[jQuery] Re: SOLVED Re: [jQuery] Re: how would you initialize google excanvas on a new piece of html?
original package at http://excanvas.sourceforge.net/
[jQuery] Re: SOLVED Re: [jQuery] Re: how would you initialize google excanvas on a new piece of html?
sry forgot to add that the solution in this modification is to call googleExCanvas(), _without_ specifying a dom node to traverse. I ran into problems if i tried to init a single dom node.. but the code checks if a canvas tag has been initialized already, so there's no overhead to speak of.. Rene Veerman wrote: Solution: // Copyright 2006 Google Inc. //tiny fix by Veerman Internet Services to allow initialization on HTML loaded after document.ready // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Known Issues: // // * Patterns are not implemented. // * Radial gradient are not implemented. The VML version of these look very // different from the canvas one. // * Clipping paths are not implemented. // * Coordsize. The width and height attribute have higher priority than the // width and height style values which isn't correct. // * Painting mode isn't implemented. // * Canvas width/height should is using content-box by default. IE in // Quirks mode will draw the canvas using border-box. Either change your // doctype to HTML5 // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype) // or use Box Sizing Behavior from WebFX // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html) // * Optimize. There is always room for speed improvements. // only add this code if we do not already have a canvas implementation if (!window.CanvasRenderingContext2D) { var googleExCanvas = function(){ // alias some functions to make (compiled) code shorter var m = Math; var mr = m.round; var ms = m.sin; var mc = m.cos; // this is used for sub pixel precision var Z = 10; var Z2 = Z / 2; var G_vmlCanvasManager_ = { init: function(opt_doc){ var doc = opt_doc || document; if (/MSIE/.test(navigator.userAgent) && !window.opera) { var self = this; //doc.attachEvent("onreadystatechange", function(){ self.init_(doc); //}); } }, init_: function(doc){ if (doc.readyState == "complete") { // create xmlns if (!doc.namespaces["g_vml_"]) { doc.namespaces.add("g_vml_", "urn:schemas-microsoft-com:vml"); } // setup default css var ss = doc.createStyleSheet(); ss.cssText = "canvas{display:inline-block;overflow:hidden;" + // default size is 300x150 in Gecko and Opera "text-align:left;width:300px;height:150px}" + "g_vml_\\:*{behavior:url(#default#VML)}"; // find all canvas elements var els = doc.getElementsByTagName("canvas"); for (var i = 0; i < els.length; i++) { if (!els[i].getContext) { this.initElement(els[i]); } } } }, fixElement_: function(el){ // in IE before version 5.5 we would need to add HTML: to the tag name // but we do not care about IE before version 6 var outerHTML = el.outerHTML; var newEl = el.ownerDocument.createElement(outerHTML); // if the tag is still open IE has created the children as siblings and // it has also created a tag with the name "/FOO" if (outerHTML.slice(-2) != "/>") { var tagName = "/" + el.tagName; var ns; // remove content while ((ns = el.nextSibling) && ns.tagName != tagName) { ns.removeNode(); } // remove the incorrect closing tag if (ns) { ns.removeNode(); } } el.parentNode.replaceChild(newEl, el); return newEl; }, /** * Public initializes a canvas element so that it can be used as canvas * element from now on. This is called automatically before the page is * loaded but if you are creating elements using createElement you need to * make sure this is called on the element. * @param {HTMLElement} el The canvas element to initialize. * @return {HTMLElement} the element that was created. */ initElement: function(el){ el = this.fixElement_(el); el.getContext = function(){
[jQuery] SOLVED Re: [jQuery] Re: how would you initialize google excanvas on a new piece of html?
Solution: // Copyright 2006 Google Inc. //tiny fix by Veerman Internet Services to allow initialization on HTML loaded after document.ready // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Known Issues: // // * Patterns are not implemented. // * Radial gradient are not implemented. The VML version of these look very // different from the canvas one. // * Clipping paths are not implemented. // * Coordsize. The width and height attribute have higher priority than the // width and height style values which isn't correct. // * Painting mode isn't implemented. // * Canvas width/height should is using content-box by default. IE in // Quirks mode will draw the canvas using border-box. Either change your // doctype to HTML5 // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype) // or use Box Sizing Behavior from WebFX // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html) // * Optimize. There is always room for speed improvements. // only add this code if we do not already have a canvas implementation if (!window.CanvasRenderingContext2D) { var googleExCanvas = function(){ // alias some functions to make (compiled) code shorter var m = Math; var mr = m.round; var ms = m.sin; var mc = m.cos; // this is used for sub pixel precision var Z = 10; var Z2 = Z / 2; var G_vmlCanvasManager_ = { init: function(opt_doc){ var doc = opt_doc || document; if (/MSIE/.test(navigator.userAgent) && !window.opera) { var self = this; //doc.attachEvent("onreadystatechange", function(){ self.init_(doc); //}); } }, init_: function(doc){ if (doc.readyState == "complete") { // create xmlns if (!doc.namespaces["g_vml_"]) { doc.namespaces.add("g_vml_", "urn:schemas-microsoft-com:vml"); } // setup default css var ss = doc.createStyleSheet(); ss.cssText = "canvas{display:inline-block;overflow:hidden;" + // default