我想在JavaScript中使用XMLHttpRequest发送一些数据。
假设我在HTML中有以下表单:
<form name="inputform" action="somewhere" method="post">
<input type="hidden" value="person" name="user">
<input type="hidden" value="password" name="pwd">
<input type="hidden" value="place" name="organization">
<input type="hidden" value="key" name="requiredkey">
</form>
如何在JavaScript中使用XMLHttpRequest编写等效内容?
当前回答
这帮助我，因为我想只使用xmlHttpRequest和post对象作为表单数据:
function sendData(data) {
var XHR = new XMLHttpRequest();
var FD = new FormData();
// Push our data into our FormData object
for(name in data) {
FD.append(name, data[name]);
}
// Set up our request
XHR.open('POST', 'https://example.com/cors.php');
// Send our FormData object; HTTP headers are set automatically
XHR.send(FD);
}
https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Sending_forms_through_JavaScript
其他回答
尝试使用json对象而不是formdata。下面是为我工作的代码。formdata也不适合我，因此我提出了这个解决方案。
var jdata = new Object();
jdata.level = levelVal; // level is key and levelVal is value
var xhttp = new XMLHttpRequest();
xhttp.open("POST", "http://MyURL", true);
xhttp.setRequestHeader('Content-Type', 'application/json');
xhttp.send(JSON.stringify(jdata));
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log(this.responseText);
}
}
只是为了让专题读者发现这个问题。我发现，只要你有一个给定的路径，接受的答案就可以工作，但如果你让它为空，它将在IE中失败。以下是我想到的:
function post(path, data, callback) {
"use strict";
var request = new XMLHttpRequest();
if (path === "") {
path = "/";
}
request.open('POST', path, true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.onload = function (d) {
callback(d.currentTarget.response);
};
request.send(serialize(data));
}
你可以这样写:
post("", {orem: ipsum, name: binny}, function (response) {
console.log(respone);
})
最小限度地使用FormData来提交AJAX请求
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge, chrome=1"/>
<script>
"use strict";
function submitForm(oFormElement)
{
var xhr = new XMLHttpRequest();
xhr.onload = function(){ alert (xhr.responseText); } // success case
xhr.onerror = function(){ alert (xhr.responseText); } // failure case
xhr.open (oFormElement.method, oFormElement.action, true);
xhr.send (new FormData (oFormElement));
return false;
}
</script>
</head>
<body>
<form method="post" action="somewhere" onsubmit="return submitForm(this);">
<input type="hidden" value="person" name="user" />
<input type="hidden" value="password" name="pwd" />
<input type="hidden" value="place" name="organization" />
<input type="hidden" value="key" name="requiredkey" />
<input type="submit" value="post request"/>
</form>
</body>
</html>
讲话
This does not fully answer the OP question because it requires the user to click in order to submit the request. But this may be useful to people searching for this kind of simple solution. This example is very simple and does not support the GET method. If you are interesting by more sophisticated examples, please have a look at the excellent MDN documentation. See also similar answer about XMLHttpRequest to Post HTML Form. Limitation of this solution: As pointed out by Justin Blank and Thomas Munk (see their comments), FormData is not supported by IE9 and lower, and default browser on Android 2.3.
这帮助我，因为我想只使用xmlHttpRequest和post对象作为表单数据:
function sendData(data) {
var XHR = new XMLHttpRequest();
var FD = new FormData();
// Push our data into our FormData object
for(name in data) {
FD.append(name, data[name]);
}
// Set up our request
XHR.open('POST', 'https://example.com/cors.php');
// Send our FormData object; HTTP headers are set automatically
XHR.send(FD);
}
https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Sending_forms_through_JavaScript
使用现代JavaScript!
我建议你研究一下fetch。它是ES5的对等版本，使用Promises。它可读性更强，也更容易定制。
Const url = "http://example.com"; fetch (url, { 方法:"POST"， body: new FormData(document.getElementById("inputform"))， //——或—— // body: JSON.stringify({ // user: document.getElementById('user').value， / /…… / /}) })( Response => Response .text() // .json()，等等 //与function(response)相同{return response.text();} ) ( HTML => console.log(HTML) ）;
在Node.js中，你需要使用以下方法导入fetch:
const fetch = require("node-fetch");
如果你想同步使用它(不工作在顶级范围):
const json = await fetch(url, optionalOptions)
.then(response => response.json()) // .text(), etc.
.catch((e) => {});
更多信息:
Mozilla的文档
我可以使用吗(2020年11月96%)
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