General.js

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Contents

Set Tab Index - In the order of appearance 

var ho ='name,address,phone,city,state,zipcode';	
ho = ho.split(',')
for(i in ho)
{
   if(document.getElementsByName(ho[i])[0])
	document.getElementsByName(ho[i])[0].tabIndex = i+1
}

Reload Captcha 

function recaptcha(ref,url)
{
	document.getElementById(ref).src = url +  Math.floor(Math.random()*9000)+'/'	
}

Get Absolute position of an HTML Object 

function findAbsolutePosition(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		} while (obj = obj.offsetParent);
	}
	return [curleft,curtop];
//returns an array
}

Make key value pair for ajax post from html form - makeParam() 

function makeParam(param)
{
	var str = param.split(',')
	var val='';
	val += str[0] + '=' + str[1];
	for(var i=2;i<str.length;i+=2)
		val += "&" + str[i] + '=' + document.getElementById(str[i+1]).value
	return val;	
}

Trim text

In programming, trim is a string manipulation function or algorithm. The most popular variants of the trim function strip only the beginning or end of the string. Typically named ltrim and rtrim respectively.

This Javascript code trim implementation removes all leading and trailing occurrences of a set of characters specified. If no characters are specified it will trim whitespace characters from the beginning or end or both of the string.

Without the second parameter, Javascript function will trim these characters:

  • " " (ASCII 32 (0x20)), an ordinary space.
  • "\t" (ASCII 9 (0x09)), a tab.
  • "\n" (ASCII 10 (0x0A)), a new line (line feed).
  • "\r" (ASCII 13 (0x0D)), a carriage return.
  • "\0" (ASCII 0 (0x00)), the NUL-byte.
  • "\x0B" (ASCII 11 (0x0B)), a vertical tab.


You need to call trim('string') which will return the trimmed text. From FireFox 3.5 we have a built in trim function. 

function trim(str, chars) {

    return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
    chars = chars || "\\s";
    return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
    chars = chars || "\\s";
    return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

XMLHTTP object creation in a single line 

function createAjax()
{
return window.XMLHttpRequest ? new XMLHttpRequest() : ( window.ActiveXObject ? new window.ActiveXObject('Microsoft.XMLHTTP') : null)
}

Check Empty Objects 

function notEmpty(o){
    for (var prop in o) {
        if (o.hasOwnProperty(prop)) return true;
    }
    return false;
}

function isEmpty(o){
    for (var prop in o) {
        if (o.hasOwnProperty(prop)) return false;
    }
    return true;
}

Strip HTML Tags

This function is the php equivalent of the same name. Interesting... 

function strip_tags(str)
{
	var re= /<\S[^><]*>/g
	str = str.replace(re, "")
	return str;
}

Events

Get source element of an event 

function getEventSource(e) {
	var targ;
	if (!e) var e = window.event;
	if (e.target) targ = e.target;
	else if (e.srcElement) targ = e.srcElement;
	if (targ.nodeType == 3) // defeat Safari bug
		targ = targ.parentNode;
	return targ;
}

Key Code of keyboard event 


function getEventKeyCode(e) {
	var code;
	if (!e) var e = window.event;
	if (e.keyCode) code = e.keyCode;
	else if (e.which) code = e.which;
	var character = String.fromCharCode(code);
	alert('Character was ' + character);
}

Where is mouse, Get mouse position

Drag and Drop detailed

quirksmode.org is my handy site where i confirm most of my ideas. Often i flip its pages to upgrade myself because of browser compatibility. The drag and drop code was really nice. People should use it instead of using a framework. They can use frameworks but there might some times be clashes (overriding of objects) when using multiple frameworks like Jquery and mootools. So here is one good demonstration with which you can create your own drag and drop or customize by including jquery or another frameworks.

Validation 

var Validator = {
	isEmail : function(s) {
		return this.test(s, '^[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+@[-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\.[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$');
	},

	isAbsUrl : function(s) {
		return this.test(s, '^(news|telnet|nttp|file|http|ftp|https)://[-A-Za-z0-9\\.]+\\/?.*$');
	},

	isSize : function(s) {
		return this.test(s, '^[0-9]+(%|in|cm|mm|em|ex|pt|pc|px)?$');
	},

	isId : function(s) {
		return this.test(s, '^[A-Za-z_]([A-Za-z0-9_])*$');
	},

	isEmpty : function(s) {
		var nl, i;

		if (s.nodeName == 'SELECT' && s.selectedIndex < 1)
			return true;

		if (s.type == 'checkbox' && !s.checked)
			return true;

		if (s.type == 'radio') {
			for (i=0, nl = s.form.elements; i<nl.length; i++) {
				if (nl[i].type == "radio" && nl[i].name == s.name && nl[i].checked)
					return false;
			}

			return true;
		}

		return new RegExp('^\\s*$').test(s.nodeType == 1 ? s.value : s);
	},

	isNumber : function(s, d) {
		return !isNaN(s.nodeType == 1 ? s.value : s) && (!d || !this.test(s, '^-?[0-9]*\\.[0-9]*$'));
	},

	test : function(s, p) {
		s = s.nodeType == 1 ? s.value : s;

		return s == '' || new RegExp(p).test(s);
	}
};

