jQuery ajax 简单的实例

版权声明: https://blog.csdn.net/weixin_40550726/article/details/82951617

通过jQuery ajax实现从服务器查询数据,返回给前端并显示到html页面

html文件

<!DOCTYPE html>
<html lang="zh-CN" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>使用 jQuery validate 表单验证</title>
    <script th:src="@{/scripts/jquery-3.3.1.min.js}"></script>
    <script th:src="@{/scripts/jquery.validate.min.js}"></script>
    <script th:src="@{/scripts/messages_zh.min.js}"></script>
    <script th:src="@{/scripts/user/login.js}"></script>
</head>
<body>
<form id="form1" action="/userLogin">
    <input type="text" id="userName" class="userName" name="userName"><br>
    <input type="email" id="email" name="email"><br>
    <select id="depertmentId" name="departmentId">
    </select><br>
    <input type="password" id="password" class="password" name="password"><br>
    <input type="submit" value="login">
</form>
</body>
</html>

login.js文件



function findAllDepts() {
    $.ajax({
        async : false,    //表示请求是否异步处理
        type : "post",    //请求类型
        url : "/getDepts",//请求的 URL地址
        dataType : "json",//返回的数据类型
        success: function (data) {
          console.log(data);  //在控制台打印服务器端返回的数据
          for(var i=0;i<data.length;i++){
              console.log(data[i].deptId+" "+data[i].deptName);
          }
            $("select[name='depertmentId']").empty();
            $("select[name='depertmentId']").append('<option value="">——请选择——</option>');
            for(var i=0;i<data.length;i++){
                var html ='<option value="'+data[i].deptId+'">';
                html +=data[i].deptName + '</option>';
                $("select[name='departmentId']").append(html);  //将数据显示在html页面
            }
        },
        error:function (data) {
            alert(data.result);
        }
    });
};

$(document).ready(function () {
   findAllDepts();  //页面加载完成就执行该方法
});

后端对应的请求方法(项目为springboot项目)

package com.njxz.demo.controller;

import com.njxz.demo.domain.Department;
import com.njxz.demo.domain.User;
import com.njxz.demo.service.IUserService;
import org.apache.ibatis.annotations.Param;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.List;

@RestController
public class UserController {

    @Resource
    private IUserService userService;
  

    @RequestMapping("/getDepts")
    public List<Department> getDepts(){ //查找所有部门
        List<Department> depts=userService.findAllDepts();
        return depts;
    }
}

后端返回的对象类

package com.njxz.demo.domain;

public class Department {
    private Integer deptId;

    private String deptName;

    public Integer getDeptId() {
        return deptId;
    }

    public void setDeptId(Integer deptId) {
        this.deptId = deptId;
    }

    public String getDeptName() {
        return deptName;
    }

    public void setDeptName(String deptName) {
        this.deptName = deptName == null ? null : deptName.trim();
    }
}

控制台打印的数据信息

html页面显示效果

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转载自blog.csdn.net/weixin_40550726/article/details/82951617