![]() The downside of having an embedded app using the virtual DOM on a webpage is that it doesn’t have direct access to the Window object. At carwow we use Elm when we need state management in parts of the website with high client-side interactivity. ![]() Being able to use a UI pattern just by adding a custom HTML element on a page and not having to worry about invoking any JS code manually is pretty neat.Īn event stronger argument in favour of web components was how they interact with the virtual DOM. Web components were a great candidate to build tooltips for their ease of use as part of a design systems. I don’t expect that situation to be problematic enough to introduce more JS code to resolve it programmatically. Users can still adjust it by scrolling down the page, so the content can be viewed. The only remaining situation where the tooltip could go off-screen is if the element is located at the bottom of the page when the user taps on it. In a situation where the label is placed at the left or right end of the screen, the tooltip’s dropdown will be fixed to the side of the website’s grid. ![]() That switches the display property of the dropdown to block and trigger a CSS animation for a swift fade-in effect. To open the tooltip, we use a class with a modifier (following BEM) tooltip-open. The idea is to set the container with position: relative while the dropdown has a position: absolute and we can use a combination of left: 50% and transform: translateX(-50%) to have the tooltip at the horizontal centre of the label. The CSS needed for this approach is minimal. If you do need to support legacy browsers such as Internet Explorer, don’t be scared by its lack of support for the media feature, you can use Browserhacks to specifically target certain browsers your audience rely on. Other devices will rely on JS and touch events instead. To make things easier, I chose to use a CSS media feature so that only devices that support hovering elements will handle opening/closing tooltips via CSS. Handling CSS hover events on touchscreens can be tricky as browsers will interpret them differently. The drawback with this approach is that we need a different behaviour on touch screens, where users would expect to be able to dismiss a tooltip either by tapping the label a second time or by tapping away anywhere on the screen. We can easily build a tooltip for desktop screens using the :hover pseudo-class. if(!window.My initial idea is to take advantage of CSS as much as possible. These work in exactly the same way as screenX/ screenY.Īlso in the code we include a snippet that detects whether screenLeft is supported, and if not, polyfills in screenLeft/ screenTop using screenX/ screenY. Window.requestAnimationFrame(positionElem) PElem.textContent = 'Window.screenLeft: ' + window.screenLeft + ', Window.screenTop: ' + window.screenTop ![]() Let newTop = window.screenTop + canvasElem.offsetTop Ĭtx.arc(leftUpdate + (width/2), topUpdate + (height/2) + 35, 50, degToRad(0), degToRad(360), false) Let newLeft = window.screenLeft + canvasElem.offsetLeft ![]() InitialTop = window.screenTop + canvasElem.offsetTop initialLeft = window.screenLeft + canvasElem.offsetLeft In this example we are using Window.screenLeft/ Window.screenTop plus Window.requestAnimationFrame() to constantly redraw the circle in the same physical position on the screen, even if the window position is moved. In our screenleft-screentop example, you'll see a canvas onto which has been drawn a circle. Syntax leftWindowPos = window.screenXĪ number equal to the number of CSS pixels from the left edge of the browser viewport to the left edge of the screen. This was originally supported only in IE but was introduced everywhere due to popularity. Note: An alias of screenX was implemented across modern browsers in more recent times - Window.screenLeft. ![]()
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