Go语言如何用GoJS编写流程图
时间: 2023-07-20 11:44:09 浏览: 67
使用GoJS来编写流程图,需要先安装GoJS库,可以使用以下命令进行安装:
```
go get github.com/NorthwoodsSoftware/GoJS
```
安装完成后,可以使用以下代码来创建一个简单的流程图:
```Go
package main
import (
"fmt"
"os"
"net/http"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
"github.com/NorthwoodsSoftware/GoJS"
)
func main() {
r := mux.NewRouter()
r.HandleFunc("/ws", wsHandler)
r.PathPrefix("/").Handler(http.FileServer(http.Dir("./")))
fmt.Println("Listening on :8080...")
http.ListenAndServe(":8080", r)
}
func wsHandler(w http.ResponseWriter, r *http.Request) {
upgrader := websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
fmt.Println("Failed to upgrade:", err)
return
}
defer conn.Close()
fmt.Println("WebSocket connection established.")
var $ = gojs.GraphObject.make;
diagram := $(
gojs.Diagram,
"myDiagramDiv",
{
"undoManager.isEnabled": true
}
);
diagram.model = gojs.Model.fromJson({
"nodeDataArray": [
{"key": "Alpha"},
{"key": "Beta"},
{"key": "Gamma"}
],
"linkDataArray": [
{"from": "Alpha", "to": "Beta"},
{"from": "Beta", "to": "Gamma"}
]
});
diagram.addDiagramListener("ObjectSingleClicked", func(e *gojs.DiagramEvent) {
node := e.Subject.Part
fmt.Println("Node clicked:", node.Data)
})
for {
_, msg, err := conn.ReadMessage()
if err != nil {
fmt.Println("Failed to read message:", err)
break
}
fmt.Printf("Received message: %s\n", msg)
}
fmt.Println("WebSocket connection closed.")
}
```
以上代码创建了一个基于WebSocket的Web应用程序,用于显示一个简单的流程图,并在用户单击流程图中的节点时打印节点信息。这个应用程序使用了Gorilla WebSocket库和GoJS库,需要在项目中引入这两个库。
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