/* www.gibney.org entry nr. 214: PersistentFormdata */

/* www.gibney.org PersistentFormdata */

// <script src="http://javascript.en.gibney.org/saveform.js" type="text/javascript"></script>
// <textarea class="code_area">

/*
Script by Gibney-Enterprises

include this script in a HTML-Page with a Form.
Fill the form and press ctrl+shift+p to get a url for the current page with your values in input-fields and textareas

*/



ge_persistentFormdata_forms=Array();

function ge_persistentFormdata_KeyPress(e)
{
	var code;
	
	if (!e) e = window.event;
	
	if (e.which)
	{
		code=e.which;
	}
	else
	{
		code=e.keyCode;
	}
	if (e.ctrlKey && e.shiftKey)
	{
		if(code==80) // 80=p as persistent
		{
			ge_persistentFormdata_MakePersistent()
			e.preventDefault();
		}
	}
}

function isInArray(array, value)
{
 for (var i=0; i<array.length; i++) if(array[i]==value) return true;

 return false;
}

function ge_persistentFormdata_MakePersistent()
{
	var parameters='';
        if(ge_persistentFormdata_forms.length==0) ge_persistentFormdata_forms=document.forms;
	for (var f=0; f<document.forms.length; f++)
	{
                var form=document.forms[f];
                if(!isInArray(ge_persistentFormdata_forms, form)) continue;
		var elementcount=form.elements.length;
		for (var e=0; e<elementcount; e++)
		{
			if (form.elements[e].name=='') continue;
			
			if (parameters.length>0) parameters+='&';
			// parameters+=form.elements[e].name;
			parameters+='gePF_'+f+'_'+e;
			parameters+='=';
			parameters+=encodeURIComponent(form.elements[e].value);
		}
	}
	window.location.hash=encodeURIComponent(parameters);
}

// 06.20.2010:
// code to detect and read the legacy format using query-strings. 
// alerts the user, that an old URL was decoded and he should bookmark
// the form again.
// to be removed some day...
function ge_persistentFormdata_LegacyCheck()
{
	if (window.location.search.length>0)
	{
		var parameters=window.location.search.substr(1).split('&');
		for (var p=0; p<parameters.length; p++)
		{
			if (parameters[p].substr(0,5)=='gePF_') return true;
		}		
	}	
	return false;
}

function ge_persistentFormdata_RestoreLegacy()
{
	if (window.location.search.length>0)
	{
		parameters=window.location.search.substr(1).split('&');
		parametercount=parameters.length;
		for (var p=0; p<parametercount; p++)
		{
			var temp=parameters[p].split('=');
			if (temp[0].substr(0,5)!='gePF_') continue; // this i not a persistentForm-Field
			
			var name=temp[0];
			var value=unescape(temp[1]);
			temp=name.split('_');

			document.forms[temp[1]].elements[temp[2]].value=value;
		}
		
	}
}

function ge_persistentFormdata_Restore()
{
	if(ge_persistentFormdata_LegacyCheck())
	{
		ge_persistentFormdata_RestoreLegacy();
		ge_persistentFormdata_MakePersistent();
		alert('This URL contains an outdated persistentformdata-Format. Please remove the old query string from the URL and bookmark this page again, then remove the old bookmark.');
	}

	if (window.location.hash.length>0)
	{
		var parameters=window.location.hash
			.substr(1)            // remove #
			.replace(/%s/g,'%25s') // validate URL if Firefox placeholde %s is used
			.split('&');          // split to single parameters
		var parametercount=parameters.length;
		for (var p=0; p<parametercount; p++)
		{
			var temp=parameters[p].split('=');
			if (temp[0].substr(0,5)!='gePF_') continue; // this i not a persistentForm-Field
			
			var name=temp[0];
			var value=decodeURIComponent(temp[1]);
			temp=name.split('_');

			document.forms[temp[1]].elements[temp[2]].value=value;
		}		
	}
}


document.addEventListener('keydown'   ,ge_persistentFormdata_KeyPress,false);
window  .addEventListener('load'      ,ge_persistentFormdata_Restore ,false);
window  .addEventListener('hashchange',ge_persistentFormdata_Restore ,false);
//