Question

当我按下我的python表单上的按钮时，我想添加新标签并将其放在网格上。当我按下按钮时，什么也没发生。

附上我的代码：

from Tkinter import *

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        topiclbl.grid()
        topictxt = Text(self,height=1, width=30,font=(12))
        topictxt.grid()
        searchbtn = Button(self,text = 'Search Videos',command='search')
        searchbtn.grid()

    def search(self):

        message = 'Searching...'
        self.topictxt.insert(0.0,message)
        searchlbl = Label(self,text = message,font=(12))
        searchlbl.grid()


root = Tk()
root.title('Video Search')
root.geometry('600x600')
app=Application(root)
root.mainloop()

Answer 1

创建时，您应该将实际功能传递给Button

e.g。

searchbtn = Button(self,text = 'Search Videos',command=self.search)

Answer 2

代码中的一些问题：

您在command参数中引用了错误的方法名称，它应该是：

searchbtn = Button(self,text = 'Search Videos',command=self.search)

另外，你有一些属性问题：

您无法访问此方法之外的topictxt方法中定义的create_widget，除非您将其作为实例属性，这样：

self.topiclbl = Label(self,text = 'Enter topic for search',font=(12)) ......其余部分也一样。所以作为一个解决方案：

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        self.topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        self.topiclbl.grid()
        self.topictxt = Text(self,height=1, width=30,font=(12))
        self.topictxt.grid()
        self.searchbtn = Button(self,text = 'Search Videos',command=self.search)
        self.searchbtn.grid()

    def search(self):

        message = 'Searching...'
        self.topictxt.insert(0.0,message)
        self.searchlbl = Label(self,text = message,font=(12))
        self.searchlbl.grid()

另一种方法是使用lambda传递你想要的对象（标签）：

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        topiclbl.grid()
        topictxt = Text(self,height=1, width=30,font=(12))
        topictxt.grid()
        searchbtn = Button(self,text = 'Search Videos',command=lambda: self.search(topictxt))
        searchbtn.grid()

    def search(self, wdgt):

        message = 'Searching...'
        wdgt.insert(0.0,message)
        searchlbl = Label(self,text = message,font=(12))
        searchlbl.grid()

无法为python Tkinter添加标签

2 个答案: