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upgrade holder.js to v2.1

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This commit is contained in:
Chris Rebert 2013-10-09 18:52:19 -07:00
parent a388b7906e
commit 1a0df1fbd0
1 changed files with 205 additions and 220 deletions
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391
docs-assets/js/holder.js Normal file → Executable file
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@ -1,9 +1,9 @@
/* /*
Holder - 2.0 - client side image placeholders Holder - 2.1 - client side image placeholders
(c) 2012-2013 Ivan Malopinsky / http://imsky.co (c) 2012-2013 Ivan Malopinsky / http://imsky.co
Provided under the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0 Provided under the MIT License.
Commercial use requires attribution. Commercial use requires attribution.
*/ */
@ -15,176 +15,6 @@ var preempted = false,
fallback = false, fallback = false,
canvas = document.createElement('canvas'); canvas = document.createElement('canvas');
//getElementsByClassName polyfill
document.getElementsByClassName||(document.getElementsByClassName=function(e){var t=document,n,r,i,s=[];if(t.querySelectorAll)return t.querySelectorAll("."+e);if(t.evaluate){r=".//*[contains(concat(' ', @class, ' '), ' "+e+" ')]",n=t.evaluate(r,t,null,0,null);while(i=n.iterateNext())s.push(i)}else{n=t.getElementsByTagName("*"),r=new RegExp("(^|\\s)"+e+"(\\s|$)");for(i=0;i<n.length;i++)r.test(n[i].className)&&s.push(n[i])}return s})
//getComputedStyle polyfill
window.getComputedStyle||(window.getComputedStyle=function(e,t){return this.el=e,this.getPropertyValue=function(t){var n=/(\-([a-z]){1})/g;return t=="float"&&(t="styleFloat"),n.test(t)&&(t=t.replace(n,function(){return arguments[2].toUpperCase()})),e.currentStyle[t]?e.currentStyle[t]:null},this})
//http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications
function contentLoaded(n,t){var l="complete",s="readystatechange",u=!1,h=u,c=!0,i=n.document,a=i.documentElement,e=i.addEventListener?"addEventListener":"attachEvent",v=i.addEventListener?"removeEventListener":"detachEvent",f=i.addEventListener?"":"on",r=function(e){(e.type!=s||i.readyState==l)&&((e.type=="load"?n:i)[v](f+e.type,r,u),!h&&(h=!0)&&t.call(n,null))},o=function(){try{a.doScroll("left")}catch(n){setTimeout(o,50);return}r("poll")};if(i.readyState==l)t.call(n,"lazy");else{if(i.createEventObject&&a.doScroll){try{c=!n.frameElement}catch(y){}c&&o()}i[e](f+"DOMContentLoaded",r,u),i[e](f+s,r,u),n[e](f+"load",r,u)}};
//https://gist.github.com/991057 by Jed Schmidt with modifications
function selector(a){
a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]);
var ret=[]; b!=null&&(b.length?ret=b:b.length==0?ret=b:ret=[b]); return ret;
}
//shallow object property extend
function extend(a,b){var c={};for(var d in a)c[d]=a[d];for(var e in b)c[e]=b[e];return c}
//hasOwnProperty polyfill
if (!Object.prototype.hasOwnProperty)
Object.prototype.hasOwnProperty = function(prop) {
var proto = this.__proto__ || this.constructor.prototype;
return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
}
function text_size(width, height, template) {
height = parseInt(height,10);
width = parseInt(width,10);
var bigSide = Math.max(height, width)
var smallSide = Math.min(height, width)
var scale = 1 / 12;
var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale);
return {
height: Math.round(Math.max(template.size, newHeight))
}
}
function draw(ctx, dimensions, template, ratio) {
var ts = text_size(dimensions.width, dimensions.height, template);
var text_height = ts.height;
var width = dimensions.width * ratio,
height = dimensions.height * ratio;
var font = template.font ? template.font : "sans-serif";
canvas.width = width;
canvas.height = height;
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.fillStyle = template.background;
ctx.fillRect(0, 0, width, height);
ctx.fillStyle = template.foreground;
ctx.font = "bold " + text_height + "px " + font;
var text = template.text ? template.text : (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height));
