Multiple Layers With The Canvas Tag?
Feb 13, 2011
I'm writing a script that graphs data in different colors and shapes and I'm encountering two problems:(1) I can't specify different colors for the graph I'm rendering. If I use fillStyle="red"; then the entire chart becomes red. It seems to use the last color specified as the color for everything on the chart.(2) The shapes are overlapping in strange ways. The fills are not covering the lines of shapes behind them so it's unclear which shape is in front and which is behind. It's like they aren't being treated as separate shapes but instead one shape where boundaries are unclear. I don't know how else to explain it.
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Oct 21, 2009
I'm having a problem with the <CANVAS> element in JavaScript. here's what i'm trying to do: I need 3 different canvas elements for writing a signature to. they must all 3 be visible at the same time
My problem that i'm having is that i can't seem to get the code to work which will write to more than one canvas.
[Code]...
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Feb 9, 2009
I'm not much of a programmer so I've difficulties getting the yellow windows at the following web address: [url] to drag and collapse correctly. Currently, the only window that works is the one with the red header. All the other windows should also be draggable and be allowed to close down.
So, basically I need to create the variable for this thing so that the nav windows work correctly. Problem is, everything I've tried has failed miserably to date.
code:
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Jul 23, 2005
I have a couple of layers that are hidden.
When an image is moused over, I want to show the appropriate layer,
then hide it on mouseOut.
The problem is, I get an error telling me "document.all[...].style is
not an object" for whatever layer I have created first. It seems as
though when the second layer is created, it overwrites the first one ....
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Sep 15, 2011
Its my first in this community and I hope someone can help me on this one. I�m currently working on the personalization of the layout of SAP ERP Portal. This Portal Framework uses Iframes to display the current page and/or applications on the Current Page.Here is a custom draw of a page
---- Custom Componentes Like Menus etc
----- Iframe (InnerPage) � Shows the Current Page
--------This Page can have embedded content and/or More Iframes with Applications
All the Iframes are on the same domain but I only have acess to the innerPage Code and not to the iframes that have the applications.Now we want the innerpage to automatic resize to the current content. This is being a problem (even after using jQuery Plugins or Resize Scripts) because:
1)The Iframes that have the applications change content height using Ajax/DHTML (not triggering load event) and this resize scripts wont call the resize mechanism.
2)I don�t have access to the applications source
3)On some tests ive made using Scripts ( for example Auto Height Jquery, SSI Dynamic Drive )some iframes display the same clientHeight and ScrollHeight Even if theres a scrollbar in the browser window.
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Jul 12, 2011
I want to delete some lines on the canvas that i have created in HTML5 (with the <canvas> tag). I know one solution and that is using clearRect() (give this function the HEIGHT and WIDTH of the canvas and you clears the whole canvas.).But i don't want to clear the whole canvas, i only want to delete a few lines made by the function lineTo().
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Mar 16, 2009
I have a menu in which is applied typeface script. Typeface 0.11 version doesn't support hover on links. There is an experimental version but doesn't work very well for me, so i tried to implement hover by myself.
Problem is: hover works pretty well changing canvas context property fillColor and then calling fill(), but the stroke on hovered voice remains on another color. Difficult to explain, so i put some test code online: TEST CODE As you can see, passing with mouse on the menu voices triggers the hover and the element change, but remains bordered in red.
[Code]...
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Jul 23, 2005
When viewed with Firefox. The show/hide function doesn't work as expected (evident when viewed). Anyone know why? Which bit is FF not liking and how can it be altered to be
cross browser friendly?
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Nov 9, 2011
Hey guys, im just learning how to use layers in css, and am trying to change a div like a targeted frame so that I can change content that is floating ontop of another image. So far I got that to work, except when I put in any embedded videos or image tags, then it stops working.[code]
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Jun 22, 2006
I am trying to catch keypresses in my canvas tag, but it appears that
that is not valid.
I may try to just create a hidden input box that will allow me to catch
keypresses.
I am trying to write a very simple asteroids game for a presentation on
Ajax in July, to show that javascript can do more than it was able to a
couple of years ago.
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Aug 16, 2010
I am working with the new canvas element. I have simplified my request.
