

    @RequestMapping("content2")
    public String getContent2() {
        return "content::content2";
    }
}