Example of ASP.NET jquery ajax passing parameters

The first type: GET delivery

Front-end ajax GET delivery: that is, adding parameters after the requested address, the length of the URL address is displayed, and the security is low

Backend reception: Request.QueryString["Parameter Name"]!

For example:

function LoadBar(id) {
  var project = id;
  var month = $("#txtMonth").val();
  $.ajax({
    type: "GET",
    async: false,
    url: 'GetProjectScore.aspx?project=' + project + '&month=' + month,
    dataType: 'json',
    beforeSend: function () {
    },
    success: function (msg) {
      if (msg) {
        optionBar.xAxis.categories = eval(msg.projectscore.orgname);
        optionBar.series = eval(msg.projectscore.series);
        var t = eval("(" + subtitle + ")");
        optionBar.subtitle = t.subtitle;
        chart = new Highcharts.Chart(optionBar);
      }
    },
    error: function () {
      alert('出错了啦!');
    }
  });

Second type: POST transmission

2.1 String Passing as a parameter

That is, the parameters passed are passed in the form of strings. dataType="text";

Front-end ajax POST delivery: a request to submit form data to the server. The data to be submitted is located in the entity behind the information header.

Background reception: Request.Form["Parameter name"]

For example:

$("input[name=returnfile]").click(function () {
           var returnflag = $(this).val();
           var guid = $(this).prev().html();
           $.ajax({
             type: "POST",
             async: "false",
             url: "returndata.aspx",
             data: "flag=" + returnflag + "&guid="+guid+"",
             success: function () {
             }
           });
         })

Background reception:

string flag=Request.Form["flag"];

string guid=Request.Form ["guid"];

2.2 JSON is passed as a parameter

that is, the parameters passed are passed in the form of json string. dataType="json";

Front-end ajax POST delivery: a request to submit form data to the server. The data to be submitted is located in the entity behind the information header.

Background reception:

StreamReader reader=new StreamReader(Request.InputStream);

string str = reader.ReadToEnd();

For example:

$("input[name=returnfile]").click(function () {
           var returnflag = $(this).val();
           var guid = $(this).prev().html();
           var str = "{'flag':'" + returnflag + "','guid':'" + guid + "'}";
           var json = eval("(" + json + ")");
           $.ajax({
             type: "POST",
             async: "false",
             url: "khdf_returndata.aspx",
 
             dataType:”JSON”
             data: json,
             success: function () {
             }
           });
         })

Background reception:

StreamReader reader=new StreamReader (Request.InputStream);

string str = reader.ReadToEnd();

After reading, newtonsoft does JSON processing

2.3 JSON Passed as a parameter

$(function () {
      $("#btnLogin").click(function () {
        // var username = $("#txtUserName").val();
        // var password = $("#txtPassword").val();
        // var paras = "username=" + username + "&password=" + password;
        // alert(paras);
        var data = {
          username: $("#txtUserName").val(),
          password:$("#txtPassword").val()
        }
        $.post("Home/CheckLogin", data, function (data) {
          alert(data);
        })
      })
    })
   
如果按照2.2post。则必须加上： contentType: "application/json"

Background reception:

[HttpPost]
    public ActionResult CheckLogin(string username,string password)
    {
      string name = username;
      string pwd = password;
      return View();
    }