有人可以推荐一个易于使用的 ExtJS 4 Lightbox 插件吗？
目前我能做的最好的是http://dev.sencha.com/playpen/ext-core-latest/examples/lightbox/ .这与 ExtJS 3 相关，我在 ExtJS 4 中找不到等效项。
最佳答案
我找到了 ExtJS4 的改编版本 here .
/*!
* Based on the lightbox implementation in Ext Core Library 3.0
* http://www.lyquidity.com/
* Copyright(c) 2012, Lyquidity Solutions Limited.
*
* MIT Licensed - http://extjs.com/license/mit.txt
*/
Ext.define('Ext.ux.Lightbox', {
extend: 'Ext.Component',
alias: 'widget.lightbox',
id: 'ux-lightbox',
/**
* @cfg {int} activeImage The index of the current image.
*/
activeImage: undefined,
/**
* @cfg {boolean} animate True if the image change transition is to be animated.
*/
animate: true,
/**
* @cfg {int} borderSize The size of the image border.
*/
borderSize: 10,
/**
* @cfg {string} labelImage The term for 'image'.
*/
labelImage: "Image",
/**
* @cfg {string} labelOf The term for 'of' as in '3 of 7'.
*/
labelOf: "of",
/**
* @cfg {int} overlayOpacity The relativ opacity of the overlay (background). Default: 0.85.
*/
overlayOpacity: 0.85,
/**
* @cfg {HtmlElement} renderTo The element to which the lightbox will be rendered. Defaults to the body.
*/
renderTo: Ext.getBody(),
/**
* @cfg {int} resizeSpeed Time in milliseconds for the lightbox to resize to a new image. Default: 600ms.
*/
resizeSpeed: 600,
/**
* @cfg {string} containerTag The tag which contains the <img> tag. Default: 'a'.
*/
containerTag: 'a',
/**
* @cfg {string} missingImage The image to use to represent a missing image. Default: missing.png.
*/
missingImage: 'missing.png',
childEls: ['outerImageContainer', 'imageContainer', 'image', 'hoverNav', 'navPrev', 'navNext',
'outerDataContainer', 'dataContainer', 'data', 'details', 'caption', 'imageNumber', 'bottomNav', 'navClose'],
initComponent: function()
{
var me = this;
// This weirdness is here because I'm simulating what happens in the Designer
// which has a bug because renderTpl is set to null by ExtJS so Ext.applyIf()
// has no effect. Setting renderTpl to undefined solves the problem.
// You can remove this by using Ext.apply() instead or by moving the renderTpl
// out of the initComponent function.
this.renderTpl = undefined;
Ext.applyIf(me, {
renderTpl: [
'<div id="ux-lightbox-outerImageContainer">',
' <div id="ux-lightbox-imageContainer">',
' <img id="ux-lightbox-image">',
' <div id="ux-lightbox-hoverNav">',
' <a href="#" id="ux-lightbox-navPrev"></a>',
' <a href="#" id="ux-lightbox-navNext"></a>',
' </div>',
' </div>',
'</div>',
'<div id="ux-lightbox-outerDataContainer">',
' <div id="ux-lightbox-dataContainer">',
' <div id="ux-lightbox-data">',
' <div id="ux-lightbox-details">',
' <span id="ux-lightbox-caption"></span>',
' <span id="ux-lightbox-imageNumber"></span>',
' </div>',
' <div id="ux-lightbox-bottomNav">',
' <a href="#" id="ux-lightbox-navClose"></a>',
' </div>',
' </div>',
' </div>',
'</div>'
],
images: [],
selectors: [],
listeners: {
beforerender: {
fn: me.onComponentBeforeRender,
scope: me
},
afterrender: {
fn: me.onComponentAfterRender,
scope: me
}
}
});
this.resizeDuration = this.animate ? this.resizeSpeed : 0;
this.overlayDuration = this.animate ? 200 : 0;
this.addEvents('open', 'close');
this.callParent(arguments);
},
onComponentBeforeRender: function () {
var me = this;
this.shim = Ext.DomHelper.append( this.renderTo,
{
tag: 'iframe',
id: 'ux-lightbox-shim'
}, true);
this.overlay = Ext.DomHelper.append(this.renderTo, {
id: 'ux-lightbox-overlay'
}, true);
},
onComponentAfterRender: function (container, position) {
var me = this;
Ext.each([this.overlay, this.shim, this.el], function(el){
el.setVisibilityMode(Ext.Element.DISPLAY).hide();
});
this.setVisible(false).setPosition(0, 20);
var size = (this.animate ? 250 : 1);
