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/**
* Javascript to add events to form elements
*
* $Horde: horde/js/form_helpers.js,v 1.3.4.6 2006/03/24 05:17:59 chuck Exp $
*
* Copyright 2004-2006 Matt Kynaston <matt@kynx.org>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*/
/**
* Adds the given event to an element. If the element already has
* script for the event, the new event is appended.
*
* @param object element The element to add the event to.
* @param string event The name of the event.
* @param string|function function The javascript to execute.
*/
function addEvent(element, event, code)
{
if (!element) {
return false;
}
// Assign new anonymous function if we're passed a js string
// instead of a function reference.
if (typeof code == 'string') {
code = new Function(code);
}
if (element.addEventListener) {
element.addEventListener(event.replace(/on/, ''), code, false);
} else if (element.attachEvent) {
element.attachEvent(event, code);
} else if (element.onload != null) {
var OldEvent = element[event];
newCode = Function(e)
{
oldEvent(e);
code();
};
element[event] = newCode;
} else {
element[event] = code;
}
return true;
}
/**
* Returns given value as a number, or zero if NaN.
*
* @param mixed val
*
* @return number
*/
function toNumber(val)
{
if (isNaN(val)) {
return 0;
} else {
return Number(val);
}
}
/**
* Sets the enabled state of one element based on the values of another.
*
* Takes four or more arguments, in the form:
* checkEnabled(source, target, true, value1, value2, value3...)
*
* @param object The element to check
* @param string The element to enable/disable
* @param boolean Whether to enable or disable the target
* @param mixed The value to check against
*/
function checkEnabled()
{
if (arguments.length > 2) {
objSrc = arguments[0];
objTarget = objSrc.form.elements[arguments[1]];
enabled = arguments[2];
toggle = false;
if (objTarget) {
switch (objSrc.type.toLowerCase()) {
case 'select-one' :
val = objSrc.options[objSrc.selectedIndex].value;
break;
case 'select-multiple' :
val = new Array();
count = 0;
for (var i = 0; i < objSrc.length; ++i) {
if (objSrc.options[i].selected) {
val[count] = objSrc.options[i].value;
}
}
break;
case 'checkbox' :
if (objSrc.checked) {
val = objSrc.value;
toggle = true;
}
break;
default :
val = objSrc.value;
}
for (var i = 3; i < arguments.length; ++i) {
if (typeof(val) == 'object' && (arguments[i] in val)) {
toggle = true;
break;
} else if (arguments[i] == val) {
toggle = true;
break;
}
}
objTarget.disabled = toggle ? !enabled : enabled;
if (!objTarget.disabled) {
objTarget.focus();
}
}
}
}
/**
* Sets the target field to the sum of a range of fields.
*
* Takes three or more arguments, in the form:
* sumFields(form, target, field1, field2, field3...)
*
* @param object The form to check
* @param string The name of the target element
* @param string One or more field names to sum
*/
function sumFields()
{
if (arguments.length > 2) {
objFrm = arguments[0];
objTarget = objFrm.elements[arguments[1]];
sum = 0;
if (objTarget) {
for (var i = 2; i < arguments.length; ++i) {
objSrc = objFrm.elements[arguments[i]];
if (objSrc) {
switch (objSrc.type.toLowerCase()) {
case 'select-one':
sum += toNumber(objSrc.options[objSrc.selectedIndex].value);
break;
case 'select-multiple' :
for (var j = 0; j < objSrc.length; ++j) {
sum += toNumber(objSrc.options[j].value);
}
break;
case 'checkbox' :
if (objSrc.checked) {
sum += toNumber(objSrc.value);
}
break;
default :
sum += toNumber(objSrc.value);
}
}
}
objTarget.value = sum;
}
}
}
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