Helpful little snippets of code that I like to keep in my back pocket.

Image not found

Code that loads another image when the one you want can’t be found. I will tell you, this one takes a little while to work because the browser really wants to load the right image so it takes a little while before it will quit.

// hard
<img src="img.jpg" onError="imgFix(this)">
function imgFix(e){
	this.onerror=null;
	var src = $(e).attr('src');
	src = imgDir + src ;
	e.src = src;
}
// easy
<img src="img.jpg" onError="this.src='default.jpg'">

// hard

function imgFix(e){

this.onerror=null;

var src = $(e).attr('src');

src = imgDir + src ;

e.src = src;

}

// easy

Mobile Detection

Check to see if your site is on a mobile device. Sounds easy enough, right? Oh… I’m checking orientation too (landscape vs portrait)

<script>
$(function(){
	if( browser == "mobile" )
	{
		var h = $(window).height();
		var w = $(window).width();
		if(w<h){showMe()} else {hideMe()}
	}
});
$(window).on("orientationchange",function(){
  if( browser == "mobile" )
	{
	  	if(window.orientation != 0){ hideMe()
		}else {showMe()}
	}
}); 
function hideMe(){
	$(".hide").css({"visibility":"hidden"});
}
function showMe(){
	$(".hide").css({"visibility":"visible"});// Landscape
}
</script>

$(function(){

if( browser == "mobile" )

{

var h = $(window).height();

var w = $(window).width();

if(w<h){showMe()} else {hideMe()}

}

});

$(window).on("orientationchange",function(){

if( browser == "mobile" )

{

if(window.orientation != 0){ hideMe()

}else {showMe()}

}

});

function hideMe(){

$(".hide").css({"visibility":"hidden"});

}

function showMe(){

$(".hide").css({"visibility":"visible"});// Landscape

}

</script>

Load Page into DIV

Sometimes, you just want to load things into a DIV tag, without all that hub-bub. Here is how I do it.
OK, so I do it with an array, but I love arrays, and tend to sneak them into everything. I can’t help it.

// HTML
<div class="header">header</div>
<div class="body">sample</div>
<div class="footer">footer</div>
// JS
function newPage( goto ){
	var A = [];
// A[ PAGE, HEADER, FOOTER, BACK ];
	switch( goto ){
	// welcome screen
	case( 0 ):
	A.push(goto,'x','x',0);
	break;}
PAGE =(A[0]=='x')?'404.html': 'page_'+A[0]+'.html';
	// repeat for all sections
	$('.header').load( HEADER );
	$('.body').load( PAGE );
	$('.footer').load(FOOTER );
}

// HTML

<div class="header">header</div>

<div class="body">sample</div>

<div class="footer">footer</div>

// JS

function newPage( goto ){

var A = [];

// A[ PAGE, HEADER, FOOTER, BACK ];

switch( goto ){

// welcome screen

case( 0 ):

A.push(goto,'x','x',0);

break;}

PAGE =(A[0]=='x')?'404.html': 'page_'+A[0]+'.html';

// repeat for all sections

$('.header').load( HEADER );

$('.body').load( PAGE );

$('.footer').load(FOOTER );

}

Count Down to New Page

This is a little bit of code that I used for a demo, where I would play a gif for a few seconds before loading a page. I wanted a count down timer so that people knew they weren’t stuck watching a GIF forever.

// HTML
<img src="ani.gif" width="100%" height="100%">
<div class="timeRemains">
[ Movie Ends in <span id="number">7</span> Sec ]
</div>

// jQUERY
<script>
numCount = numNow = 5;
wait = numCount*1000;
$.wait = function(ms) {
	var defer = $.Deferred();
	kill = setTimeout(
		function(){defer.resolve();}
	,ms);
	return defer;
};
$.wait(numCount*1000).then(function(){
	clearTimeout(kill);
	// maybe load a new page, next?
});
function countDown(){
	if(numNow > 0){
	$.wait(1000).then(function(){
		numNow--;
		$('#number').html(numNow);
		countDown();
	});
	} 
}
countDown(); // start the crazy
</script>

// HTML

[ Movie Ends in <span id="number">7</span> Sec ]

</div>

// jQUERY

numCount = numNow = 5;

wait = numCount*1000;

$.wait = function(ms) {

var defer = $.Deferred();

kill = setTimeout(

function(){defer.resolve();}

,ms);

return defer;

};

$.wait(numCount*1000).then(function(){

clearTimeout(kill);

// maybe load a new page, next?

