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How to check QLabel exist or not in PyQT5

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  • K Offline
    K Offline
    krsapril24
    wrote on last edited by
    #1

    I am creating dynamically QLabel and QLineEdit, Before creating them i need to know if already label already exist or not. Please helpme, Thanks in Advance

    JonBJ 1 Reply Last reply
    0
    • K krsapril24

      I am creating dynamically QLabel and QLineEdit, Before creating them i need to know if already label already exist or not. Please helpme, Thanks in Advance

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by JonB
      #2

      @krsapril24
      You have to define what you mean by "if already label already exist or not.". Any label that is a child of such and such? A label with same text? A label where you previously used setObjectName() to something we can search for now?

      Or, maybe you mean: when you first create a widget you often save it in self (e.g. a QDialog), and you want to know if you have previously done so?

      If that's what you mean, you can do that by putting into your dialog's __init__():

      self.label = None
      self.lineedit = None
      

      and you can create first time only with:

      if not self.label:
          self.label = QLabel()
          self.lineedit = QLineEdit()
      

      Or what?

      1 Reply Last reply
      2
      • K Offline
        K Offline
        krsapril24
        wrote on last edited by
        #3

        Hi created like this

        if(i==1):

                    '''self.formLayout.removeWidget(self.childCmpName1LineEdit.hide())
                    self.formLayout.removeWidget(self.childCmpName1)
                    self.formLayout.removeWidget(self.parentCmpName2LineEdit)
                    self.formLayout.removeWidget(self.parentCmpName2)
                    self.formLayout.removeWidget(self.self.childCmpNameLineEdit)
                    self.formLayout.removeWidget(self.self.childCmpName)
                    self.formLayout.removeWidget(self.parentCmpName3LineEdit)
                    self.formLayout.removeWidget(self.parentCmpName3)
                    self.formLayout.removeWidget(self.branchNameLineEdit)
                    self.formLayout.removeWidget(self.branchName)'''
        
                    self.parentCmpName1 = QLabel(self.formLayoutWidget)
                    self.parentCmpName1.setObjectName("parentCompanyName")
                    self.parentCmpName1.setText("Parent Company Name* : ")
                    self.formLayout.setWidget(13, QFormLayout.LabelRole, self.parentCmpName1)
                    self.parentCmpName1LineEdit = QLineEdit(self.formLayoutWidget)
                    self.formLayout.setWidget(13, QFormLayout.FieldRole, self.parentCmpName1LineEdit)
            elif(i==2):
                '''self.formLayout.removeWidget(self.parentCmpName1LineEdit)
                self.formLayout.removeWidget(self.parentCmpName1)'''
        
                if(self.parentCmpName1.hasSelectedText()):
                    print("hi")
        
                '''if(self.parentCmpName1LineEdit):
                    self.parentCmpName1LineEdit.hide()'''
        
                self.parentCmpName2 = QLabel(self.formLayoutWidget)
                self.parentCmpName2.setObjectName("parentCompanyName")
                self.parentCmpName2.setText("Parent Company Name* : ")
                self.formLayout.setWidget(13, QFormLayout.LabelRole, self.parentCmpName2)
                self.parentCmpName2LineEdit = QLineEdit(self.formLayoutWidget)
                self.formLayout.setWidget(13, QFormLayout.FieldRole, self.parentCmpName2LineEdit)
        
                self.childCmpName = QLabel(self.formLayoutWidget)
                self.childCmpName.setObjectName("childCompanyName")
                self.childCmpName.setText("Child Company Name* : ")
                self.formLayout.setWidget(14, QFormLayout.LabelRole, self.childCmpName)
                self.childCmpNameLineEdit = QLineEdit(self.formLayoutWidget)
                self.formLayout.setWidget(14, QFormLayout.FieldRole, self.childCmpNameLineEdit)
            elif(i==3):
                '''self.formLayout.removeWidget(self.parentCmpName1LineEdit)
                self.formLayout.removeWidget(self.parentCmpName1)
                self.formLayout.removeWidget(self.parentCmpName2LineEdit)
                self.formLayout.removeWidget(self.parentCmpName2)
                self.formLayout.removeWidget(self.self.childCmpNameLineEdit)
                self.formLayout.removeWidget(self.self.childCmpName)'''
        
                self.parentCmpName3 = QLabel(self.formLayoutWidget)
                self.parentCmpName3.setObjectName("parentCompanyName")
                self.parentCmpName3.setText("Parent Company Name* : ")
                self.formLayout.setWidget(13, QFormLayout.LabelRole, self.parentCmpName3)
                self.parentCmpName3LineEdit = QLineEdit(self.formLayoutWidget)
                self.formLayout.setWidget(13, QFormLayout.FieldRole, self.parentCmpName3LineEdit)
        
                self.childCmpName1 = QLabel(self.formLayoutWidget)
                self.childCmpName1.setObjectName("childCompanyName")
                self.childCmpName1.setText("Child Company Name* : ")
                self.formLayout.setWidget(14, QFormLayout.LabelRole, self.childCmpName1)
                self.childCmpName1LineEdit = QLineEdit(self.formLayoutWidget)
                self.formLayout.setWidget(14, QFormLayout.FieldRole, self.childCmpName1LineEdit)
        
                self.branchName = QLabel(self.formLayoutWidget)
                self.branchName.setObjectName("branchName")
                self.branchName.setText("Branch Name* : ")
                self.formLayout.setWidget(15, QFormLayout.LabelRole, self.branchName)
                self.branchNameLineEdit = QLineEdit(self.formLayoutWidget)
                self.formLayout.setWidget(15, QFormLayout.FieldRole, self.branchNameLineEdit)
        

        i want to remove repeated Qlabels and QLine edits on different combobox selection. Kindly help me.

