In this section, we restrict the description to the first panel (Elements) of the developer tools. As shown in Figure 1.4, here are example of actions you will be able to perform: inspect the HTML structure of the page, debug JavaScript code as demonstrated in 10.6, inspect served files (static assets like CSS, JS, images), run performances audit 24, inspect websocket activity (section 11) and many more. The developer tools are a crucial way to work with websites, and particularly customize Shiny apps. Inline-block elements allow one to insert a block element in an inline.ġ.3.4.1 Visualizing the DOM with the developer tools.They cannot contain block tags for instance Hello World is not valid, but may contain other nested inline tags like (creates a clickable image pointing to a specific location). Inline elements (, ) are printed on the same line.All elements of a block are printed on top of each other. Block elements may contain other tags and take the full width (block or inline).We distinguish block and inline elements: Elements are displayed according to the flow layout model (Figure 1.2). Inside an HTML document, tag elements obey the box model, which briefly defines the element internal margins (padding), margins (space between multiple elements), the width and height. Formatting tags: to control some of the wrapped text properties like its size and font.Their role is to include external resources, provide interactivity with the user. Control tags: script, inputs and buttons (and more).Structure tags: they constitute the skeleton of the HTML page (, , ).Tags may be divided into three categories, based on their role: Guess what? This is exactly the purpose of this book! We must acknowledge it is still far from offering the same features as the original professional DJ gear, but it is a fairly good start!Īs you noticed, you will have to acquire a bit of HTML, CSS and JS knowledge to reach the same level of result. 36 lines of R code, including the wavesurfer htmlWidget package to display the waveform.2 png images (dj gear + rotating wheel).What is this magic? Under the hood, this Shiny app only consists of: The rotating part (central part of the jog wheel) indicates the read position and other useful information. Besides, the waveform is interactive, thereby allowing you to browse through the current track. Then click on the green play button to stop and start the music (the space key is also supported). Wait until the blue waveform appears on the player’s screen. # RUN # OSUICode::run_example( # "intro/dj-system", # package = "OSUICode" # ) Case study: Mobile development for Shiny. In this small example, I want to separate the different verticalLayout with rules but I don't know (depending on the width of the window) if they will be horizontally or vertically stacked inside the flowLayout. And if the window is not wide enough and some elements are vertically stacked, I would like to separate them with horizontal rules. If the elements are horizontally stacked, I would like to separate them with vertical rules. I would like to add horizontal and/or vertical rules (depending on the width of the window) between elements of a flowLayout in a Shiny app.
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