有一个JavaScript对象数组作为ajax调用参数，而没有jquery？

Question

I'm trying to send an array of JavaScript objects to my ASP.Net MVC controller without using jQuery . I have a simple array of JavaScript objects like this...

var data = [];

data.push(new person(1, "David"));
data.push(new person(2, "Karine"));
data.push(new person(2, "Annie"));
...etc

function person(_id, _name) {
    this.id = _id;
    this.name = _name;
}

...and I would like to have it as a parameter of an ajax call like this:

var xmlhttp = new XMLHttpRequest();

xmlhttp.onreadystatechange = function () {
    if (xmlhttp.readyState == 4) {
            if (xmlhttp.status == 200) {
                    var obj = JSON.parse(xmlhttp.responseText);
                        for (var i = 0; i < obj.length; i++) {                                                
                            if (i == 1) {
                                    alert(obj[i].name);}
                        }
                }
                else {
                    alert('There is an error');
                }
    }
};

xmlhttp.open("GET", "/Home/AjaxTester?id=15&name=dave", true);                             
xmlhttp.send();

The way I found so far to pass parameters to an ajax call, which is ...Home/AjaxTester?id=15&name=dave , works fine for basic types, but I can't find a way to do the same with more "complex" types. I'm open to new ways to parameterize my ajax call if anything better, or even a new way to make an ajax call, as long as it is pure JavaScript, no library, no framework, or whatever.

Here's my MVC controller...

public JsonResult AjaxTester(List<Person> _person)
{
    //Whatever Logic...

    return Json(_someObjects);
}

...and the class of the received parameter

public class Person
{
    public int id { get; set; } = 0;      
        public string name { get; set; } = "";

        public Person(int _id, string _name)
        {
            this.id = _id;
            this.name = _name;
        }
}

Answer 1

您需要在参数之前使用FromUri命令，如下所示：

public JsonResult AjaxTester(FromUri List<Person> _person)

Answer 2

You need to change your http method from GET to POST.

xmlhttp.open("POST", "/Home/AjaxTester?id=15&name=dave", true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(JSON.stringify(data)); 

https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send

Make sure you add the setRequestHeader. If you are sending a json object then change the request header to the following:

xhr.setRequestHeader("Content-type", "application/json");

I would also recommend removing the query parameter and updating the controller to accept this type of object. You may also need to add the [FromBody] in next to that parameter.

And your controller should be updated similar to

public JsonResult AjaxTester([FromBody] List<Person> _person)