Show a Text over an Image at Mouse Location using jQuery

  • The code example here in this post explains how to show a text over an Image at mouse location using jQuery.
  • You can easily such as an image at the precise mouse location using jQuery.
  • You can either move the mouse over an image and get the location (coordinates) or click the mouse at any point on the image and get its coordinates.
  • I’ll show you can show a text or some message at the precise location of the mouse click on an image.
  • This is how you can get the coordinates or location of the mouse and place a text at the location.

The code example here in this post explains how to show a text over an Image at mouse location using jQuery.
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5 Projects to Help You Learn React

  • Variations of this UI can be found all over the web – Twitter, Facebook, Pinterest, Airbnb, Redfin, and so on – and it serves as a solid building block for the sort of app where you want to display an image + some data.
  • It’s also good practice for breaking down a UI into React components.
  • You might notice that the “days” look a lot like social cards…

    For added practice, here are a few ways you could expand on the app:

    You can see how this app starts off simple, but can be expanded at will to increase the challenge and the learning.

  • Hacker Hunt is an aggregator of Hacker News stories with categories, but more importantly, it’s a good app to build for React practice.
  • This app will give you some practice with lists of components that are a little more complicated than todos.

Here are 5 projects that’ll be fun to build, and do not involve any todo lists.
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Intro to React – Christopher Hague – Medium

Intro to React  #learning #react #javascript #programming #learningtocode #reactjs

  • Here is another representation of how we can conceptualize our component hierarchy:- Application – Search Bar – Product Table – Category – ProductThe Trickle Down EffectHow does our application use each of the components to interact with one another?
  • In the same way that functions rely on arguments to operate on and manipulate data, components rely on props that are given as a they being declared.Using the example from above, it becomes easier to conceptualize how the Product and Category components are rendering the appropriate information onto the screen.
  • When the Product Table component is declared within the Application component, the Application will pass down this information related to all of the products to the Product Table as props.
  • As such, the Search Bar component will inherit a set of functions that define how the products in the API will be filtered based on the user input.The Category and Product components will then rely on the props passed down from Product Table to render the list of items, using the Search Bar component to filter the products based on the search terms and render only those products to the screen.
  • Conversely, if the search bar is empty then each product in the collection will be rendered.Divide and ConquerNow that we have some idea of how we want each of our components to function, let’s sketch each of them out below to get some idea of how the code for the app might look:class Category extends React.Component { // renders categories}class Product extends React.Component { // renders products}class ProductTable extends React.Component { // declares a Category and Product component, passing props to each of them Category category={product.category} key={product.category} / Product product={product} key={} / // renders Category, Product}class SearchBar extends React.Component { // renders SearchBar // filters based on search terms}class Application extends React.Component { // renders SearchBar and ProductTable components, passing props to each of them SearchBar / ProductTable products={this.props.products} /}Now that we have all of our components defined, rendering the application to the screen becomes as simple as using the ReactDOM.render function and passing the Application component to it.ReactDOM.render( Application products={PRODUCTS} /,

React is a declarative, component-based JavaScript library used for building user interfaces. It was created by Facebook employee Jordan Walke and was first deployed on Facebook and Instagram in 2011…
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PhotoEditor SDK + React Native – imgly

PhotoEditor SDK + React Native  #ios #photoeditor #photoediting #android #reactjs #reactjs

  • However, react-native-navigation is not required for embedding the PESDK into your React Native application.Launching the PhotoEditor SDK from React NativeTo successfully launch our editor from React Native we needed to do three things:Add the PESDK library to our iOS project.Create a native module that bridges between React Native and the PhotoEditor SDK.Add a method to create a ToolbarController, push a PhotoEditController and present them from the current view controller.Call the method, wherever we want to edit an image in our React Native codeThe first step was rather easy.
  • In the classes implementation we registered our module with React Native by calling RCT_EXPORT_MODULE(PESDK):In order to create a new photo editor view controller we needed to create a new ToolbarController and push a PhotoEditController that loads a sample image.
  • All image fetching, scrolling, etc. is handled by React Native, so we only needed to handle the user’s taps on an image:We used react-native-fs to download a larger resolution image to the local filesystem, pass the path of the local file to our present() call and modify our iOS native module:We then had a nice little app, that shows a grid of images, loads a high-resolution image upon selection and opens the PhotoEditor SDK:The iOS demo app running on a device.Android implementationAs we have seen, opening the PESDK from React Native can easily be done on iOS.
  • To accomplish this we needed to repeat some of the previous steps for Android:Add the PESDK to our Android project.Create a native module that bridges between React Native and the PESDK.Add a method to launch an ImglyIntent using the PhotoEditorBuilder from the current Activity.Installing the SDK is again done by following the instructions for integrating the PESDK and shouldn’t take more than a few minutes.
  • Creating a native module on Android is quite similar to iOS, although a little more setup code is required: We created our PESDKModule that recreates the present(path) method from iOS, a PESDKPackage containing our module and finally added the package to our Application:This time, we prepared the desired settings for our editor, added our image path and passed everything to a PhotoEditorBuilder.

