在 Go 模板中包含 js 文件 [英] Include js file in Go template
问题描述
我最近开始学习围棋.我得到了一个像 web 应用程序一样的示例.我有:
I started learning Go recently. I got a sample like as web app. I have:
/* tick-tock.go */
package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
)
// Content for the main html page..
var page = `<html>
<head>
<script type="text/javascript"
src="http://localhost:8081/jquery.min.js">
</script>
<style>
div {
font-family: "Times New Roman", Georgia, Serif;
font-size: 1em;
width: 13.3em;
padding: 8px 8px;
border: 2px solid #2B1B17;
color: #2B1B17;
text-shadow: 1px 1px #E5E4E2;
background: #FFFFFF;
}
</style>
</head>
<body>
<h2 align=center>Go Timer </h2>
<div id="output" style="width: 30%; height: 63%; overflow-y: scroll; float:left;"></div>
<div id="v1" style="width: 50%; height: 30%; overflow-y: scroll; float:left;"></div>
<div id="v2" style="width: 50%; height: 30%; overflow-y: scroll; float:left;"></div>
<input id="sett" type="submit" name="sett" value="Settings" onclick="changeUrl()">
<script type="text/javascript">
var myDelay;
$(document).ready(function ()
{
$("#output").append("Waiting for system time..");
myDelay = setInterval("delayedPost()", 1000);
});
function delayedPost()
{
$.post("http://localhost:9999/dev", "", function(data, status)
{
//$("#output").empty();
$("#output").prepend(data);
});
$.post("http://localhost:9999/v1", "", function(data, status) {
//$("#output").empty();
$("#v1").prepend(data);
});
$.post("http://localhost:9999/v2", "", function(data, status) {
//$("#output").empty();
$("#v2").prepend(data);
});
}
function delayedPost1()
{
$.post("http://localhost:9999/dev", "", function(data, status)
{
$("#output").prepend(data);
});
$.post("http://localhost:9999/v1", "", function(data, status)
{
$("#v1").prepend(data);
});
$.post("http://localhost:9999/v3", "", function(data, status)
{
$("#v2").prepend(data);
});
}
function changeUrl()
{
alert('salom');
clearInterval(myDelay);
}
</script>
</body>
</html>`
// handler for the main page.
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, page)
}
// handler to cater AJAX requests
func handlerDevs(w http.ResponseWriter, r *http.Request) {
//fmt.Fprint(w, time.Now().Format("Mon, 02 Jan 2006 15:04:05 MST"))
fmt.Fprint(w, "<font color=red>Dev1<br></font>")
}
func handlerV1(w http.ResponseWriter, r *http.Request) {
//fmt.Fprint(w, time.Now().Format("Mon, 02 Jan 2006 15:04:05 MST"))
fmt.Fprint(w, "<font color=blue>Vertical1<br></font>")
}
func handlerV2(w http.ResponseWriter, r *http.Request) {
//fmt.Fprint(w, time.Now().Format("Mon, 02 Jan 2006 15:04:05 MST"))
fmt.Fprint(w, "<font color=green>Vertical2<br></font>")
}
func main() {
http.HandleFunc("/", handler)
http.HandleFunc("/dev", handlerDevs)
http.HandleFunc("/v1", handlerV1)
http.HandleFunc("/v2", handlerV2)
log.Fatal(http.ListenAndServe(":9999", nil))
http.HandleFunc("/jquery.min.js", SendJqueryJs)
panic(http.ListenAndServe(":8081", nil))
}
func SendJqueryJs(w http.ResponseWriter, r *http.Request) {
data, err := ioutil.ReadFile("jquery.min.js")
if err != nil {
http.Error(w, "Couldn't read file", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/javascript")
w.Write(data)
}
我无法加载本地 jquery.min.js.当我编写 src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" 时，它已加载.如何加载本地js文件?我不擅长用 Go 编写代码，也没有编写完整的代码.所以请尽量解释得很简单.提前致谢！
I couldn't load local jquery.min.js. When I wrote src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" it was loaded. How can I load local js file? I am not good at coding in Go and I did not write full code. So please try to explain very simple. Thanks in advance!
推荐答案
你需要一个 Handler 或 HandlerFunc 它将在请求时将文件内容 (jquery.min.js) 发送到 Web 浏览器.
You need a Handler or a HandlerFunc which will send the file content (jquery.min.js) to the web browser when requested.
您有 3 个选择:
这是更复杂的解决方案.它看起来像在您的处理程序函数中您读取文件的内容，设置适当的响应内容类型(application/javascript)并发送内容(这是一个 []byte>) 回复.
This is the more complex solution. It would look like in your handler function you read the content of the file, set proper response content type (application/javascript) and send the content (which is a []byte) to the response.
注意事项:读取文件时，必须指定绝对路径.如果您指定相对路径，请确保该文件位于您启动应用程序的当前文件夹(工作目录)中.
Things to look out for: When reading the file, you have to specify an absolute path. If you specify a relative path, be sure the file is in the current folder (working directory) you start your app from.
示例:
func SendJqueryJs(w http.ResponseWriter, r *http.Request) {
data, err := ioutil.ReadFile("jquery.min.js")
if err != nil {
http.Error(w, "Couldn't read file", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/javascript; charset=utf-8")
w.Write(data)
}
func main() {
http.HandleFunc("/jquery.min.js", SendJqueryJs)
panic(http.ListenAndServe(":8081", nil))
}
上面的例子只能为请求提供 1 个文件:jquery.min.js:
The above example is capable of serving only 1 file: jquery.min.js for the request:
http://localhost:8081/jquery.min.js
利用http.ServeFile()
这更容易:函数 http.ServeFile() 能够将一个文件的内容发送到指定的响应.您仍然需要创建一个函数或处理程序来使用它，但它会为您完成剩下的工作:
Utilizing http.ServeFile()
This is much easier: The function http.ServeFile() is capable of sending the content of one file to the specified response. You still need to create a function or handler to use it, but it does the rest for you:
func SendJqueryJs(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "jquery.min.js")
}
利用http.FileServer()
如果你需要提供多个静态文件，这是FileServer() 函数很方便，它会返回一个 Handler，它会自动提供来自本地文件系统的文件，这些文件是您指定的根文件夹的后代.
Utilizing http.FileServer()
If you need to serve multiple static files, this is where FileServer() function comes handy which returns you a Handler which automatically serves files from your local file system that are descendants of the root folder you specify.
这个解决方案更加灵活:它可以发送多种类型的多个文件，自动检测和设置内容类型.处理程序还能够呈现 HTML 页面，以列出目录内容以及指向文件和父/子文件夹的链接.
This solution is much more flexible: it can send many files of multiple types, detects and sets content type automatically. The handler is also capable of rendering HTML pages for listing directory content with links to the files and to parent/child folders.
示例:
http.Handle("/tmpfiles/",
http.StripPrefix("/tmpfiles/", http.FileServer(http.Dir("/tmp"))))
这将在 URL /tmpfiles/ 注册一个 Handler，它提供在 /tmp 文件夹中的本地文件系统中找到的文件.例如下面的