size is 300x150 in Gecko and Opera "text-align:left;width:300px;height:150px}" + "g_vml_\\:*{behavior:url(#default#VML)}"; // find all canvas elements var els = doc.getElementsByTagName("canvas"); for (var i = 0; i < els.length; i++) { if (!els[i].getContext) { this.initElement(els[i]); } } } }, fixElement_: function(el){ // in IE before version 5.5 we would need to add HTML: to the tag name // but we do not care about IE before version 6 var outerHTML = el.outerHTML; var newEl = el.ownerDocument.createElement(outerHTML); // if the tag is still open IE has created the children as siblings and // it has also created a tag with the name "/FOO" if (outerHTML.slice(-2) != "/>") { var tagName = "/" + el.tagName; var ns; // remove content while ((ns = el.nextSibling) && ns.tagName != tagName) { ns.removeNode(); } // remove the incorrect closing tag if (ns) { ns.removeNode(); } } el.parentNode.replaceChild(newEl, el); return newEl; }, /** * Public initializes a canvas element so that it can be used as canvas * element from now on. This is called automatically before the page is * loaded but if you are creating elements using createElement you need to * make sure this is called on the element. * @param {HTMLElement} el The canvas element to initialize. * @return {HTMLElement} the element that was created. */ initElement: function(el){ el = this.fixElement_(el); el.getContext = function(){ if (this.context_) { return this.context_; } return this.context_ = new CanvasRenderingContext2D_(this); }; // do not use inline function because that will leak memory el.attachEvent('onpropertychange', onPropertyChange);
[jQuery] Re: how would you initialize google excanvas on a new piece of html?
i tried G_vmlCanvasManager_.init(__self.html); but that didnt work.. probably because this thing runs inside an anon function, right? Rene Veerman wrote: Hi. I'm trying to use google's excanvas in my CMS, but ran into a snag; excanvas initializes all canvas tags in the dom on startup. my cms loads much html dynamically, and i need to initialize excanvas on those new dom nodes. the new dom node i'm trying to init is called __self.html (of a window). can someone please tell me if its possible to get the following script to init my __self.html? // Copyright 2006 Google Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Known Issues: // // * Patterns are not implemented. // * Radial gradient are not implemented. The VML version of these look very // different from the canvas one. // * Clipping paths are not implemented. // * Coordsize. The width and height attribute have higher priority than the // width and height style values which isn't correct. // * Painting mode isn't implemented. // * Canvas width/height should is using content-box by default. IE in // Quirks mode will draw the canvas using border-box. Either change your // doctype to HTML5 // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype) // or use Box Sizing Behavior from WebFX // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html) // * Optimize. There is always room for speed improvements. // only add this code if we do not already have a canvas implementation if (!window.CanvasRenderingContext2D) { (function () { // alias some functions to make (compiled) code shorter var m = Math; var mr = m.round; var ms = m.sin; var mc = m.cos; // this is used for sub pixel precision var Z = 10; var Z2 = Z / 2; var G_vmlCanvasManager_ = { init: function (opt_doc) { var doc = opt_doc || document; if (/MSIE/.test(navigator.userAgent) && !window.opera) { var self = this; doc.attachEvent("onreadystatechange", function () { self.init_(doc); }); } }, init_: function (doc) { if (doc.readyState == "complete") { // create xmlns if (!doc.namespaces["g_vml_"]) { doc.namespaces.add("g_vml_", "urn:schemas-microsoft-com:vml"); } // setup default css var ss = doc.createStyleSheet(); ss.cssText = "canvas{display:inline-block;overflow:hidden;" + // default size is 300x150 in Gecko and Opera "text-align:left;width:300px;height:150px}" + "g_vml_\\:*{behavior:url(#default#VML)}"; // find all canvas elements var els = doc.getElementsByTagName("canvas"); for (var i = 0; i < els.length; i++) { if (!els[i].getContext) { this.initElement(els[i]); } } } }, fixElement_: function (el) { // in IE before version 5.5 we would need to add HTML: to the tag name // but we do not care about IE before version 6 var outerHTML = el.outerHTML; var newEl = el.ownerDocument.createElement(outerHTML); // if the tag is still open IE has created the children as siblings and // it has also created a tag with the name "/FOO" if (outerHTML.slice(-2) != "/>") { var tagName = "/" + el.tagName; var ns; // remove content while ((ns = el.nextSibling) && ns.tagName != tagName) { ns.removeNode(); } // remove the incorrect closing tag if (ns) { ns.removeNode(); } } el.parentNode.replaceChild(newEl, el); return newEl; }, /** * Public initializes a canvas element so that it can be used as canvas * element from now on. This is called automatically before the page is * loaded but if you are creating elements using createElement you need to * make sure this is called on the element. * @param {HTMLElement} el The canvas element to initialize. * @return {HTMLElement} the element that was created. */ initElement: function (el) { el = this.fixElement_(el); el.getContext = function () { if (this.context_) { return this.context_; } return this.context_ = new CanvasRenderingContext2D_(this); }; // do not use inline function because that will leak memory el.attachEvent('onpropertychange', onPropertyChange); el.attachEvent('onresize', onResize); var attrs = el.attributes; if (attrs.width && attrs.