//--------------------------------------------------------
// javascript slide show "clicker"
// v 4.1 January 2004
// created by alan levine, maricopa community colleges
// alan.levine@domail.maricopa.edu
// http://www.mcli.dist.maricopa.edu/proj/jclicker/
//
// GNU General Public License
// Copyright (C) 2004 Alan Levine
// See URL above for license
//--------------------------------------------------------
// CLICKER FUNCTIONS
// These are all of the general routines to respond to
// slide show interaction and set up. DO not edit unless
// you know your way in and out of JavaScript.
//--------------------------------------------------------
//--------------------------------------------------------
// PRELOAD IMAGES
// Preload images that are used for button swapping.
// Do not touch. Nothing to edit here.
var imgLoaded = 0;
var slide_count = 0;
if (!my_img_path) {
var my_img_path = 'images/';
}
// Check for undefined variables, set defaults
if (typeof close_button == 'undefined') {
close_button = false;
}
if (typeof help_button == 'undefined') {
help_button = true;
}
if (typeof resize_button == 'undefined') {
resize_button = true;
}
if (typeof auto_button == 'undefined') {
auto_button = true;
}
if (typeof auto_start == 'undefined') {
auto_start = false;
}
if (typeof show_file == 'undefined') {
show_file = false;
}
if (document.images) {
// left button graphics
var leftb_on = new Image(); // for the active image
leftb_on.src = "buttons/left.gif";
var leftb_off = new Image(); // for the inactive image
leftb_off.src = "buttons/left_off.gif";
// right button graphics
var rightb_on = new Image(); // for the active image
rightb_on.src = "buttons/right.gif";
var rightb_off = new Image(); // for the inactive image
rightb_off.src = "buttons/right_off.gif";
// loading status images
ready_n = new Image();
ready_n.src = "buttons/loading_blink.gif";
ready_y = new Image();
ready_y.src = "buttons/loading_ready.gif"
}
// set up linked style sheets and html header
if (light_mode) {
var myHeader = '';
} else {
var myHeader = '';
}
//--------------------------------------------------------
// SET READY FLAG
// Called when both images have been loaded on main display
// and sets the graphic to indicate state (loaded=1)
function ready_state (s_flag) {
if (s_flag == 0) {
imgLoaded = 0;
} else {
imgLoaded+=s_flag;
}
if (document.images) {
if (imgLoaded > 1) {
document.images.lstat.src = ready_y.src;
} else {
document.images.lstat.src = ready_n.src;
}
}
}
//--------------------------------------------------------
// SLIDE ADVANCER
// Called from a click on one of the slide buttons
// wDirection is either 1 or -1
function slideClick (wDirection) {
slide_count = slide_count + wDirection;
if (slide_count < 0 ) {
slide_count = 0;
} else {
playSlide(0,0);
}
}
//--------------------------------------------------------
// SLIDE MENU JUMPER
// Go to arbitrary slide from menu selection
function goSlide () {
// Update the slide counter based upon the menu item selected
slide_count = document.control.gomenu.selectedIndex;
if (slide_count == 0) {
// First menu item resets the show
setUp();
} else {
// Play the selected slide
playSlide(0,0);
}
}
//--------------------------------------------------------
// SLIDE PLAYER
// Called from several functions to set up the requested
// slide. Finds the appropriate display file, image
// or HTML, and displays in the top frame
function playSlide (iw,ih) {
// Check if we tried to go before the first slide
if (slide_count == 0) {
slide_count = 1;
alert ('This is the very first slide- you cannot go back farther!');
} else {
// Check if we went past the last slide
if (slide_count == slides.length) {
slide_count = slides.length - 1;
alert ('This is the very last slide- you cannot go ahead!');
} else {
// Set state of "loading..."
ready_state(0);
// Set left button image
if (slide_count == 1) {
if (document.images) {
document.images.leftb.src = leftb_off.src;
}
} else {
if (document.images) {
document.images.leftb.src = leftb_on.src;
}
}
// Set right button image
if (slide_count == slides.length - 1) {
if (document.images) {
document.images.rightb.src = rightb_off.src;
}
} else {
if (document.images) {
document.images.rightb.src = rightb_on.src;
}
}
parent.frames[0].document.open();
// Use appropriate linked style sheet for the document header
parent.frames[0].document.write(myHeader);
// store the caption in a var, write in appopriate table cell
// check for flag to display image file name
if (show_file) {
my_cap = '
\n');
if (cap_align == 1) {
parent.frames[0].document.write( '
' + my_cap + '
');
} else if (cap_align == 2) {
parent.frames[0].document.write( '
' + my_cap + '
');
}
// insert the current image here
if (iw>0 && ih>0) {
// resize has been issued to re-write slide with new image dimensions
parent.frames[0].document.write('
\n');
} else {
parent.frames[0].document.write('
\n');
}
if (cap_align == 3) {
parent.frames[0].document.write( '
' + my_cap + '
');
}
if (cap_align == 4) {
parent.frames[0].document.write( '
');
// Pre-load the next image by inserting it as a 1x1 image
// but only if the slide does not contain HTML content and we are not on the last slide
if (slide_count < (slides.length - 1) ) {
parent.frames[0].document.write('\n');
} else {
ready_state(1);
}
parent.frames[0].document.write('');
parent.frames[0].document.close();
// update the menu
document.control.gomenu.options.selectedIndex = slide_count;
}
}
}
//--------------------------------------------------------
// AUTOMATIC SLIDE SHOW
// Turns on or off the automatic advance of slides by
// activation of the checkbox on the jClicker
function autoShow() {
if (document.control.auto.checked) {
changeImage();
} else {
timerID = clearTimeout(timerID);
}
}
//--------------------------------------------------------
// AUTOMATIC SLIDE SHOW
// Controls autoadvance of slides by using Javascript timer
// functions
function changeImage() {
if (imgLoaded > 1) {
// all images are loaded
// increment the counter, check for loop at last slide
slide_count++;
if (slide_count == slides.length) {
slide_count = 1;
}
playSlide(0,0);
timerID=setTimeout('changeImage()',delay_time);
} else {
// images still loading, reset timer
timerID=setTimeout('changeImage()',1500);
}
}
//--------------------------------------------------------
// SETUP
// initializes variables for loading and reloading
function setUp() {
// check for starting at a desginated slide
if (show_start != 0) {
slide_count = show_start;
show_start = 0; // reset for next time around
playSlide(0,0);
} else {
// set the left button to the "off" graphic
if (document.images) {
document.images.leftb.src = leftb_off.src;
}
// reset the slide counter & menu selection
document.control.gomenu.options.selectedIndex = 0;
// rebuild the title page
parent.frames[0].document.open();
// use appropriate background colors
parent.frames[0].document.write(myHeader);
if (light_mode) {
parent.frames[0].document.write('