var text_width = ctx.measureText(text).width;
if (text_width / width >= 0.75) {
text_height = Math.floor(text_height * 0.75 * (width/text_width));
}
//Resetting font size if necessary
ctx.font = "bold " + (text_height * ratio) + "px " + font;
ctx.fillText(text, (width / 2), (height / 2), width);
return canvas.toDataURL("image/png");
}
function render(mode, el, holder, src) {
var dimensions = holder.dimensions,
theme = holder.theme,
text = holder.text ? decodeURIComponent(holder.text) : holder.text;
var dimensions_caption = dimensions.width + "x" + dimensions.height;
theme = (text ? extend(theme, {
text: text
}) : theme);
theme = (holder.font ? extend(theme, {
font: holder.font
}) : theme);
if (mode == "image") {
el.setAttribute("data-src", src);
el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);
if (fallback || !holder.auto) {
el.style.width = dimensions.width + "px";
el.style.height = dimensions.height + "px";
}
if (fallback) {
el.style.backgroundColor = theme.background;
} else {
el.setAttribute("src", draw(ctx, dimensions, theme, ratio));
}
} else if (mode == "background") {
if (!fallback) {
el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")";
el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px";
}
} else if (mode == "fluid") {
el.setAttribute("data-src", src);
el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);
if (dimensions.height.substr(-1) == "%") {
el.style.height = dimensions.height
} else {
el.style.height = dimensions.height + "px"
}
if (dimensions.width.substr(-1) == "%") {
el.style.width = dimensions.width
} else {
el.style.width = dimensions.width + "px"
}
if (el.style.display == "inline" || el.style.display == "") {
el.style.display = "block";
}
if (fallback) {
el.style.backgroundColor = theme.background;
} else {
el.holderData = holder;
fluid_images.push(el);
fluid_update(el);
}
}
};
function fluid_update(element) {
var images;
if (element.nodeType == null) {
images = fluid_images;
} else {
images = [element]
}
for (i in images) {
var el = images[i]
if (el.holderData) {
var holder = el.holderData;
el.setAttribute("src", draw(ctx, {
height: el.clientHeight,
width: el.clientWidth
}, holder.theme, ratio));
}
}
}
function parse_flags(flags, options) {
var ret = {
theme: settings.themes.gray
}, render = false;
for (sl = flags.length, j = 0; j < sl; j++) {
var flag = flags[j];
if (app.flags.dimensions.match(flag)) {
render = true;
ret.dimensions = app.flags.dimensions.output(flag);
} else if (app.flags.fluid.match(flag)) {
render = true;
ret.dimensions = app.flags.fluid.output(flag);
ret.fluid = true;
} else if (app.flags.colors.match(flag)) {
ret.theme = app.flags.colors.output(flag);
} else if (options.themes[flag]) {
//If a theme is specified, it will override custom colors
ret.theme = options.themes[flag];
} else if (app.flags.text.match(flag)) {
ret.text = app.flags.text.output(flag);
} else if (app.flags.font.match(flag)) {
ret.font = app.flags.font.output(flag);
} else if (app.flags.auto.match(flag)) {
ret.auto = true;
}
}
return render ? ret : false;
};
if (!canvas.getContext) { if (!canvas.getContext) {
fallback = true; fallback = true;
} else { } else {
@ -206,8 +36,181 @@ if(!fallback){
var ratio = dpr / bsr; var ratio = dpr / bsr;
var fluid_images = []; //getElementsByClassName polyfill
document.getElementsByClassName||(document.getElementsByClassName=function(e){var t=document,n,r,i,s=[];if(t.querySelectorAll)return t.querySelectorAll("."+e);if(t.evaluate){r=".//*[contains(concat(' ', @class, ' '), ' "+e+" ')]",n=t.evaluate(r,t,null,0,null);while(i=n.iterateNext())s.push(i)}else{n=t.getElementsByTagName("*"),r=new RegExp("(^|\\s)"+e+"(\\s|$)");for(i=0;i<n.length;i++)r.test(n[i].className)&&s.push(n[i])}return s})
//getComputedStyle polyfill
window.getComputedStyle||(window.getComputedStyle=function(e){return this.el=e,this.getPropertyValue=function(t){var n=/(\-([a-z]){1})/g;return t=="float"&&(t="styleFloat"),n.test(t)&&(t=t.replace(n,function(){return arguments[2].toUpperCase()})),e.currentStyle[t]?e.currentStyle[t]:null},this})
