state

I have been trying to create a 3 column drop-down list as Country, State, City. The list of state will be shown based on which country is selected. and the same thing happens to city depends on which State is selected. My database is as follow. If a country is selected, then states will show depending on country. Same thing happens to City A member will select his country,state, and city from an already existed Country, State, City databases from django.db import models class Member(models.Model): residing_country = models.CharField(max_length=50) residing_state = models.CharField(max_length

I'm trying to implement a piece of code I found to store the state of a CheckBox that is in a ListView but it didn't worked. Does anyone have any idea why my code from my adapter isn't working? package kevin.erica.box; import java.util.ArrayList; import kevin.erica.box.R; import android.R.color; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.CheckBox; import android.widget.ImageView; import android.widget.TextView;

I have the following function for walking around "edges" of the "graph" of my game world. It alters the state of the world--specifically, the player's location. I need to report a message alerting the player of their change in location as well. So I could either return a tuple of (message, newWorld), or I could use a State monad. (Right? I'm new to this stuff.) Here's my attempt at the monad approach: walk dir = do world <- get let attempt = filter (\e -> edgeDirection e == dir) $ edges edges = (worldEdges world) M.! playerLoc playerLoc = playerLocation $ worldPlayer world case attempt of [] -

I wrote some haskell code to toggle a pin on the raspberry pi depending on an interrupt I get from another pin on the raspberry pi. I simply do not know how to toggle the state of the pin without knowing the previous toggle state. The program itself is very simple. import Control.Concurrent import Data.IORef import HasberryPi main = do wiringPiSetup pinMode 0 output pinMode 7 input pullUpDnControl 7 pull_down wiringPiISR 7 edge_both onoff threadDelay (15*(10^6)) onoff s = do a <- readIORef s -- This is wrong digitalWrite 0 (if b then pinhigh else pinlow) -- This is wrong So basically what

When I'm sending state of the child component to its parent component, React is sending old state to the parent component. I want to send the updated state on every click on ListItem which is properly working and calling the function handleItemClick. But when I'm calling sendStateToParent . It is passing old state of it. Suppose I have clicked on ITEM1 , it is sending empty array [] . Next I have clicked on ITEM2 , it is sending array [ITEM1] . Here I'm actually creating a multiselect dropdown. which also can act as single select based on props it is getting. import React from 'react'; import

I am writing an application which needs a connected location client in all the activities. How do the manage the state of the client? I want to call the mLocationClient.connect() only once to avoid hassle, and should be able to remove location updates / disconnect when the application stops. How do I keep the location client connected across all activities, assuming I have connected to it in the splash screen Activity ? Another question that arises here is, when I resume the paused application (not recreation), the app won't start with the splash screen. How do I maintain the connection in