});

function countDown(){

if(numNow > 0){

$.wait(1000).then(function(){

numNow--;

$('#number').html(numNow);

countDown();

});

}

countDown(); // start the crazy

</script>

Re-formatting bad JSON

Google sent me some crap JSON like [{“cake:yummy,belt:tight,brown,leather,car:fast”}] it should look more like [{“cake”:”yummy”,”belt”:”tight,brown,leather”,”car”:”fast”}] even then, KnockOut.js wants it to look like: [{cake:”yummy”,belt:”tight,brown,leather”,car:”fast”}]… so this is how I fixed it.

// GOOGLE
googleKey = 'abc123';
googURL = 'https://spreadsheets.google.com/feeds/list/'+googleKey+'/od6/public/values?alt=json';

// Using JSONP
$.ajax({
    url: googURL,
    // the name of the callback parameter, as specified by the YQL service
    jsonp: "callback",
    // tell jQuery we're expecting JSONP
    dataType: "jsonp",
    // work with the response
    success: function( response ) {
		// http://evolt.org/regexp_in_javascript/	
		i=0;
		l=response['feed']['entry'].length;
		obj = "[";	
		
		for( i;i<l;i++ ){
			txt = response['feed']['entry'][i]['content']['$t'];
			txt = txt.split(':');
			j = txt.length;
			
			for( k=0;k<j;k++ ){
				
				if(k<j-1){
					txx = txt[k];
					xxx = txt[k].split(/\s+/).pop(); 
					if(k>0){
						txt[k] = txx.replace(xxx,'').trim().slice(0,-1)+'","'+xxx+'"';
					} else {
						txt[k] = '"'+xxx+'"';
					}
					txt[k] +=':"';
				}else{
					txt[k]+='"';
				};	
			}
			obj += '{ '+txt.join('')+' }';
			
			if(i<l-1){obj+=','}
		}
		obj +="]";
		jsonx = obj = $.parseJSON( obj );
		console.log( obj );
		
		ko.applyBindings(viewModel(jsonx));
    }
});

// GOOGLE

googleKey = 'abc123';

googURL = 'https://spreadsheets.google.com/feeds/list/'+googleKey+'/od6/public/values?alt=json';

// Using JSONP

$.ajax({

url: googURL,

// the name of the callback parameter, as specified by the YQL service

jsonp: "callback",

// tell jQuery we're expecting JSONP

dataType: "jsonp",

// work with the response

success: function( response ) {

// http://evolt.org/regexp_in_javascript/

i=0;

l=response['feed']['entry'].length;

obj = "[";

for( i;i<l;i++ ){

txt = response['feed']['entry'][i]['content']['$t'];

txt = txt.split(':');

j = txt.length;

for( k=0;k<j;k++ ){

if(k<j-1){

txx = txt[k];

xxx = txt[k].split(/\s+/).pop();

if(k>0){

txt[k] = txx.replace(xxx,'').trim().slice(0,-1)+'","'+xxx+'"';

} else {

txt[k] = '"'+xxx+'"';

}

txt[k] +=':"';

}else{

txt[k]+='"';

};

}

obj += '{ '+txt.join('')+' }';

if(i<l-1){obj+=','}

}

obj +="]";

jsonx = obj = $.parseJSON( obj );

console.log( obj );

ko.applyBindings(viewModel(jsonx));

}

});

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Malacology Tantalus Rationalism

"I bring screaming to the children." -DrPunchman

Image not found

Mobile Detection

Load Page into DIV

Count Down to New Page

Re-formatting bad JSON

DrPunchman

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