//http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications
function contentLoaded(n,t){var l="complete",s="readystatechange",u=!1,h=u,c=!0,i=n.document,a=i.documentElement,e=i.addEventListener?"addEventListener":"attachEvent",v=i.addEventListener?"removeEventListener":"detachEvent",f=i.addEventListener?"":"on",r=function(e){(e.type!=s||i.readyState==l)&&((e.type=="load"?n:i)[v](f+e.type,r,u),!h&&(h=!0)&&t.call(n,null))},o=function(){try{a.doScroll("left")}catch(n){setTimeout(o,50);return}r("poll")};if(i.readyState==l)t.call(n,"lazy");else{if(i.createEventObject&&a.doScroll){try{c=!n.frameElement}catch(y){}c&&o()}i[e](f+"DOMContentLoaded",r,u),i[e](f+s,r,u),n[e](f+"load",r,u)}}
//https://gist.github.com/991057 by Jed Schmidt with modifications
function selector(a){
a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]);
var ret=[]; b!==null&&(b.length?ret=b:b.length===0?ret=b:ret=[b]); return ret;
}
//shallow object property extend
function extend(a,b){var c={};for(var d in a)c[d]=a[d];for(var e in b)c[e]=b[e];return c}
//hasOwnProperty polyfill
if (!Object.prototype.hasOwnProperty)
/*jshint -W001, -W103 */
Object.prototype.hasOwnProperty = function(prop) {
var proto = this.__proto__ || this.constructor.prototype;
return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
}
/*jshint +W001, +W103 */
function text_size(width, height, template) {
height = parseInt(height, 10);
width = parseInt(width, 10);
var bigSide = Math.max(height, width)
var smallSide = Math.min(height, width)
var scale = 1 / 12;
var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale);
return {
height: Math.round(Math.max(template.size, newHeight))
}
}
function draw(ctx, dimensions, template, ratio, literal) {
var ts = text_size(dimensions.width, dimensions.height, template);
var text_height = ts.height;
var width = dimensions.width * ratio,
height = dimensions.height * ratio;
var font = template.font ? template.font : "sans-serif";
canvas.width = width;
canvas.height = height;
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.fillStyle = template.background;
ctx.fillRect(0, 0, width, height);
ctx.fillStyle = template.foreground;
ctx.font = "bold " + text_height + "px " + font;
var text = template.text ? template.text : (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height));
if (literal) {
text = template.literalText;
}
var text_width = ctx.measureText(text).width;
if (text_width / width >= 0.75) {
text_height = Math.floor(text_height * 0.75 * (width / text_width));
}
//Resetting font size if necessary
ctx.font = "bold " + (text_height * ratio) + "px " + font;
ctx.fillText(text, (width / 2), (height / 2), width);
return canvas.toDataURL("image/png");
}
function render(mode, el, holder, src) {
var dimensions = holder.dimensions,
theme = holder.theme,
text = holder.text ? decodeURIComponent(holder.text) : holder.text;
var dimensions_caption = dimensions.width + "x" + dimensions.height;
theme = (text ? extend(theme, {
text: text
}) : theme);
theme = (holder.font ? extend(theme, {
font: holder.font
}) : theme);
el.setAttribute("data-src", src);
theme.literalText = dimensions_caption;
holder.originalTheme = holder.theme;
holder.theme = theme;
if (mode == "image") {
el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);
if (fallback || !holder.auto) {
el.style.width = dimensions.width + "px";
el.style.height = dimensions.height + "px";
}
if (fallback) {
el.style.backgroundColor = theme.background;
} else {
el.setAttribute("src", draw(ctx, dimensions, theme, ratio));
}
} else if (mode == "background") {
if (!fallback) {
el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")";
el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px";
}
} else if (mode == "fluid") {
el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);
if (dimensions.height.slice(-1) == "%") {
el.style.height = dimensions.height
} else {
el.style.height = dimensions.height + "px"
}
