英文:
How to implement AJAX in GAE GO
问题
我知道可以使用jQuery Ajax进行ajax post，但是调用会返回一个值，文本，html还是json？谢谢！
英文:
I know it is possible to do an ajax post using jQuery Ajax but how does the call would return a value, text, html or json? Thanks!
答案1
得分: 9
这里有一个非常好的关于在Go中创建Web应用程序的入门指南：http://golang.org/doc/articles/wiki/
处理POST请求的示例在saveHandler函数中给出：
func saveHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
body := r.FormValue("body")
p := &Page{Title: title, Body: []byte(body)}
p.save()
http.Redirect(w, r, "/view/"+title, http.StatusFound)
}
在你的情况下，不要重定向，只需返回一个字符串，例如：
func saveHandler(w http.ResponseWriter, r *http.Request) {
value := r.FormValue("inputVal")
err := saveFunction(value)
if err == nil {
fmt.Fprintf(w, "OK")
} else {
fmt.Fprintf(w, "NG")
}
}
func main() {
http.HandleFunc("/", indexHandler)
http.HandleFunc("/save", saveHandler)
http.ListenAndServe(":8080", nil)
}
..然后（因为你使用了jQuery），使用回调函数处理它，如http://api.jquery.com/jQuery.post/中所示：
$.post('/save', {inputVal: "banana"}, function(data) {
if(data == "OK") {
alert("Saved!");
} else {
alert("Save Failed!");
}
});
如果你想返回JSON，你需要学习如何编组你的数据，然后像上面返回字符串一样返回它。
这里是关于JSON文档的链接：http://golang.org/pkg/encoding/json/#Marshal
熟悉如何使用它的一个好方法是在http://play.golang.org上进行一些实验，编组和解组结构并将其打印出来。这是一个示例：http://play.golang.org/p/OHVEGzD8KW
英文:
There's a very good primer on creating web applications in Go here: http://golang.org/doc/articles/wiki/
The example for handling a POST is given in the saveHandler function:
func saveHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
body := r.FormValue("body")
p := &Page{Title: title, Body: []byte(body)}
p.save()
http.Redirect(w, r, "/view/"+title, http.StatusFound)
}
In your case, instead of redirecting, just return a string eg.
func saveHandler(w http.ResponseWriter, r *http.Request) {
value := r.FormValue("inputVal")
err := saveFunction(value)
if err == nil {
fmt.Fprintf(w, "OK")
} else {
fmt.Fprintf(w, "NG")
}
}
func main() {
http.HandleFunc("/", indexHandler)
http.HandleFunc("/save", saveHandler)
http.ListenAndServe(":8080", nil)
}
.. and (since you're using jQuery), handle it with a callback as shown in http://api.jquery.com/jQuery.post/:
$.post('/save', {inputVal: "banana"}, function(data) {
if(data == "OK") {
alert("Saved!");
} else {
alert("Save Failed!");
}
});
If you want to return JSON, you'll need to learn how to Marshal your data, then return that like we return the string above.
Here is a link to to the JSON documentation: http://golang.org/pkg/encoding/json/#Marshal
A good way to get familiar with how to use it is to have a play around on http://play.golang.org, marshalling and unmarshalling structs and printing them out. Here's an example: http://play.golang.org/p/OHVEGzD8KW
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