TextArea.html
<html>
<head>
<script type="text/javascript" src="behaviour.js"></script>
<script type="text/javascript" src="textarea_maxlen.js"></script>
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-24837008-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</head>
<body>
<p>
Limit 120 Characters:
<TEXTAREA rows="5" cols="30" maxlength="120" showremain="limitOne">
</TEXTAREA> <br>
</p><p>Limit 50 Characters: <TEXTAREA rows="2" cols="30" maxlength="50" showremain="limitTwo"></TEXTAREA> </body>
</html>
Behaviour.js
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
Behaviour v1.1 by Ben Nolan, June 2005. Based largely on the work
of Simon Willison (see comments by Simon below).
Description:
Uses css selectors to apply javascript behaviours to enable
unobtrusive javascript in html documents.
Usage:
var myrules = {
'b.someclass' : function(element){
element.onclick = function(){
alert(this.innerHTML);
}
},
'#someid u' : function(element){
element.onmouseover = function(){
this.innerHTML = "BLAH!";
}
}
};
Behaviour.register(myrules);
// Call Behaviour.apply() to re-apply the rules (if you
// update the dom, etc).
License:
This file is entirely BSD licensed.
More information:
http://ripcord.co.nz/behaviour/
*/
var Behaviour = {
list : new Array,
register : function(sheet){
Behaviour.list.push(sheet);
},
start : function(){
Behaviour.addLoadEvent(function(){
Behaviour.apply();
});
},
apply : function(){
for (h=0;sheet=Behaviour.list[h];h++){
for (selector in sheet){
list = document.getElementsBySelector(selector);
if (!list){
continue;
}
for (i=0;element=list[i];i++){
sheet[selector](element);
}
}
}
},
addLoadEvent : function(func){
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
oldonload();
func();
}
}
}
}
Behaviour.start();
/*
The following code is Copyright (C) Simon Willison 2004.
document.getElementsBySelector(selector)
- returns an array of element objects from the current document
matching the CSS selector. Selectors can contain element names,
class names and ids and can be nested. For example:
elements = document.getElementsBySelect('div#main p a.external')
Will return an array of all 'a' elements with 'external' in their
class attribute that are contained inside 'p' elements that are
contained inside the 'div' element which has id="main"
New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
See http://www.w3.org/TR/css3-selectors/#attribute-selectors
Version 0.4 - Simon Willison, March 25th 2003
-- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-- Opera 7 fails
*/
function getAllChildren(e) {
// Returns all children of element. Workaround required for IE5/Windows. Ugh.
return e.all ? e.all : e.getElementsByTagName('*');
}
document.getElementsBySelector = function(selector) {
// Attempt to fail gracefully in lesser browsers
if (!document.getElementsByTagName) {
return new Array();
}
// Split selector in to tokens
var tokens = selector.split(' ');
var currentContext = new Array(document);
for (var i = 0; i < tokens.length; i++) {
token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
if (token.indexOf('#') > -1) {
// Token is an ID selector
var bits = token.split('#');
var tagName = bits[0];
var id = bits[1];
var element = document.getElementById(id);
if (tagName && element.nodeName.toLowerCase() != tagName) {
// tag with that ID not found, return false
return new Array();
}
// Set currentContext to contain just this element
currentContext = new Array(element);
continue; // Skip to next token
}
if (token.indexOf('.') > -1) {
// Token contains a class selector
var bits = token.split('.');
var tagName = bits[0];
var className = bits[1];
if (!tagName) {
tagName = '*';
}
// Get elements matching tag, filter them for class selector
var found = new Array;
var foundCount = 0;
for (var h = 0; h < currentContext.length; h++) {
var elements;
if (tagName == '*') {
elements = getAllChildren(currentContext[h]);
} else {
elements = currentContext[h].getElementsByTagName(tagName);
}
for (var j = 0; j < elements.length; j++) {
found[foundCount++] = elements[j];
}
}
currentContext = new Array;
var currentContextIndex = 0;
for (var k = 0; k < found.length; k++) {
if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