Can I add a class to the canvas JS? Currently the fill colour is set with 'context.fillStyle="red";' I would love have this in a class as I want to change the colour of the fill with jQuery.
<!DOCTYPE html><html><head><meta charset=utf-8"><title>Canvas</title></head><body>
<canvas id="myCanvas"></canvas>
<script type="text/javascript">
var canvas=document.getElementById('myCanvas');
[Code]....
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Feb 23, 2010
Why doesn�t the following code work in IE, I use excanvas.js as told in other articles? excanvas is in the same dir as the html-file.
Code:
<html>
<head>
<title></title>[code].....
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Nov 3, 2011
Why won't my canvas graphics get rendered?
[Code]...
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Jan 1, 2011
I have make a javascript program that uses HTML canvas and I can't get it to work in Internet Explorer. I tried using excanvas and jqcanvas but had trouble getting them to work.
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Jul 23, 2005
Anyone know of any good beginners guide to layers online, preferably with
examples of form elements (initially populated from a database) updating the
parent page?
I have the basic functionality working with a popup window and
'opener.document.form1', but this doesn't look that good and I can't get it
to fill anything but a form element on the parent page.
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Oct 23, 2005
Where can I find some examples about javascript and the use of layers?
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Dec 9, 2005
I have a DIV that becomes visible when a link above it is moused over.
The DIV has links in it like so:
<div class="popup" onmouseout="hideLayer(this);">
<a class="popuplink" href="page1.html">Link 1</a><br/>
<a class="popuplink" href="page2.html">Link 2</a><br/>
<a class="popuplink" href="page3.html">Link 3</a><br/>
<a class="popuplink" href="page4.html">Link 4</a><br/>
</div>
When you mouse out of the div, it goes back into hidden. But as soon as I
touch any of the links, it hides, thinking I've left the DIV.
Now, I'm assuming this is a z-index layer issue, but I've tried every
combination of things I could think of to prevent the mouseout action when
mouseing over one of the links.
I tried setting div.popup's z-index higher than a.popuplink's, lower than
a.popuplinks, and the same as. (I did set each to a position as well.)
What am I missing?
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Jul 20, 2005
If the syntax for IE is:
document.getElementById(layerID)
What if I want to use layers ?
document.layers ?????????
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Aug 27, 2005
I made this script, always works but for some weird resion it just doesn`t work any more,
Does any one know why.
<script>
function layers( divID )
{
if (document.getElementById) { obj = document.getElementById(divID); }
else if (document.all) { obj = document.all[divID]; }
else if (document.layers) { obj = document.layers[divID]; }
return obj;
}
function show_layer ( divID )
{
var obj = layers ( divID );
obj.style.display == ''
}
show_layer ( 'test' );
</script>
<div id='test' style='display:none;'> this is a test layer </div>
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Apr 28, 2006
Does anyone know where i can find a tutorial on how to change the content of a layer like this: Writing to layers.
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Apr 7, 2009
Before the canvas tag you had to write a script to make a gradient for html element backgrounds. Now you can use canvas and it's as easy as ... well messing with canvas. I have this script. At one point I had the gradient img objects resizing so the gradient would not get skewed. it was simple. just set the height% at the opposite ratio of the canvas width/height. But I went to make some changes and the next thing i knew that no longer worked. I don't remember how I did it!! I'm going to have to start over if I can't figure it out. Here's the script. Canvas only.