Often our users ask whether it’s possible to use the PhotoEditor SDK for iOS and Android with React Native (the good news right away: Yes, it is possible and fairly easy as well). So, we set out to…
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Pixel perfect cloud images in React Native – uncommon

Pixel perfect cloud images in React Native:  #ReactJS #JavaScript

  • It could simply define itself with a flex, like belowImage style={{flex: 1, backgroundColor: ‘red’}} resizeMode={‘cover’} source={{uri: /You could use Image component’s resize mode techniques to achieve the desired effect.Issue here is that you have not optimized image for exact screen resolution of the device.To do that, you need to generate a cloud url that includes dimensions of the image, which, is known only at runtime when Image layout is measured.
  • So you end up providing onLayout function to Image component, get those dimensions, generate a url and then finally re-render Image component with probably a state change in the parent component.You need to go through the same chore every time you would like to fetch an image from cloud service.
  • I will be using Cloudinary as image service provider, but the concept can be extended to any other cloud image service.CLImage component needs to track image width, image height.
  • Here is the snippet for renderImagerenderImage() { let opts = {} Object.assign(opts, this.props.options,{ width: this.state.imageWidth, height: this.state.imageHeight })return ( Image style={{ width: this.state.imageWidth, height: this.state.imageHeight }} source={{ uri: opts) }}/ )}And finally the placeholderrenderFreeForm() { return ( View style={[, styles.background]} onLayout= {(event) = / )}Since React Native deals with device independent pixels, it is important to use PixelRatio to determine actual pixel size of the image.
  • This is how imageUrl function is going to look likeimageUrl(cloudId, options={}) { let opts = {} Object.assign(opts, {crop: “fill”, gravity: “face”, format: “jpg”, quality: 75, secure: true}, options) opts.width = opts.height = let url = cloudinary.url(cloudId, opts) console.log(“Image url is:” + url) return url}with CLImage component built, now I can use it to render cloud images with out explicitly specifying width/height, see belowView style={styles.mainContainer} CLImage cloudId={“sample_1”} / View CLImage cloudId={“sample_3”} / CLImage cloudId={“sample_4”} / CLImage cloudId={“sample_2”} / View CLImage cloudId={“sample_6”} / CLImage cloudId={“sample_5”} //ViewStyles for the sameconst styles = StyleSheet.create({ mainContainer: { flex: 5 }, flexOneContainer: { flex: 1 }, portraitContainer: { flex: 2, flexDirection: ‘row’}})You would have noticed that we have not given any information on width and height of the image.

Mobile devices come in multiple screen resolutions. When we display images it is important to ensure that the images displayed are optimized for screen resolution. This will ensure that images will…
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Image Pipeline with React Native ListView – William Candillon – Medium

Image Pipeline with React Native ListView @wcandillon  #ReactNative #JavaScript #Reactjs

  • In this story, I would like to share how ListView can be used to optimize image processing when scrolling through images.Consider a list of entries like an Instagram feed.
  • Finally, when the entry goes outside the viewport, and if the image hasn’t been cached yet, we would like to cancel the request to the image URI in order to prioritize requests for the visible entries.In the example below, we fetch entries from a firebase backend by pages of ten.
  • When we reach the end of the list, we fetch a new page by using the onEndReached event.Now we can use onChangeVisibleRows() to only mount images when they are visible.
  • In onChangeVisibleRows(), we update the visible property for each row that becomes visible or invisible.In the Row component, we can use the visible property to mount/unmount the image according to its visibility.
  • We use the react-native-img-cache package for this.In the last step, we cancel the HTTP request to download the image if the row becomes invisible.

In mobile apps, scrolling through a list of images is a very common use case for which users have high expectations. In a previous story, I shared formulas that I used in order to cache images with…
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Resize local images with React Native

  • You can use an image from the camera roll or a base64 encoded image.
  • For example, base64 support for images or updates to support latest React Native versions were done by the community.
  • To resize local image files, we created react-native-image-resizer .
  • Our package helps you with this situation by allowing image resizing directly from React Native.
  • Whenever your app requires the user to take a picture with the camera , or from the camera roll, the image is so heavy that it takes ages to upload it on the server.

Rescale local image files in your React Native app, to reduce their size and upload them to a server.
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Introducing Marketplace: Buy and Sell with Your Local Community

  • Marketplace opens with photos of items that people near you have listed for sale.
  • Selling an item in Marketplace is just as easy as browsing for one.
  • Facebook does not facilitate the payment or delivery of items in Marketplace.
  • To help people make more of these connections, today we’re introducing Marketplace, a convenient destination to discover, buy and sell items with people in your community.
  • There, you can view your saved items, products you’ve posted for sale, and all your messages with people.

Facebook is where people connect, and in recent years more people have been using Facebook to connect in another way: buying and selling with each other. This activity started in Facebook Groups and has grown substantially. More than 450 million people visit buy and sell groups each month — from families in a local neighborhood to collectors around the world.
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First weeks in Elm

First weeks in #Elm, good feedback by @ajrob27 🤔 💡 #reactjs #elixir #programming

  • If you need to edit styles with Elm then do so, but make sure you document and comment your code .
  • Elm has gained some serious attention in the Elixir community.
  • Elm shines as a replacement for JavaScript.
  • One thing is for certain: Elm can replace JavaScript.
  • For HTML, I would still use Elm over Slim.

Elm has gained some serious attention in the Elixir community. At Erlang Factory SF 2016, Chris McCord shared his Phoenix talk with Elm’s…
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First weeks in Elm — Red Shift

First weeks in #Elm, good feedback by @ajrob27 🤔 💡 #reactjs #elixir #programming

  • If you need to edit styles with Elm then do so, but make sure you document and comment your code .
  • Elm has gained some serious attention in the Elixir community.
  • Elm shines as a replacement for JavaScript.
  • One thing is for certain: Elm can replace JavaScript.
  • For HTML, I would still use Elm over Slim.

Read the full article, click here.

@OpenCoconut: “First weeks in #Elm, good feedback by @ajrob27 🤔 💡 #reactjs #elixir #programming”

Elm has gained some serious attention in the Elixir community. At Erlang Factory SF 2016, Chris McCord shared his Phoenix talk with Elm’s…

First weeks in Elm — Red Shift