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/**
* A random assortment of javascript utility routines
*
* @url $URL: http://cvs.mythtv.org/svn/branches/release-0-22-fixes/mythplugins/mythweb/js/utils.js $
* @date $Date: 2008-02-22 22:15:51 +0000 (Fri, 22 Feb 2008) $
* @version $Revision: 16207 $
* @author $Author: xris $
* @license LGPL
*
/**/
// For some reason, calling "value" from within onclick doesn't work
// Seems to be a name conflict somewhere, but I can't find it.
function set_field(id, val) {
value(id, val);
}
// Pass in value to change, otherwise it returns the value of the "e" element
function value(e, new_value) {
e = $(e);
if (!e)
return '';
// A <select>
if (e.options)
return value(e.options[e.selectedIndex]);
// Just an html element? (or in IE, an option element with no value="" specified)
else if (e.value == null || e.tagName.toLowerCase() == 'option' && e.value == '') {
if (new_value != null)
e.innerHTML = new_value;
return e.innerHTML;
}
// Form field
if (new_value != null)
e.value = new_value;
return e.value;
}
// Overwrite the href attribute of all <a> tags with a js_href attribute
Event.observe(window, 'load', add_js_attributes);
function add_js_attributes() {
// Get all links in this form
var links = $$('a');
for (var i=0; i<links.length; i++) {
// js_href
var js_href = links[i].getAttribute('js_href');
if (js_href && js_href.length)
links[i].href = js_href;
}
}
// Image Preloader
var img_on = new Array();
var img_off = new Array();
function preload_image(id, on, off) {
img_on[id] = new Image();
img_on[id].src = on;
if (off) {
img_off[id] = new Image();
img_off[id].src = off;
}
}
// Functions to swap on/off states of images
function on(which) {
var img = $(which);
img.src=img_on[which].src;
}
function off(which) {
var img = $(which);
img.src=img_off[which].src;
}
// Submit a form
function submit_form(newvar, val, form, confirm_str) {
// Confirm?
if (confirm_str && !confirm(confirm_str))
return;
// Find the form we want to submit
form = $(form ? form : 'form');
if (!form)
form = document.form ? document.form : document.forms[0];
// Create a new variable?
if (newvar) {
var hidden = document.createElement('input');
hidden.type = 'hidden';
hidden.name = newvar;
hidden.value = val != null ? val : 1;
form.appendChild(hidden);
}
// Submit
form.submit();
}
// Check/uncheck a checkbox
function toggle_checkbox(id, check) {
var e = $(id);
if (check)
e.checked = true;
else if (check != null)
e.checked = false;
else
e.checked = e.checked ? false : true;
}
// Change the help text
function help_text(text) {
// Set the text
$('help_text').innerHTML = text;
// Toggle the regions
$('help_text_default').toggle();
$('help_text').toggle();
}
// Return a time in hours and minutes
function nice_length(mylength, rx_hr, rx_hrs, rx_min, rx_mins) {
var mins = Math.round((mylength % 3600) / 60);
var hours = Math.round(mylength / 3600);
var ret;
if (hours) {
if (hours > 1)
ret = rx_hrs.replace(/\$1/, hours);
else
ret = rx_hr.replace(/\$1/, hours);
}
else
ret = '';
if (mins > 0) {
if (ret.length)
ret = ret + ' ';
if (mins > 1)
ret = ret + rx_mins.replace(/\$1/, mins);
else
ret = ret + rx_min.replace(/\$1/, mins);
}
return ret;
}
// Return a human-readable filesize
function nice_filesize(size) {
var kb = 1024; // Kilobyte
var mb = 1024 * kb; // Megabyte
var gb = 1024 * mb; // Gigabyte
var tb = 1024 * gb; // Terabyte
// If it's less than a kb we just return the size
if (size < kb)
return size + ' B';
// Otherwise we keep going until the size is in the appropriate measurement range.
else if (size < mb)
return Math.round(size/kb) + ' KB';
else if (size < gb)
return Math.round(size/mb) + ' MB';
else if (size < tb)
return Math.round(size/gb) + ' GB';
else
return Math.round(size/tb) + ' TB';
}
// The routines to allow a small ajax request counter...
var pending_ajax_requests = 0;
function ajax_add_request() {
pending_ajax_requests += 1;
$('ajax_num_requests').innerHTML = pending_ajax_requests;
$('ajax_working').removeClassName('hidden');
}
function ajax_remove_request() {
pending_ajax_requests -= 1;
$('ajax_num_requests').innerHTML = pending_ajax_requests;
if (pending_ajax_requests == 0)
$('ajax_working').addClassName('hidden');
}
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