https://lavoute.net/css/thumbnailviewer.js

1/*
2* - Gestion de la galerie photo
3*
4* Auteur : Dynamic Drive
5* Contact :	http://www.dynamicdrive.com/contact.htm
6*
7* Image Thumbnail Viewer Script- By Dynamic Drive, available at : http://www.dynamicdrive.com
8* 
9/* ----- Ne modifiez rien dans le code Javascript ci-dessous ----- */
10
11var thumbnailviewer={
12enableTitle: true, //Should "title" attribute of link be used as description?
13enableAnimation: true, //Enable fading animation?
14defineLoading: 'Chargement de l\'image...', //Define HTML for "loading" div
15
16scrollbarwidth: 16,
17opacitystring: 'filter:progid:DXImageTransform.Microsoft.alpha(opacity=10); -moz-opacity: 0.1; opacity: 0.1',
18targetlinks:[], //Array to hold links with rel="thumbnail"
19
20createthumbBox:function(){
21  document.write('<div id="thumbBox" onClick="thumbnailviewer.closeit()" title="Cliquez pour fermer l\'image"><div id="thumbImage"></div></div>')
22  document.write('<div id="thumbLoading">'+this.defineLoading+'</div>')
23  this.thumbBox=document.getElementById("thumbBox")
24  this.thumbImage=document.getElementById("thumbImage") //Reference div that holds the shown image
25  this.thumbLoading=document.getElementById("thumbLoading") //Reference "loading" div that will be shown while image is fetched
26  this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes
27},
28
29centerDiv:function(divobj){ //Centers a div element on the page
30  var ie=document.all && !window.opera
31  var dom=document.getElementById
32  var scroll_top=(ie)? this.standardbody.scrollTop : window.pageYOffset
33  var scroll_left=(ie)? this.standardbody.scrollLeft : window.pageXOffset
34  var docwidth=(ie)? this.standardbody.clientWidth : window.innerWidth-this.scrollbarwidth
35  var docheight=(ie)? this.standardbody.clientHeight: window.innerHeight
36  var docheightcomplete=(this.standardbody.offsetHeight>this.standardbody.scrollHeight)? this.standardbody.offsetHeight : this.standardbody.scrollHeight //Full scroll height of document
37  var objwidth=divobj.offsetWidth //width of div element
38  var objheight=divobj.offsetHeight //height of div element
39  var topposition=(docheight>objheight)? scroll_top+docheight/2-objheight/2+"px" : scroll_top+10+"px" //Vertical position of div element: Either centered, or if element height larger than viewpoint height, 10px from top of viewpoint
40  divobj.style.left=docwidth/2-objwidth/2+"px" //Center div element horizontally
41  divobj.style.top=Math.floor(parseInt(topposition))+"px"
42  divobj.style.visibility="visible"
43},
44
45showthumbBox:function(){ //Show ThumbBox div
46  this.centerDiv(this.thumbBox)
47  if (this.enableAnimation){ //If fading animation enabled
48    this.currentopacity=0.1 //Starting opacity value
49    this.opacitytimer=setInterval("thumbnailviewer.opacityanimation()", 20)
50  }
51},
52
53loadimage:function(link){ //Load image function that gets attached to each link on the page with rel="thumbnail"
54  if (this.thumbBox.style.visibility=="visible") //if thumbox is visible on the page already
55    this.closeit() //Hide it first (not doing so causes triggers some positioning bug in Firefox
56    var imageHTML='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />' //Construct HTML for shown image
57    if (this.enableTitle && link.getAttribute("title")) //Use title attr of the link as description?
58      var imageHTML=link.getAttribute("title")+'<br />';
59    imageHTML+='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />' //Construct HTML for shown image
60    imageHTML+='<br />'+link.getAttribute("title");
61    this.centerDiv(this.thumbLoading) //Center and display "loading" div while we set up the image to be shown
62    this.thumbImage.innerHTML=imageHTML //Populate thumbImage div with shown image's HTML (while still hidden)
63    this.featureImage=this.thumbImage.getElementsByTagName("img")[0] //Reference shown image itself
64    this.featureImage.onload=function(){ //When target image has completely loaded
65    thumbnailviewer.thumbLoading.style.visibility="hidden" //Hide "loading" div
66    thumbnailviewer.showthumbBox() //Display "thumbbox" div to the world!
