// There are two objects defined in this file: // "slide" - contains all the information for a single slide // "slideshow" - consists of multiple slide objects and runs the slideshow //================================================== // slide object //================================================== function slide(src,attr,timeout) { // This is the constructor function for the slide object. // It is called automatically when you create a new slide object. // For example: // s = new slide(); // Image URL this.src = src; // Custom duration for the slide, in milliseconds. // This is an optional parameter. this.timeout = timeout // Attributes for the target window: // width=n,height=n,resizable=yes or no,scrollbars=yes or no, // toolbar=yes or no,location=yes or no,directories=yes or no, // status=yes or no,menubar=yes or no,copyhistory=yes or no // Example: "width=100,height=100" this.attr = attr; // Create an image object for the slide if (document.images) { this.image = new Image(); } // Flag to tell when load() has already been called this.loaded = false; //-------------------------------------------------- this.load = function() { // This method loads the image for the slide if (!document.images) { return; } if (!this.loaded) { this.image.src = this.src; this.loaded = true; } } } //================================================== // slideshow object //================================================== function slideshow( slideshowname ) { // This is the constructor function for the slideshow object. // It is called automatically when you create a new object. // For example: // ss = new slideshow("ss"); // Name of this object // (required if you want your slideshow to auto-play) // For example, "SLIDES1" this.name = slideshowname; // When we reach the last slide, should we loop around to start the // slideshow again? this.repeat = true; // Number of images to pre-fetch. // -1 = preload all images. // 0 = load each image is it is used. // n = pre-fetch n images ahead of the current image. // I recommend preloading all images unless you have large // images, or a large amount of images. this.prefetch = -1; // IMAGE element on your HTML page. // For example, document.images.SLIDES1IMG this.image; // These are private variables this.slides = new Array(); this.current = 0; this.timeoutid = 0; //-------------------------------------------------- // Public methods //-------------------------------------------------- this.add_slide = function(slide) { // Add a slide to the slideshow. // For example: // SLIDES1.add_slide(new slide("s1.jpg", "link.html")) var i = this.slides.length; // Prefetch the slide image if necessary if (this.prefetch == -1) { slide.load(); } this.slides[i] = slide; } //-------------------------------------------------- this.play = function(timeout) { // This method implements the automatically running slideshow. // If you specify the "timeout" argument, then a new default // timeout will be set for the slideshow. // Make sure we're not already playing this.pause(); // If the timeout argument was specified (optional) // then make it the new default if (timeout) { this.timeout = timeout; } // If the current slide has a custom timeout, use it; // otherwise use the default timeout if (typeof this.slides[ this.current ].timeout != 'undefined') { timeout = this.slides[ this.current ].timeout; } else { timeout = this.timeout; } // After the timeout, call this.loop() this.timeoutid = setTimeout( this.name + ".loop()", timeout); } //-------------------------------------------------- this.pause = function() { // This method stops the slideshow if it is automatically running. if (this.timeoutid != 0) { clearTimeout(this.timeoutid); this.timeoutid = 0; } } //-------------------------------------------------- this.update = function() { // This method updates the slideshow image on the page // Make sure the slideshow has been initialized correctly if (! this.valid_image()) { return; } // Call the pre-update hook function if one was specified if (typeof this.pre_update_hook == 'function') { this.pre_update_hook(); } // Convenience variable for the current slide var slide = this.slides[ this.current ]; // Determine if the browser supports filters var dofilter = false; if (this.image && typeof this.image.filters != 'undefined' && typeof this.image.filters[0] != 'undefined') { dofilter = true; } // Load the slide image if necessary slide.load(); // Apply the filters for the image transition if (dofilter) { // If the user has specified a custom filter for this slide, // then set it now if (slide.filter && this.image.style && this.image.style.filter) { this.image.style.filter = slide.filter; } this.image.filters[0].Apply(); } // Update the image. this.image.src = slide.image.src; // Play the image transition filters if (dofilter) { this.image.filters[0].Play(); } // Call the post-update hook function if one was specified if (typeof this.post_update_hook == 'function') { this.post_update_hook(); } // Do we need to pre-fetch images? if (this.prefetch > 0) { var next, prev, count; // Pre-fetch the next slide image(s) next = this.current; prev = this.current; count = 0; do { // Get the next and previous slide number // Loop past the ends of the slideshow if necessary if (++next >= this.slides.length) next = 0; if (--prev < 0) prev = this.slides.length - 1; // Preload the slide image this.slides[next].load(); this.slides[prev].load(); // Keep going until we have fetched // the designated number of slides } while (++count < this.prefetch); } } //-------------------------------------------------- this.next = function() { // This method advances to the next slide. // Increment the image number if (this.current < this.slides.length - 1) { this.current++; } else if (this.repeat) { this.current = 0; } this.update(); } //-------------------------------------------------- this.previous = function() { // This method goes to the previous slide. // Decrement the image number if (this.current > 0) { this.current--; } else if (this.repeat) { this.current = this.slides.length - 1; } this.update(); } //================================================== // Private methods //================================================== //-------------------------------------------------- this.loop = function() { // This method is for internal use only. // This method gets called automatically by a JavaScript timeout. // It advances to the next slide, then sets the next timeout. // If the next slide image has not completed loading yet, // then do not advance to the next slide yet. // Make sure the next slide image has finished loading if (this.current < this.slides.length - 1) { next_slide = this.slides[this.current + 1]; if (next_slide.image.complete == null || next_slide.image.complete) { this.next(); } } else { // we're at the last slide this.next(); } // Keep playing the slideshow this.play( ); } //-------------------------------------------------- this.valid_image = function() { // Returns 1 if a valid image has been set for the slideshow if (!this.image) { return false; } else { return true; } } //-------------------------------------------------- this.getElementById = function(element_id) { // This method returns the element corresponding to the id if (document.getElementById) { return document.getElementById(element_id); } else if (document.all) { return document.all[element_id]; } else if (document.layers) { return document.layers[element_id]; } else { return undefined; } } } //************************************************************** //******************** setup functions ************************* //************************************************************** function SidemenuSetup() { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp = new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.open("GET","/data/slideshow_sidemenu.xml",false); xmlhttp.send(); xmlDoc=xmlhttp.responseXML; var slide = xmlDoc.getElementsByTagName("slide"); for (i=0; i