Reset all Numeric TextBox values inside listview

Question

Hi there how I can take the sum of Numeric TextBox values and reset Numeric TextBox values inside listview when click button ?here is screenshot from mylist . when click save button if the sum of Numeric TextBoxs values are bigger or less than total price then reset all Numeric TextBox value to 0 here is my xaml: and this the code : private void listView_ItemTapped(object sender, Syncfusion.ListView.XForms.ItemTappedEventArgs e) { var pay = e.ItemData as PayMethod; if (pay.PayValue > Totalval) { Application.Current.MainPage.DisplayAlert("Error ! " , "pay.PayValue bigger than Total re-enter correct value less than or equal total value" , "OK"); } else { Application.Current.MainPage.DisplayAlert("Pay $", "Pay Method : "+ pay.PayName + " Pay Value = "+pay.PayValue+ " Total = "+Totalval, "OK"); } } private void SfButton_Clicked(object sender, EventArgs e) { if (val>Totalval) { Application.Current.MainPage.DisplayAlert("Pay $", "The amount paid is greater than the total requested."+" Req = "+Totalval +" SR"+" Amount paid = "+val+" SR"+" Enter a valid value", "OK"); } else if(val

Lakshmi Natarajan · Answer

Hi Etawreed, 
 
Thank you for using Syncfusion products. 
 
We have checked the reported query “Reset all Numeric TextBox values inside listview” from our side. We would like to inform you that you update the ListViewItem values at run time. In this case, you can get all the items data from the SfListView.DataSource.DisplayItems and reset the value.  
 
Please refer to the following code snippets for more reference, 
 
Get the items from the DisplayItems and reset the values. 





private void SfButton_Clicked(object sender, EventArgs e) 
{ 
    if (val > Totalval) 
    { 
        Application.Current.MainPage.DisplayAlert("Pay $", "The amount paid is greater than the total requested." + " Req = " + Totalval + " SR" + " Amount paid = " + val + " SR" + " Enter a valid value", "OK"); 
        ResetPayValue(); 
    } 
    else if (val < Totalval) 
    { 
        Application.Current.MainPage.DisplayAlert("Pay $", "The amount paid is less than the total requested." + " Req = " + Totalval + " SR" + " Amount paid = " + val + " SR" + " Enter a valid value", "OK"); 
        ResetPayValue(); 
    } 
    else 
    { 
        Application.Current.MainPage.DisplayAlert("Pay $", "Payment completed successfully", "OK"); 
        CloseAllPopup(); 
        CartPage cartPage = new CartPage(); 
        App.Current.MainPage = cartPage; 
    } 
} 
... 
 
private void ResetPayValue() 
{ 
    var items = listView.DataSource.DisplayItems; 
 
    foreach(Contacts item in items) 
    { 
        item.PayValue = 0; 
    } 
}  
 
Note: You need to implement the INotifyPropertyChanged interface and invoke the PropertyChanged event for the Property to update the runtime changes in the UI. 
 
Please refer to the following code snippets for more reference, 





public class Products : INotifyPropertyChanged 
{ 
    ... 
 
    public double PayValue 
    { 
        get { return payValue; } 
        set 
        { 
            if (payValue != value) 
            { 
                payValue = value; 
                this.RaisedOnPropertyChanged("PayValue"); 
            } 
        } 
    } 
 
    public event PropertyChangedEventHandler PropertyChanged; 
 
    public void RaisedOnPropertyChanged(string _PropertyName) 
    { 
        if (PropertyChanged != null) 
        { 
            PropertyChanged(this, new PropertyChangedEventArgs(_PropertyName)); 
        } 
    } 
}  
 
 
Please refer to the following documentation regarding the same, 
https://docs.microsoft.com/en-us/xamarin/xamarin-forms/xaml/xaml-basics/data-bindings-to-mvvm#a-simple-viewmodel 
 
Also, refer to our user guidance document regarding the same, 
UG link: https://help.syncfusion.com/xamarin/listview/getting-started#creating-data-model-for-the-sflistview 
KB link: https://www.syncfusion.com/kb/11286/how-to-edit-the-listview-tapped-item-in-xamarin-forms-sflistview-using-dataform 
 
Please let us know if you need further assistance. 
 
Regards, 
Lakshmi Natarajan