if (dimensions.width.slice(-1) == "%") {
el.style.width = dimensions.width
} else {
el.style.width = dimensions.width + "px"
}
if (el.style.display == "inline" || el.style.display === "") {
el.style.display = "block";
}
if (fallback) {
el.style.backgroundColor = theme.background;
} else {
el.holderData = holder;
fluid_images.push(el);
fluid_update(el);
}
}
}
function fluid_update(element) {
var images;
if (element.nodeType == null) {
images = fluid_images;
} else {
images = [element]
}
for (var i in images) {
var el = images[i]
if (el.holderData) {
var holder = el.holderData;
el.setAttribute("src", draw(ctx, {
height: el.clientHeight,
width: el.clientWidth
}, holder.theme, ratio, !! holder.literal));
}
}
}
function parse_flags(flags, options) {
var ret = {
theme: settings.themes.gray
};
var render = false;
for (sl = flags.length, j = 0; j < sl; j++) {
var flag = flags[j];
if (app.flags.dimensions.match(flag)) {
render = true;
ret.dimensions = app.flags.dimensions.output(flag);
} else if (app.flags.fluid.match(flag)) {
render = true;
ret.dimensions = app.flags.fluid.output(flag);
ret.fluid = true;
} else if (app.flags.literal.match(flag)) {
ret.literal = true;
} else if (app.flags.colors.match(flag)) {
ret.theme = app.flags.colors.output(flag);
} else if (options.themes[flag]) {
//If a theme is specified, it will override custom colors
ret.theme = options.themes[flag];
} else if (app.flags.font.match(flag)) {
ret.font = app.flags.font.output(flag);
} else if (app.flags.auto.match(flag)) {
ret.auto = true;
} else if (app.flags.text.match(flag)) {
ret.text = app.flags.text.output(flag);
}
}
return render ? ret : false;
}
var fluid_images = [];
var settings = { var settings = {
domain: "holder.js", domain: "holder.js",
images: "img", images: "img",
@ -229,10 +232,8 @@ var settings = {
size: 12 size: 12
} }
}, },
stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}" stylesheet: ""
}; };
app.flags = { app.flags = {
dimensions: { dimensions: {
regex: /^(\d+)x(\d+)$/, regex: /^(\d+)x(\d+)$/,
@ -279,21 +280,21 @@ app.flags = {
}, },
auto: { auto: {
regex: /^auto$/ regex: /^auto$/
},
literal: {
regex: /^literal$/
} }
} }
for (var flag in app.flags) { for (var flag in app.flags) {
if (!app.flags.hasOwnProperty(flag)) continue; if (!app.flags.hasOwnProperty(flag)) continue;
app.flags[flag].match = function (val) { app.flags[flag].match = function (val) {
return val.match(this.regex) return val.match(this.regex)
} }
} }
app.add_theme = function (name, theme) { app.add_theme = function (name, theme) {
name != null && theme != null && (settings.themes[name] = theme); name != null && theme != null && (settings.themes[name] = theme);
return app; return app;
}; };
app.add_image = function (src, el) { app.add_image = function (src, el) {
var node = selector(el); var node = selector(el);
if (node.length) { if (node.length) {
@ -305,20 +306,18 @@ app.add_image = function (src, el) {
} }
return app; return app;
}; };
app.run = function (o) { app.run = function (o) {
var options = extend(settings, o), var options = extend(settings, o),
images = [], imageNodes = [], bgnodes = []; images = [],
imageNodes = [],
bgnodes = [];
if (typeof (options.images) == "string") { if (typeof (options.images) == "string") {
imageNodes = selector(options.images); imageNodes = selector(options.images);
} } else if (window.NodeList && options.images instanceof window.NodeList) {
else if (window.NodeList && options.images instanceof window.NodeList) {
imageNodes = options.images; imageNodes = options.images;
} else if (window.Node && options.images instanceof window.Node) { } else if (window.Node && options.images instanceof window.Node) {
imageNodes = [options.images]; imageNodes = [options.images];
} }
if (typeof (options.bgnodes) == "string") { if (typeof (options.bgnodes) == "string") {
bgnodes = selector(options.bgnodes); bgnodes = selector(options.bgnodes);
} else if (window.NodeList && options.elements instanceof window.NodeList) { } else if (window.NodeList && options.elements instanceof window.NodeList) {