this.outerImageContainer.setSize(size,size);
this.outerDataContainer.setWidth(size).hide();
// Initialize events
var close = function(ev)
{
ev.preventDefault();
this.close();
};
this.overlay.on('click', close, this);
this.navClose.on('click', close, this);
this.el.on('click', function(ev)
{
if(ev.getTarget().id == this.getId())
this.close();
}, this);
this.navPrev.on('click', function(ev)
{
ev.preventDefault();
this.setImage(this.activeImage - 1);
}, this);
this.navNext.on('click', function(ev)
{
ev.preventDefault();
this.setImage(this.activeImage + 1);
}, this);
},
/**
* Called by user to register the images to include in the lightbox
* @property register
* @type Function
* @param {String} The selector to find the images in 'container' to register
* @param {boolean} True if the images are a group
* @param {String} The container which holds the images to use. Default: body
*/
register: function(sel, group, container)
{
this.thumbnailContainer = container
? container
: Ext.getBody();
if (this.renderTo != Ext.getBody())
{
this.renderTo.setStyle({position:'relative'});
}
var selector = {sel: sel, group: group};
var length = Ext.Array.filter(this.selectors, function(item) { return item.sel === sel; }, this).length;
if(length === 0)
{
this.selectors.push(selector);
// This ability to use functions like 'on' against the result of Ext.fly() or Ext.select() is good
Ext.select(sel, true, this.thumbnailContainer.dom).on('click', this.click, this);
}
},
/**
* Private function to handle the image click event
* @property click
* @type Function
* @param {HTMLElement} ev The contained item pressed
*/
click: function(ev)
{
try
{
// Get the parent of the clicked element which is the container
var up = Ext.get(ev.target).up(this.containerTag);
var target = undefined;
var selector = undefined;
Ext.each(this.selectors, function(item)
{
var els = Ext.select(item.sel, true);
var i = els.indexOf(up);
if (i === -1) return;
target = ev.getTarget(item.sel);
selector = item;
}, true );
if (target)
{
ev.preventDefault();
this.open(target, selector.sel, selector.group);
}
}
catch (e)
{
console.log(e.message);
}
},
remove: function()
{
this.clear();
Ext.enableNestedListenerRemoval = true;
Ext.each([this.overlay, this.shim], function(node)
{
if (!node) return;
Ext.removeNode(node.dom);
delete node;
});
this.destroy();
},
/**
* Clears the click events on all registered images
* @property clear
* @type Function
*/
clear: function()
{
this.close();
if (!this.selectors) return;
Ext.each(this.selectors, function(item)
{
Ext.select(item.sel, true, this.thumbnailContainer.dom).un('click', this.click, this);
},this);
this.selectors = [];
this.images = [];
},
/**
* Called automatically when the page has completely loaded. This is an empty function that should be
* overridden by each application that needs to take action on page load
* @property launch
* @type Function
* @param {HTMLElement} image The element containing the item to display
* @param {String} sel The selector for the image
* @param {Boolean} group True if this image is part of a group
*/
open: function(image, sel, group)
{
// Close the image if on is already open
if (this.isVisible())
{
Ext.callback( this.close, this, [this.open,image, sel, group] );
return;
}
group = group || false;
this.setViewSize();
this.overlay.setTop(0);
this.overlay.setLeft(0);
this.overlay.show();
this.overlay.setOpacity(0);
this.overlay.fadeIn({
duration: this.overlayDuration,
opacity: this.overlayOpacity,
callback: function() {
this.images = [];
var index = 0;
if(!group) {
this.images.push([image.href, image.title]);
}
else {
var setItems = Ext.query(sel,this.thumbnailContainer);
Ext.each(setItems, function(item){
var href = item.href;
href = item.getAttribute('href');