        JonBJ 1 Reply Last reply
        0
        • K krsapril24

          Hi created like this

          if(i==1):

                      '''self.formLayout.removeWidget(self.childCmpName1LineEdit.hide())
                      self.formLayout.removeWidget(self.childCmpName1)
                      self.formLayout.removeWidget(self.parentCmpName2LineEdit)
                      self.formLayout.removeWidget(self.parentCmpName2)
                      self.formLayout.removeWidget(self.self.childCmpNameLineEdit)
                      self.formLayout.removeWidget(self.self.childCmpName)
                      self.formLayout.removeWidget(self.parentCmpName3LineEdit)
                      self.formLayout.removeWidget(self.parentCmpName3)
                      self.formLayout.removeWidget(self.branchNameLineEdit)
                      self.formLayout.removeWidget(self.branchName)'''
          
                      self.parentCmpName1 = QLabel(self.formLayoutWidget)
                      self.parentCmpName1.setObjectName("parentCompanyName")
                      self.parentCmpName1.setText("Parent Company Name* : ")
                      self.formLayout.setWidget(13, QFormLayout.LabelRole, self.parentCmpName1)
                      self.parentCmpName1LineEdit = QLineEdit(self.formLayoutWidget)
                      self.formLayout.setWidget(13, QFormLayout.FieldRole, self.parentCmpName1LineEdit)
              elif(i==2):
                  '''self.formLayout.removeWidget(self.parentCmpName1LineEdit)
                  self.formLayout.removeWidget(self.parentCmpName1)'''
          
                  if(self.parentCmpName1.hasSelectedText()):
                      print("hi")
          
                  '''if(self.parentCmpName1LineEdit):
                      self.parentCmpName1LineEdit.hide()'''
          
                  self.parentCmpName2 = QLabel(self.formLayoutWidget)
                  self.parentCmpName2.setObjectName("parentCompanyName")
                  self.parentCmpName2.setText("Parent Company Name* : ")
                  self.formLayout.setWidget(13, QFormLayout.LabelRole, self.parentCmpName2)
                  self.parentCmpName2LineEdit = QLineEdit(self.formLayoutWidget)
                  self.formLayout.setWidget(13, QFormLayout.FieldRole, self.parentCmpName2LineEdit)
          
                  self.childCmpName = QLabel(self.formLayoutWidget)
                  self.childCmpName.setObjectName("childCompanyName")
                  self.childCmpName.setText("Child Company Name* : ")
                  self.formLayout.setWidget(14, QFormLayout.LabelRole, self.childCmpName)
                  self.childCmpNameLineEdit = QLineEdit(self.formLayoutWidget)
                  self.formLayout.setWidget(14, QFormLayout.FieldRole, self.childCmpNameLineEdit)
              elif(i==3):
                  '''self.formLayout.removeWidget(self.parentCmpName1LineEdit)
                  self.formLayout.removeWidget(self.parentCmpName1)
                  self.formLayout.removeWidget(self.parentCmpName2LineEdit)
                  self.formLayout.removeWidget(self.parentCmpName2)
                  self.formLayout.removeWidget(self.self.childCmpNameLineEdit)
                  self.formLayout.removeWidget(self.self.childCmpName)'''
          
                  self.parentCmpName3 = QLabel(self.formLayoutWidget)
                  self.parentCmpName3.setObjectName("parentCompanyName")
                  self.parentCmpName3.setText("Parent Company Name* : ")
                  self.formLayout.setWidget(13, QFormLayout.LabelRole, self.parentCmpName3)
                  self.parentCmpName3LineEdit = QLineEdit(self.formLayoutWidget)
                  self.formLayout.setWidget(13, QFormLayout.FieldRole, self.parentCmpName3LineEdit)
          
                  self.childCmpName1 = QLabel(self.formLayoutWidget)
                  self.childCmpName1.setObjectName("childCompanyName")
                  self.childCmpName1.setText("Child Company Name* : ")
                  self.formLayout.setWidget(14, QFormLayout.LabelRole, self.childCmpName1)
                  self.childCmpName1LineEdit = QLineEdit(self.formLayoutWidget)
                  self.formLayout.setWidget(14, QFormLayout.FieldRole, self.childCmpName1LineEdit)
          
                  self.branchName = QLabel(self.formLayoutWidget)
                  self.branchName.setObjectName("branchName")
                  self.branchName.setText("Branch Name* : ")
                  self.formLayout.setWidget(15, QFormLayout.LabelRole, self.branchName)
                  self.branchNameLineEdit = QLineEdit(self.formLayoutWidget)
                  self.formLayout.setWidget(15, QFormLayout.FieldRole, self.branchNameLineEdit)
          

          i want to remove repeated Qlabels and QLine edits on different combobox selection. Kindly help me.

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #4

          @krsapril24
          Sorry, that's 100 lines of code. I don't which bit is wrong. You seem to be doing some removeWidget() and some creating of widgets, so what exactly is the problem?

          1 Reply Last reply
          0
          • K Offline
            K Offline
            krsapril24
            wrote on last edited by
            #5

            see if user select parent company i need to display only compnay name and if user select child company then i need to display parent company and child company.

            so if user select only one at a time no problem it is working. if user select first child comapny then i need to hide parent company name if exist and then i need to display parent company and child company. in this situation i am facing problem. because parent company does not exist when select child company. so i need to hide if exist only. Please help me. iam struggling in this last 3 days.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Hi and welcome to devnet,

              Where do you get the information about these companies from ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

              1 Reply Last reply
              0

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