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- With @react-native-community/hooks you can use the useAppState hook to check the app state. When you close the app, it gets a state of unknown once you open it back. When is in background, it says background' or 'inactive'. So when it's unknown` you know the app is opening from being closed, not minimized or in the background.
In React, the onClick handler allows you to call a function and perform an action when an element is clicked. onClick is the cornerstone of any React app.
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Click on any of the examples below to see code snippets and common uses:
If you’re new to React, I suggest you read our excellent beginner tutorial: Build a Todo App in React Using Hooks
What is the React onClick Event Handler?
Whenever you need to perform an action after clicking a button, link, or pretty much any element, you’ll use the onClick event handler.
Therefore, the onClick event handler is one of the most powerful and most used tools in your React tool belt.
Let’s look at some examples of how we can use the onClick event handler in React.
Example: Call a Function After Clicking a Button
The simple App component above has one function called sayHello(), and a single button.
The button inside the React component has an onClick event handler attached to it, pointing to our sayHello() function. Doing so will trigger the function every time you click the button.
How do we trigger the sayHello() function? By passing in the name of the function you want to call inside the curly braces, after the event handler:
Common Mistakes
Notice how we only pass the name of the function to the event handler and not the name followed by parentheses. Parentheses after a function name executes the function.
In other words, if we passed in the function with parentheses, the function will execute every time the component renders.
We do not want to execute a function inside of the event handler.
✅ Good
❌ Bad
Example: Call an Inline Function in an onClick Event Handler
An inline function is a function which is defined inside of the onClick handler when the React Component renders.
It’s created on render because the function definition is inside of the onClick handler, which is inside of the component render method (or return, in the case of functional React components).
You’d use an inline function to pass in additional arguments to a function, such as a value from a loop, or the target button’s value. Let’s take a look at an example:
Common Mistakes
A common mistake when using inline functions is not including parentheses after the function name.
Unlike calling a function that’s not inline, one that’s defined inside of the component’s body, we need to execute the function if it’s inline.
✅ Good
❌ Bad
Example: Call Multiple Functions in an onClick Event Handler
You may find yourself wanting to call multiple functions after clicking a button. For example, updating a component’s state and simultaneously showing an alert.
There are multiple ways to do this:
- Running a block of code inside the onClick handler
- Calling multiple functions inside the onClick handler
Let’s start with defining a block of code inside of the onClick handler itself:
As the example above shows, it is possible to define a block of code inside of the onClick handler. However, depending on the amount of code that you want to run, the block scope can be difficult to read.
Similarly, calling multiple functions inside of the onClick handler is also possible:
Again, the code above is not as readable as it could be if we just called the sayHello function and set the state inside of that. However, there may be instances when you need to do the above.
Example: Updating the State in an onClick Event Handler
A very common use of an inline function inside of an onClick event handler in React is to update a component’s state.
You’ll do this when you want to update the state with the button’s value, or using a value from a loop, for example. Let’s take a look at how we can update the state inside of an onClick event handler:
Continue learning about updating state in React components through the onClick event handler in Simplifying React State and the useState Hook.
Example: Pass a Button Value to an Inline Function
Another common use of an inline function is to pass in a button’s value as an argument. This is also very common when using input elements and the onChange event handler.
Take a look at the example below. Notice the value e that’s returned from the onClick event handler:
The value e is what’s called a SyntheticEvent. Every event handler is passed a SyntheticEvent, which is an object that contains useful metadata related to the event, such as the target element’s value.
The code above accesses just that, the target element’s value, and shows it inside a browser alert. The e.target.value is originating from the value attribute that’s on the actual button element.
Take some time to explore the SyntheticEvent further as there are more useful values inside of it. You could start by console logging e out and clicking through the object.
Example: Pass a Value from an Array to an Inline Function
The final example we’ll explore is how to pass in a value from an array to an inline function that’s inside of the onClick event handler.
One common use of arrays in React is to render multiple components per item in the array.
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For example, an admin dashboard which displays a list of users and provides admins with the ability to edit or delete users:
The code above first defines a new array called users with a list of first names. Then, it loops through those names, rendering a list and button element for each value inside the array.
Finally, it passes in the name from the array as an argument of the deleteUserWithName function.
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(Flickr)
Finding a great sex app can be tough. When people search for “sex apps,” they aren’t always looking for the same thing. Some people are hunting for an app that will help them find people to hook up with. Other are looking for an app with general info about sex. Still others are looking for apps that can give them secret sex tips so they can be outstanding in the bedroom. Thankfully, we’ve made it easy to find the apps that are the most useful. These are the best sex apps for Android and iPhone users.
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1. DOWN iPhone Android
(DOWN)
DOWN, formerly known under the name Bang With Friends, started life as a hook-up app. These days, it has broadened the app’s focus to include dating, as well as casual flings.
You can search through pictures of your friends (and your friends’ friends), and decide if you want to GET DOWN (hook up) or GET DATE (have a relationship). There are over 1 million people using this app, and DOWN also hosts exclusive hook-up parties that you can learn more about from within the app. Whether you are looking for men or women, this app can help you get laid.
2. Cosmopolitan’s Sex Position of the Day iPhone Android
(Cosmopolitan)
If you want to spice up your sex life, Cosmo’s guide to new and exciting sex positions can introduce something fresh into your relationship. There are images and written instructions that explain how to get into each position, along with a “carnal challenge” rating system to help you find the most tricky positions. This is great for people who like positions that are a bit more athletic.
This app will appeal to singles, as well as to people who are in a committed, long-term relationship. You can also send the app as a gift to another person, right from within the app. This is a subtle way to hint to your partner that you want to try something new in the bedroom.
Check out the video from Cosmo below, which shows off some of these sex positions.
If you love this app, you might also want to check out Cosmo’s Little Big Book of Sex Games.
3. Love Sparks iPhone Android
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(Love Sparks)
Turning your sex life into a to-do list may not sound sexy, but sharing a bulleted list of your desired positions and scenarios can make things pretty steamy. Love Sparks gamifies your sex life, offering unlockable achievements and tons of Kama Sutra-inspired positions. If gamification has upped your fitness levels, imagine what it can do for your relationship.
In addition, Love Sparks offers ideas for quickie encounters, fun locations, role playing fantasy scenarios, and much more. You can choose positions by complexity, intimacy, or strength. Best of all, you can password-protect the app to keep your intimate details totally private. Security is the new sexy.
4. Sexulator iPhone Android
Check out the video above to hear what some morning show hosts have to say about this app.
Sexulator is basically a calendar for tracking your sex life. This app will appeal to singles who want to track their conquests in the event of illness or pregnancy, as well as married couples who are trying to conceive (or just make sure they aren’t letting the fire die out.) Sexulator has a discreet app icon, and lets you track whether you had full sex, oral sex, a steamy make out session, or even a session with multiple partners. Whether you’re single, dating, married, or getting out of a relationship, this app will appeal to you.
5. Pure iPhone Android
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(Pure)
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Currently available on iPhone and coming soon to Android, Pure is an app that lets you meet someone to hook up with, and do it fast. You can arrange for a one-hour meet up with someone for a date or for no-strings attached fun.
Requests and photos are only visible to those with matching search criteria. The request, with the history of conversation and photos, will be automatically deleted within an hour. Mashable reports that this cool app is similar to “Craigslist’s casual encounter channel; a hook-up tool that lets you browse who’s around and what they want.”
Pure is 100% free to use until January 2015. It’s not clear how much it will cost after that date. You can learn more about Pure and other apps like it from this cool article on Jezebel.
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Want more sex tips and advice? Check out the classic book The Joy of Sex.