if(href) {
this.images.push([href, item.title]);
}
}, this);
while (index < this.images.length && this.images[index][0] != image.getAttribute('href')) {
index++;
}
}
// calculate top and left offset for the lightbox
var pageScroll = Ext.fly(this.renderTo.dom).getScroll();
var size = this.getViewSize();
var lightboxLeft = pageScroll.left;
this.setHeight(size.height);
this.setWidth(size.width);
this.setVisible(true);
this.setImage(index);
this.fireEvent('open', index == this.images.length ? undefined : this.images[index]);
},
scope: this
});
},
setViewSize: function()
{
var viewSize = this.getViewSize();
this.overlay.setStyle({
width: viewSize.width + 'px',
height: viewSize.height + 'px'
});
this.shim.setStyle({
width: viewSize.width + 'px',
height: viewSize.height + 'px'
}).show();
},
setImage: function(index)
{
this.activeImage = index;
this.disableKeyNav();
if (this.animate)
this.showMask();
this.image.fadeOut({
duration: this.resizeDuration,
scope: this,
callback: function()
{
this.image.hide();
delete this.lastImage;
this.hoverNav.hide();
this.navPrev.hide();
this.navNext.hide();
this.dataContainer.setOpacity(0.0001);
this.imageNumber.hide();
var imageSrc = (this.activeImage >= this.images.length)
? this.missingImage
: this.images[this.activeImage][0];
this.preview = Ext.create('Ext.Img',
{
src: imageSrc,
hidden: true,
renderTo: Ext.getBody(),
listeners : {
load : {
element : 'el', //the rendered img element
fn : function()
{
this.image.dom.src = this.preview.src;
this.resizeImage(this.preview.el.dom.width, this.preview.el.dom.height);
Ext.removeNode(this.preview.el.dom);
delete this.preview;
},
scope: this
}
}
});
}
});
},
resizeImage: function(w, h)
{
this.hideMask();
var wCur = this.outerImageContainer.getWidth();
var hCur = this.outerImageContainer.getHeight();
// The w and h could exceed the displayable area so this
// should be checked and the w/h changed accordingly.
var guesstimateDetailsSize = 60;
var size = this.getViewSize();
while ((w+this.borderSize * 2 > size.width) || (h+this.borderSize * 2 + guesstimateDetailsSize > size.height))
{
if (w+this.borderSize * 2 > size.width)
{
// Compute the new width
var wtemp = size.width - this.borderSize * 2;
// Compute the corresponding height so the aspect ratio remains the same
var htemp = Math.abs(wtemp/w*h);
w = wtemp;
h = htemp;
}
if (h+this.borderSize * 2 + guesstimateDetailsSize > size.height)
{
// Compute the new height
var htemp = size.height - guesstimateDetailsSize - this.borderSize * 2;
// Compute the corresponding width so the aspect ratio remains the same
var wtemp = Math.abs(htemp/h*w);
w = wtemp;
h = htemp;
}
}
var wNew = (w + this.borderSize * 2);
var hNew = (h + this.borderSize * 2);
var wDiff = wCur - wNew;
var hDiff = hCur - hNew;
var afterResize = function(){
this.hoverNav.setWidth(this.imageContainer.getWidth() + 'px');
this.navPrev.setHeight(h + 'px');
this.navNext.setHeight(h + 'px');
this.outerDataContainer.setWidth(wNew + 'px');
this.outerDataContainer.show();
this.showImage(w,h);
};
if (hDiff != 0 || wDiff != 0)
{
this.outerImageContainer.animate(
{
height: hNew,
width: wNew,
duration: this.resizeDuration,
scope: this,
callback: afterResize,
delay: 50
});
}
else
{
afterResize.call(this);
}
},
hideMask: function()
{
if (Ext.getVersion().major === 4 && Ext.getVersion().minor === 0)
{
if (!this.mask) return
this.mask.hide();
}
else
this.imageContainer.unmask();
},
showMask: function()
{
if (Ext.getVersion().major === 4 && Ext.getVersion().minor === 0)
{
if (!this.mask)
{
this.mask = new Ext.LoadMask(this.imageContainer, {});
}
this.mask.show();
}
else
this.imageContainer.mask('Loading image...');
},
showImage: function(w,h)
{
// Is it already displayed?