@ -326,11 +325,8 @@ app.run = function (o) {
} else if (window.Node && options.bgnodes instanceof window.Node) { } else if (window.Node && options.bgnodes instanceof window.Node) {
bgnodes = [options.bgnodes]; bgnodes = [options.bgnodes];
} }
preempted = true; preempted = true;
for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]); for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]);
var holdercss = document.getElementById("holderjs-style"); var holdercss = document.getElementById("holderjs-style");
if (!holdercss) { if (!holdercss) {
holdercss = document.createElement("style"); holdercss = document.createElement("style");
@ -338,7 +334,6 @@ app.run = function (o) {
holdercss.type = "text/css"; holdercss.type = "text/css";
document.getElementsByTagName("head")[0].appendChild(holdercss); document.getElementsByTagName("head")[0].appendChild(holdercss);
} }
if (!options.nocss) { if (!options.nocss) {
if (holdercss.styleSheet) { if (holdercss.styleSheet) {
holdercss.styleSheet.cssText += options.stylesheet; holdercss.styleSheet.cssText += options.stylesheet;
@ -346,22 +341,18 @@ app.run = function (o) {
holdercss.appendChild(document.createTextNode(options.stylesheet)); holdercss.appendChild(document.createTextNode(options.stylesheet));
} }
} }
var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)"); var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)");
for (var l = bgnodes.length, i = 0; i < l; i++) { for (var l = bgnodes.length, i = 0; i < l; i++) {
var src = window.getComputedStyle(bgnodes[i], null) var src = window.getComputedStyle(bgnodes[i], null)
.getPropertyValue("background-image"); .getPropertyValue("background-image");
var flags = src.match(cssregex); var flags = src.match(cssregex);
var bgsrc = bgnodes[i].getAttribute("data-background-src"); var bgsrc = bgnodes[i].getAttribute("data-background-src");
if (flags) { if (flags) {
var holder = parse_flags(flags[1].split("/"), options); var holder = parse_flags(flags[1].split("/"), options);
if (holder) { if (holder) {
render("background", bgnodes[i], holder, src); render("background", bgnodes[i], holder, src);
} }
} } else if (bgsrc != null) {
else if(bgsrc != null){
var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1) var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1)
.split("/"), options); .split("/"), options);
if (holder) { if (holder) {
@ -369,22 +360,18 @@ app.run = function (o) {
} }
} }
} }
for (l = images.length, i = 0; i < l; i++) { for (l = images.length, i = 0; i < l; i++) {
var attr_data_src, attr_src;
var attr_src = attr_data_src = src = null; attr_src = attr_data_src = src = null;
try { try {
attr_src = images[i].getAttribute("src"); attr_src = images[i].getAttribute("src");
attr_datasrc = images[i].getAttribute("data-src"); attr_datasrc = images[i].getAttribute("data-src");
} catch (e) {} } catch (e) {}
if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) { if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) {
src = attr_src; src = attr_src;
} else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) { } else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) {
src = attr_datasrc; src = attr_datasrc;
} }
if (src) { if (src) {
var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1) var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1)
.split("/"), options); .split("/"), options);
@ -399,7 +386,6 @@ app.run = function (o) {
} }
return app; return app;
}; };
contentLoaded(win, function () { contentLoaded(win, function () {
if (window.addEventListener) { if (window.addEventListener) {
window.addEventListener("resize", fluid_update, false); window.addEventListener("resize", fluid_update, false);
@ -409,9 +395,8 @@ contentLoaded(win, function () {
} }
preempted || app.run(); preempted || app.run();
}); });
if (typeof define === "function" && define.amd) { if (typeof define === "function" && define.amd) {
define("Holder", [], function () { define([], function () {
return app; return app;
}); });
} }