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Found 2 results

  1. I have spent many hours (over many days) trying to find out how to align a <script></script> within HTML5 specifically one that creates a canvas using . There is a page referring to centering images... https://www.w3schools.com/howto/howto_css_image_center.asp useless! There is a page referring to CSS Layout.... https://www.w3schools.com/css/css_align.asp useless! And heres another one on Canvas reference.... https://www.w3schools.com/tags/ref_canvas.asp useless! https://www.w3schools.com/tags/tag_canvas.asp useless! https://www.w3schools.com/tags/tag_script.asp useless! https://www.w3schools.com/html/html5_canvas.asp also useless! This is so basic a feature you would think that there would be examples of this in some of your examples. but no! Here is the code I have been trying to center.....as you can see I have tried quite a few different methods. <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <style> canvas { border:1px solid #d3d3d3; background-color: #f1f1f1; margin: auto; text-align: center; object-position:center } .center { display: block; margin-left: auto; margin-right: auto; width: 50%; } </style> </head> <body onload="startGame()"> <div class="center"> <script> var myGamePiece; function startGame() { myGamePiece = new component(30, 30, "red", 10, 120); myGameArea.start(); } var myGameArea = { canvas : document.createElement("canvas"), start : function() { this.canvas.width = 800; this.canvas.height = 600; this.canvas.x = 100; this.canvas.y = 50; this.canvas.style.cursor = "none"; //hide the original cursor this.context = this.canvas.getContext("2d"); document.body.insertBefore(this.canvas, document.body.childNodes[0]); this.interval = setInterval(updateGameArea, 20); window.addEventListener('mousemove', function (e) { myGameArea.x = e.pageX; myGameArea.y = e.pageY; }) }, clear : function(){ this.context.clearRect(0, 0, this.canvas.width, this.canvas.height); } } function component(width, height, color, x, y) { this.width = width; this.height = height; this.speedX = 0; this.speedY = 0; this.x = x; this.y = y; this.update = function() { ctx = myGameArea.context; ctx.fillStyle = color; ctx.fillRect(this.x, this.y, this.width, this.height); } } function updateGameArea() { myGameArea.clear(); if (myGameArea.x && myGameArea.y) { myGamePiece.x = myGameArea.x; myGamePiece.y = myGameArea.y; } myGamePiece.update(); } </script> </div> <p>Move the cursor inside the canvas to move the red square.</p> </body> </html> Please can you place more references to alignment as this issue has become somewhat annoying considering how easy this is in p5 javascript for instance. In p5 its - var canvas = createCanvas(1000, 350); canvas.position(x,y); So please make some kind of reference to centering js and <script> in some of the other pages using the term center, like <center> (yes I know its deprecated - but what are the alternatives?) as the search for this info is rather long. Thankyou in advance.
  2. In the beginning of the JavaScript tutorial, there are several examples of working with JavaScript that don't include any script tags. I was able to duplicate the examples with my own text editor and browser, also. However, later in the tutorial it is stated "In HTML, JavaScript code must be inserted between <script> and </script> tags." It is a bit confusing, and I am wondering why the script tags weren't needed in the first few examples, such as the one below: <!DOCTYPE html> <html> <body> <h1>What Can JavaScript Do?</h1> <p id="demo">JavaScript can change HTML content.</p> <button type="button" onclick="document.getElementById('demo').innerHTML = 'Hello JavaScript!'">Click Me!</button> </body> </html> Which runs fine without the script tags. I was able to duplicate it with my own text editor and browser. Thanks in advance for any help offered! patricia
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