currentContext[currentContextIndex++] = found[k];
}
}
continue; // Skip to next token
}
// Code to deal with attribute selectors
if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
var tagName = RegExp.$1;
var attrName = RegExp.$2;
var attrOperator = RegExp.$3;
var attrValue = RegExp.$4;
if (!tagName) {
tagName = '*';
}
// Grab all of the tagName elements within current context
var found = new Array;
var foundCount = 0;
for (var h = 0; h < currentContext.length; h++) {
var elements;
if (tagName == '*') {
elements = getAllChildren(currentContext[h]);
} else {
elements = currentContext[h].getElementsByTagName(tagName);
}
for (var j = 0; j < elements.length; j++) {
found[foundCount++] = elements[j];
}
}
currentContext = new Array;
var currentContextIndex = 0;
var checkFunction; // This function will be used to filter the elements
switch (attrOperator) {
case '=': // Equality
checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
break;
case '~': // Match one of space seperated words
checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
break;
case '|': // Match start with value followed by optional hyphen
checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
break;
case '^': // Match starts with value
checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
break;
case '$': // Match ends with value - fails with "Warning" in Opera 7
checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
break;
case '*': // Match ends with value
checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
break;
default :
// Just test for existence of attribute
checkFunction = function(e) { return e.getAttribute(attrName); };
}
currentContext = new Array;
var currentContextIndex = 0;
for (var k = 0; k < found.length; k++) {
if (checkFunction(found[k])) {
currentContext[currentContextIndex++] = found[k];
}
}
// alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
continue; // Skip to next token
}
if (!currentContext[0]){
return;
}
// If we get here, token is JUST an element (not a class or ID selector)
tagName = token;
var found = new Array;
var foundCount = 0;
for (var h = 0; h < currentContext.length; h++) {
var elements = currentContext[h].getElementsByTagName(tagName);
for (var j = 0; j < elements.length; j++) {
found[foundCount++] = elements[j];
}
}
currentContext = found;
}
return currentContext;
}
/* That revolting regular expression explained
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/
\---/ \---/\-------------/ \-------/
| | | |
| | | The value
| | ~,|,^,$,* or =
| Attribute
Tag
*/
textarea_maxlength.js
var CSSrules = {
'textarea' : function(element){
element.onkeydown = function(event){
return doKeyPress(element,event);
}
,
element.onpaste = function(){
return doPaste(element);
}
,
element.onkeyup = function(){
return doKeyUp(element);
}
,
element.onblur = function(){
return doKeyUp(element);
}
}
}
Behaviour.register(CSSrules);
var detect = navigator.userAgent.toLowerCase();
// Keep user from entering more than maxLength characters
function doKeyPress(obj,evt){
maxLength = obj.getAttribute("maxlength");
var e = window.event ? event.keyCode : evt.which;
if ( (e == 32) || (e == 13) || (e > 47)) { //IE
if(maxLength && (obj.value.length > maxLength-1)) {
if (window.event) {
window.event.returnValue = null;
} else {
evt.cancelDefault;
return false;
}
}
}
}
function doKeyUp(obj){
maxLength = obj.getAttribute("maxlength");
if(maxLength && obj.value.length > maxLength){
obj.value = obj.value.substr(0,maxLength);
}
sr = obj.getAttribute("showremain");
if (sr) {
document.getElementById(sr).innerHTML = maxLength-obj.value.length;
}
}
// Cancel default behavior and create a new paste routine
function doPaste(obj){
maxLength = obj.getAttribute("maxlength");
if(maxLength){
if ((window.event) && (detect.indexOf("safari") + 1 == 0)) { //IE
var oTR = obj.document.selection.createRange();
var iInsertLength = maxLength - obj.value.length + oTR.text.length;
try {
var sData = window.clipboardData.getData("Text").substr(0,iInsertLength);
oTR.text = sData;
}
catch (err) {
}
if (window.event) { //IE
window.event.returnValue = null;
} else {
//not IE
obj.value = obj.value.substr(0,maxLength);
return false;
}
}
}
}
