我刚开始学习 Web 开发、Go 和 Ajax，但我很难看出哪里出了问题。我试图简单地在客户端和服务器之间来回发送数据。通过 Ajax 请求，我将数据从表单发送到服务器，但它似乎没有到达服务器，因为日志没有打印“in posthandler”，这让我认为 ajax 请求有问题。附件是 main.go、index.html 和 js/getData.js 以及所有相关代码。
主.go
package main
import (
"fmt"
"net/http"
"io/ioutil"
"log"
)
var INDEX_HTML []byte
func main(){
fmt.Println("starting server on http://localhost:8888/\nvalue is %s", value)
http.HandleFunc("/", IndexHandler)
http.HandleFunc("/post", PostHandler)
http.ListenAndServe(":8888", nil)
}
func IndexHandler(w http.ResponseWriter, r *http.Request){
log.Println("GET /")
w.Write(INDEX_HTML)
}
func PostHandler(w http.ResponseWriter, r *http.Request){
r.ParseForm()
log.Println("in posthandler", r.Form)
var value = r.FormValue("textfield")
w.Write([]byte(value))
}
func init(){
INDEX_HTML, _ = ioutil.ReadFile("./html/index.html")
}
index.html
<!doctype html>
<html>
<head>
<title>Page Title</title>
<script src="js/getData.js"></script>
</head>
<body>
<form action="/post" method="post">
<textarea type="text" name="input" id="textfield"></textarea>
<br />
<input type="submit" name="button" id="button" value="Send" onclick="loadXMLDoc()"/>
</form>
<div id="fromserver">
</div>
</body>
</html>
js/getData.js
function loadXMLDoc() {
var xmlhttp;
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("fromserver").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("POST","post",true);
xmlhttp.send();
}
最佳答案
有两件事:
- 没有处理程序呈现 Assets (在本例中为 js/.)
- 由于“提交”HTML 元素，表单本身被提交。
这是你更新后的代码
主.go
package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
)
var INDEX_HTML []byte
func main() {
fmt.Println("starting server on http://localhost:8888/\nvalue is %s", "asdf")
http.HandleFunc("/", IndexHandler)
http.HandleFunc("/post", PostHandler)
serveSingle("/js/getData.js", "./js/getData.js")
http.ListenAndServe(":8888", nil)
}
func serveSingle(pattern string, filename string) {
http.HandleFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, filename)
})
}
func IndexHandler(w http.ResponseWriter, r *http.Request) {
log.Println("GET /")
w.Write(INDEX_HTML)
}
func PostHandler(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
log.Println("in posthandler", r.Form)
var value = r.FormValue("textfield")
w.Write([]byte(value))
}
func init() {
INDEX_HTML, _ = ioutil.ReadFile("./html/index.html")
}
index.html
<!doctype html>
<html>
<head>
<title>Page Title</title>
<script src="js/getData.js"></script>
</head>
<body>
<form action="/post" method="post">
<textarea type="text" name="input" id="textfield"></textarea>
<br />
<input type="button" name="button" id="button" value="Send" onclick="loadXMLDoc()"/>
</form>
<div id="fromserver">
</div>
</body>
</html>
关于Ajax 请求未发送到 Go Web 服务器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28138952/