67  }
68  if (document.all && !window.createPopup) //Target IE5.0 browsers only. Address IE image cache not firing onload bug: panoramio.com/blog/onload-event/
69    this.featureImage.src=link.getAttribute("href")
70    this.featureImage.onerror=function(){ //If an error has occurred while loading the image to show
71    thumbnailviewer.thumbLoading.style.visibility="hidden" //Hide "loading" div, game over
72  }
73},
74
75setimgopacity:function(value){ //Sets the opacity of "thumbimage" div per the passed in value setting (0 to 1 and in between)
76  var targetobject=this.featureImage
77  if (targetobject.filters && targetobject.filters[0]){ //IE syntax
78  if (typeof targetobject.filters[0].opacity=="number") //IE6
79    targetobject.filters[0].opacity=value*100
80  else //IE 5.5
81    targetobject.style.filter="alpha(opacity="+value*100+")"
82  }
83  else if (typeof targetobject.style.MozOpacity!="undefined") //Old Mozilla syntax
84    targetobject.style.MozOpacity=value
85  else if (typeof targetobject.style.opacity!="undefined") //Standard opacity syntax
86    targetobject.style.opacity=value
87  else //Non of the above, stop opacity animation
88    this.stopanimation()
89},
90
91opacityanimation:function(){ //Gradually increase opacity function
92  this.setimgopacity(this.currentopacity)
93  this.currentopacity+=0.1
94  if (this.currentopacity>1)
95    this.stopanimation()
96},
97
98stopanimation:function(){
99  if (typeof this.opacitytimer!="undefined")
100    clearInterval(this.opacitytimer)
101},
102
103closeit:function(){ //Close "thumbbox" div function
104  this.stopanimation()
105  this.thumbBox.style.visibility="hidden"
106  this.thumbImage.innerHTML=""
107  this.thumbBox.style.left="-2000px"
108  this.thumbBox.style.top="-2000px"
109},
110
111cleanup:function(){ //Clean up routine on page unload
112  this.thumbLoading=null
113  if (this.featureImage) this.featureImage.onload=null
114  this.featureImage=null
115  this.thumbImage=null
116  for (var i=0; i<this.targetlinks.length; i++)
117  this.targetlinks[i].onclick=null
118  this.thumbBox=null
119},
120
121dotask:function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)
122  var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
123  if (target.addEventListener)
124    target.addEventListener(tasktype, functionref, false)
125  else if (target.attachEvent)
126    target.attachEvent(tasktype, functionref)
127},
128
129init:function(){ //Initialize thumbnail viewer script by scanning page and attaching appropriate function to links with rel="thumbnail"
130  if (!this.enableAnimation)
131    this.opacitystring=""
132  var pagelinks=document.getElementsByTagName("a")
133  for (var i=0; i<pagelinks.length; i++){ //BEGIN FOR LOOP
134    if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel")=="thumbnail"){ //Begin if statement
135      pagelinks[i].onclick=function(){
136        thumbnailviewer.stopanimation() //Stop any currently running fade animation on "thumbbox" div before proceeding
137        thumbnailviewer.loadimage(this) //Load image
138        return false
139      }
140    this.targetlinks[this.targetlinks.length]=pagelinks[i] //store reference to target link
141    } //end if statement
142  } //END FOR LOOP
143
144  //Reposition "thumbbox" div when page is resized
145  this.dotask(window, function(){
146    if (thumbnailviewer.thumbBox.style.visibility=="visible")
147	  thumbnailviewer.centerDiv(thumbnailviewer.thumbBox)}, "resize")
148  } //END init() function
149}
150thumbnailviewer.createthumbBox() //Output HTML for the image thumbnail viewer
151thumbnailviewer.dotask(window, function(){thumbnailviewer.init()}, "load") //Initialize script on page load
152thumbnailviewer.dotask(window, function(){thumbnailviewer.cleanup()}, "unload")