Check Filename Extension 

function isnFile(filename)
{
	filename = document.getElementsByName(filename)[0].value
	if(filename=='')return true;
 
	if (!/(\.(jpg|jpeg|gif))$/i.test(filename))return true
	else return false;
}

Set Cookie and Get Cookie 

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+ ((expiredays==null) ? "" : ";expires="+exdate.toGMTString()) + "; path=/";
}
 
function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return null;
}

Round Decimal Number 

function roundNumber(number,decimal_points) {
	if(!decimal_points) return Math.round(number);
	if(number == 0) {
		var decimals = "";
		for(var i=0;i<decimal_points;i++) decimals += "0";
		return "0."+decimals;
	}
 
	var exponent = Math.pow(10,decimal_points);
	var num = Math.round((number * exponent)).toString();
	return num.slice(0,-1*decimal_points) + "." + num.slice(-1*decimal_points)
}
//roundNumber((p/100),2)

isbien and jaxerror 

function aresponse(jax)
{
	if(jax.responseText.indexOf('jaxtimeout')+1)
	{
		alert("Session time out. Please re-login");
		return;
	}
 
	if(isbien(jax.responseText))
	{
		if(arguments.length>1)
				alert(arguments[1])
			else alert('Updated Successfully');		
	}
	else 
	{
		if(arguments.length>2)
			alert(strip_tags(jax.responseText))
		else alert("Unable to process this request");
	}
}
 
function jaxerror(jax)
{ 
	if(arguments.length>1)
		alert(strip_tags(jax.responseText))
	else alert("Unable to process this request");
}

Ajax Timeout 

function jsTimeout(jax)
{
	jax = jax.responseText ? jax.responseText : jax;
	if(jax.indexOf('ajaxtimeout')+1){ alert("Session time out. Please re-login.");return true;}
	return false;
}
 
function isloggedout(jax)
{
	if(jax.responseText.indexOf('ajaxtimeout')+1)return true;
	return false;
}


Not Number 

function notnumber(nami,msg)
{
	if(isNaN(document.getElementById(nami).value))
		jsalert(msg,nami);		
}

Delete This 

function deleteThis(ref,box)
{
	var str;	
	str = ref		
	if(isNaN(ref))
	{	
		if(!isSelected(ref))
		{
			alert("Please select item(s) to delete");
			return;
		}	
		str = getSelected(ref)
		str = rtrim(str,',')		
	}
	if(!confirm("Are you sure you want to delete?"))return		
	request("id="+str,baseurl+"controller/delete/",0,0)
}

MakeParamEx 

function makeParamEx(str)
{
	str = str.split(',');
	var sri='';
	var nxt ='';
	var param ='';
	for(var i=0;i<str.length;i++)
	{
		sri = str[i].match(/^[a-z]+$/)
		if(sri)
		{
			param += '&'+sri;
			nxt = str[i+1].match(/^\[(.*)\]$/)
			if(nxt){ param += '=' + nxt[1]; i++; continue; }
			nxt = str[i+1].match(/\((.*)\)$/)
			if(nxt){ param += '=' + encodeURIComponent(window[nxt[1]]); i++; continue; }
			param += '=' + encodeURIComponent(getjsText(str[i+1]))
			i++;
			continue;
		}
		sri = str[i].match(/\/(.*)\//)
		if(sri)param += '&'+ sri[1] + '=' + encodeURIComponent(getjsText(sri[1]))
	}	
	param = param.replace(/^\&/,'')
	return param;
}
 
var param = makeParamEx('command,[save_seo],jaxpost,[1],/lang/,/sim/,/title/,/keywords/,/description/,/description/,/id/');


Set Values from JSON

The response from the server is an object which is one record set to be populated. I provide the input name and the key in the object. So input name will be populated with its equivalent key value in the object. 

// still experimenting
 
function setvalues(obj,str)
{
	str = str.split(',');
	var oye=''
	var tn=''
	for(var i=0;i<str.length;i+=2)
	{
		oye = document.getElementById(str[i])
		tn = oye.tagName.toLowerCase()
		if(tn=='select')
		{
			setjsSelectedText(str[i],obj[str[i+1]]);
			continue;
		}
 
		if(tn=='input')
		{
			if(oye.type=='text')
			{
//				alert(obj[str[i+1]])
				setvalue(str[i],obj[str[i+1]]);
				continue;
			}
		}
	}
}
// call: setvalues(so,'sfname,firstname,slname,lastname,saddress,address,scity,city,sstate,state,);

where first parameter is json and the rest are input names, key in the object

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