if (this.lastImage && this.lastImage == this.image.dom.src)
return;
this.lastImage = this.image.dom.src;
this.image.setWidth(w);
this.image.setHeight(h);
this.image.setOpacity(0);
this.image.show({
duration: this.resizeDuration,
scope: this,
callback: this.updateDetails()
});
this.preloadImages();
},
updateDetails: function()
{
var detailsWidth = this.data.getWidth(true) - this.navClose.getWidth() - 10;
this.details.setWidth((detailsWidth > 0 ? detailsWidth : 0) + 'px');
this.caption.update((this.activeImage >= this.images.length) ? '' : this.images[this.activeImage][1]);
this.caption.show();
if (this.images.length > 1) {
this.imageNumber.update(this.labelImage + ' ' + (this.activeImage + 1) + ' ' + this.labelOf + ' ' + this.images.length);
this.imageNumber.show();
}
this.dataContainer.fadeIn({
duration: this.resizeDuration/2,
scope: this,
callback: function() {
var viewSize = this.getViewSize();
this.overlay.setHeight(viewSize.height + 'px');
var total = this.outerDataContainer.getHeight() + this.outerImageContainer.getHeight();
this.setHeight(total);
var position = this.getPosition(true);
var distance = Math.abs((this.getViewSize().height - total)/2) - position[1];
this.el.move("b", distance, {
duration: this.resizeDuration,
scope: this,
callback: this.updateNav()
});
}
});
},
updateNav: function()
{
this.enableKeyNav();
this.hoverNav.show();
// if not first image in set, display prev image button
if (this.activeImage > 0)
this.navPrev.show();
// if not last image in set, display next image button
if (this.activeImage < (this.images.length - 1))
this.navNext.show();
},
enableKeyNav: function()
{
Ext.fly(this.renderTo.dom).on('keydown', this.keyNavAction, this);
},
disableKeyNav: function()
{
Ext.fly(this.renderTo.dom).un('keydown', this.keyNavAction, this);
},
keyNavAction: function(ev)
{
var keyCode = ev.getKey();
if (
keyCode == 88 || // x
keyCode == 67 || // c
keyCode == 27
) {
this.close();
}
else if (keyCode == 80 || keyCode == 37){ // display previous image
if (this.activeImage != 0){
this.setImage(this.activeImage - 1);
}
}
else if (keyCode == 78 || keyCode == 39){ // display next image
if (this.activeImage != (this.images.length - 1)){
this.setImage(this.activeImage + 1);
}
}
},
preloadImages: function()
{
var next, prev;
if (this.images.length > this.activeImage + 1)
{
next = new Image();
next.src = this.images[this.activeImage + 1][0];
}
if (this.activeImage > 0)
{
prev = new Image();
prev.src = this.images[this.activeImage - 1][0];
}
},
close: function(callback,image, sel, group)
{
if (!this.isVisible()) return;
this.hideMask();
this.disableKeyNav();
this.setVisible(false);
this.shim.hide();
this.overlay.fadeOut({
duration: this.overlayDuration,
stopAnimation: true,
scope: this,
callback: function()
{
if (this.overlay)
this.overlay.hide();
if (callback)
Ext.callback(callback, this, [image, sel, group], 1);
}
});
this.fireEvent('close', this.activeImage);
},
getViewSize: function()
{
return {width: this.renderTo.getWidth(), height: this.renderTo.getHeight()};
}
});
关于javascript - 我在哪里可以找到一个易于使用的 Lightbox for ExtJS 4？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8512377/