Submit form data: jQuery ajax() is implemented using serialize() (code attached)

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1. Select the student information to be deleted

2. Click the delete selected button, take out the value in the check box and submit it to the background

3. Get the selected id in the background

4. The front-end also deletes the data

Front-end code:

nbsp;html>


    <meta>
    <title>Title</title>


<h1 id="学生信息列表">学生信息列表</h1>
<input>
//表格外面加一个form表单包括table,为了序列化表单
//里面不需要添加method..就给一个id就行了

                                                                                                         

编号	姓名	性别	年龄	班级	全选

<script></script> <script> //页面加载时初始化数据（数据库读取数据） $(function () { $.ajax("stu",{ type:"post", success:function (data) { //后台响应回来 json 格式的数据 //循环遍历学生信息列表 $.each(data,function (index,obj) { $("#tab").append( "<tr>"+ "<td>"+obj.sid+""+ "<td>"+obj.sname+""+ "<td>"+obj.ssex+""+ "<td>"+obj.sage+""+ "<td>"+obj.clazz.cname+""+ // 注意！！！ 在input里面需要 添加name，为了后台读取选中的值 req.getParameterValues("stuId"); "<td><input type=&#39;checkbox&#39; name=&#39;stuId&#39; value=&#39;"+obj.sid+"&#39;>"+ "" ); }); //全选/全不选 var i=0; $("#selects").on("click",function () { if(i==0){ $("#tab :checkbox").prop("checked",true); i=1; }else{ $("#tab :checkbox").prop("checked",false); i=0; } }) //删除 $(&#39;#del&#39;).on("click",function () { //取出表单序列化的值 var param=$(&#39;#f&#39;).serialize(); //用ajax提交序列化的值 $.get("dels",param,function (data) { if(data==200){ //如果在后台返回来200数字表示后台在数据库已经删除成功 //后台删除成功之后前端用jQuery也随之删除对应的节点,为了不用重新再查询一遍数据 $(".box :checked").parent().parent().remove(); }else{ alert("删除失败！"); } }) /* * 也可以这种方式提交 * $.ajax("dels",{ type: &#39;get&#39;, data: $("#f").serialize(), success: function(data) { // your code ... } }); * */ }); } }); }) </script>

Backend code: (Only the deleted Servlet code is attached)

@WebServlet("/dels")
public class DeleteServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //取出提交过来表单选中序列化的值 name都为stuId的
        //取出来是一个String[]数组
        String[] sids=req.getParameterValues("stuId");
        for (String str:sids) {
            System.out.println("获取id"+str);
        }
        //实例化dao方法
        StudentDao dao =new StudentDao();
        //调用删除的方法 返回int[]数组
        int[] row=dao.studelete(sids);
        //只需判断有没有数据即可，有就响应200表示成功后台删除成功，否则500删除失败
        resp.getWriter().println(row!=null?200:500);
    }
}

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