I haven't adapted with excanvas for IE yet, but that's coming when I can figure out how I had the thing working right. It's a css issue. I had thought I put the img objects in divs that were sized and positioned and then set the images to width 100% height= 100%*((canvas.width-canvas.height)/canvas.width) So in my example, the canvas was 100 x 30 and the factor is 7 so it would resize the image 700% and the height would grow by the relative amount to the setting I had it. I'll try to figure it out, but there's the script working somewhat. I want to figure out a way to resize the img objects when the user resizes the page, but I want the img to always maintain aspect ratio. [URL]
<script>
/*ORIGINAL SCRIPT FOUND AT [URL]*/
window.onload = function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
var g = ctx.createLinearGradient(0, 0, 100, 50);
g.addColorStop(0, 'rgba(255, 255, 0, 0.5)');
g.addColorStop(0.5, '#0ff');
g.addColorStop(1, '#00f');
ctx.fillStyle = g;
ctx.fillRect(0, 0, 100, 50);
var data = canvas.toDataURL();
document.getElementById('i').src = data;
document.getElementById('EIMG').src = data;
var canvas2 = document.getElementById('c2');
var ctx2 = canvas2.getContext('2d');
var g2 = ctx2.createLinearGradient(0, 0, 100, 50);
g2.addColorStop(0, 'rgba(255, 0, 255, 0.5)');
g2.addColorStop(0.5, '#0ff');
g2.addColorStop(1, '#00f');
ctx2.fillStyle = g2;
ctx2.fillRect(0, 0, 100, 50);
var data2 = canvas2.toDataURL();
document.getElementById('i2').src = data2;
document.getElementById('DIMG').src = data2; .....
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Feb 25, 2010
Why doesn't the following code work:
<script type='text/javascript'>
var canvas = document.createElement('canvas');
canvas.width = 1400;
canvas.height = 700;
var context = canvas.getContext('2d');
context.strokeRect(10, 10, 50, 50);
context.stroke();
</script>
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Mar 21, 2010
I am trying to create an Asteroids type game using JavaScript along with html5's canvas element for drawing. I have searched around and have looked at examples but I can't figure out what is wrong with my rendering that I do in the game loop that is run every frame. The problem appears to be only that the canvas is not cleared at the beginning of each frame but I feel there might be something wrong also. The code used and shown below only works in Firefox but not Google Chrome or Safari.
[Code]...
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May 6, 2010
I'm new to Javascript, and having an issue with getInterval. For my programming languages class we have to create a simulation of waves breaking on a shore from above. I've decided to use a canvas object and Javascript for this animation, but am getting stuck on refreshing the frames.
Here is the code I have so far:
var shoreline = new Array();
var waves = new Array();
var canWidth = 600;
var canHeight = 400;
var waveNum = 0;
var count = 0; .....
As you can see, the idea is that each 5-pixel wide node of the shore and wave are stored in arrays so that the position of each node can differ. The wave() function initializes all the required data, and then calls setInterval on update(). The function update() draws the water, shore, and wave, and then updates the wave position node-by-node. Ideally, setInterval would cause this to happen repeatedly, so that the wave would appear to move closer to the shore every 1000ms.
However, this is not the case. It appears as though setInterval is working for one pass of update(), but fails after the first pass. You can tell that this is happening because the wave appears at its starting position, but does not continue to move. I read somewhere that setInterval can be broken by one-time functions, but I'm not sure. If you'd like to see what it's currently doing in a browser, I've hosted it here [URL]. Once I've got this animating properly I can continue my project, but I've hit a roadblock.
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Jun 19, 2011
Here's a snippet:
canvases[i] = document.createElement('canvas');
canvases[i].style.width = '3px';
canvases[i].style.height = '100%';
canvases[i].getContext("2D");
canvases[i].fillRect(1,0,1,table_height);
I'm trying to dynamically create a canvas element. Later in the script it gets attached to the DOM, and this works fine if the last two lines are missing. I end up with a canvas element that is 3px wide and 100% of the containing div tall. However, the last two lines make it crash, with the error report 'canvases[i].fillRect is not a function'.
If I change the last two lines to:
var drawing = canvases[i].getContext("2D");
drawing.fillRect(1,0,1,table_height);
It says 'drawing is null'. Something seems to be going wrong with the getContext bit, because setting the height and width work fine. It behaves the same if I append the canvas element to the DOM before trying to do the drawing as well. This is in FF4.0.1 with a xhtml1-strict.dtd doctype and valid html.
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Jul 12, 2011
The main one I find is to use translate to move the canvas around, which just seems odd to me. I don't even fully understand how it works. But the one I was looking at used clearRect. In examples given looked as though it had to redraw the canvas every frame. I'm just mucking around with a simple poker game, figured I'd have the table in one layer and anything that moves on a top layer? By doing that I could only clear each card as it moved around...yes?
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