问题描述
我有一个程序可以使用 Treeview 显示来自 MysqL 的一些数据。我想使用“刷新按钮”来更新它的内容,而不是再次终止并重新运行程序。我尝试过 self.destroy() 函数,但它关闭了选项卡并且没有重新打开选项卡。还有其他方法可以刷新 Treeview 吗?
class tab_four(Frame):
def __init__(self,*args,**kwargs):
Frame.__init__(self,**kwargs)
...
#tree.heading("#0",text = " ")
tree.heading("1",text = "Equipment Type")
tree.heading("2",text = "Total")
tree.heading("3",text = "Unavailable")
tree.heading("4",text = "Available")
#tree.column('#0',stretch = NO,minwidth = 0,width = 0)
tree.column('#1',stretch = YES,width = 100,anchor = CENTER)
tree.column('#2',anchor = CENTER)
tree.column('#3',anchor = CENTER)
tree.column('#4',anchor = CENTER)
command = "SELECT et.`Equipment Type`,COUNT(i.`Equipment Type`) Total,SUM(IF(`Status`='Unavailable',1,0)) Unavailable,SUM(IF(`Status`='Available',0)) Available FROM `Equipment Types` et LEFT JOIN Inventory i ON et.`Equipment Type` = i.`Equipment Type` GROUP BY 1 ORDER BY 1"
mycursor.execute(command)
display = mycursor.fetchall()
for row in display:
tree.insert("","end",values=row)
def refresh_clicked(self):
self.destroy()
self.__init__()
button_refresh = tk.Button(topframe,text = "Refresh",state = norMAL,command = self.refresh_clicked)
button_refresh.grid(row = 1,column = 2,sticky = W,padx = 5,pady = 2)
解决方法
尝试再次获取值,然后在删除现有值后插入新值,例如:
def refresh_clicked(self):
command = """SELECT et.`Equipment Type`,COUNT(i.`Equipment Type`) Total,SUM(IF(`Status`='Unavailable',1,0)) Unavailable,SUM(IF(`Status`='Available',0)) Available FROM `Equipment Types` et LEFT JOIN Inventory i ON et.`Equipment Type` = i.`Equipment Type` GROUP BY 1 ORDER BY 1"""
mycursor.execute(command)
display = mycursor.fetchall()
self.tree.delete(*self.tree.get_children()) # Delete all times inside the treeview
for row in display:
self.tree.insert('','end',value=row) # Insert newly fetched values
请注意,我使用了 self.tree
,因此您需要使用 Treeview
声明 self.tree
,并使用 self.tree
等执行所有其他方法。
我目前不在系统前,所以我希望这段代码可以工作并且尚未经过测试,如有任何错误和更改,请告诉我。
,你可以使用
for widgets in yourwidgetname.winfo_children():
widgets.destroy()
并通过调用初始化它们的函数重新初始化它
您可以通过这种方式销毁框架中的所有小部件,并且不会完全破坏您的框架。它会破坏它的子部件。