An ugly POC for decoupled 'binding' in Javascript
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var DomWriter = function (target, namespace) { | |
var instance = this; | |
var template = namespace; | |
var coalesce = function( value, defaultValue ) { | |
return typeof(value) != 'undefined' ? | |
value : defaultValue; | |
}; | |
this.isObject = function( value ) { | |
return typeof(value) === 'object'; | |
}; | |
this.addSubscription = function( path, element ) { | |
postal.subscribe( "binding", path, function( msg ) { | |
instance.write( path, msg ); | |
}); | |
if( _(instance[path]).isUndefined() ) { | |
instance[path] = element; | |
} | |
}; | |
this.crawl = function( namespace, element, callback ) { | |
_(element) | |
.chain() | |
.keys() | |
.each( function( key ) { | |
var child = element[key]; | |
var fqn = namespace === "" ? | |
key : namespace + "." + key; | |
callback( namespace, key, child ); | |
if( !_.isNull( child ) && instance.isObject( child ) ) { | |
instance.crawl( fqn, child, callback ); | |
} | |
}); | |
}; | |
this.domCrawl = function( namespace, element, callback ) { | |
var id = coalesce( element["id"], "" ); | |
var fqn = namespace == "" ? | |
id : ( id === "" ? namespace : namespace + "." + id ); | |
callback( fqn, id, element ); | |
if( element.children !== undefined && | |
element.children.length > 0 ) { | |
_(element.children) | |
.chain() | |
.each( function( child ) { | |
instance.domCrawl( | |
fqn, | |
child, | |
callback ); | |
}); | |
} | |
}; | |
this.domCrawl( "", target[0], function( namespace, key, child ) { | |
var prefix = template + "."; | |
var member = namespace === template ? | |
namespace : namespace.replace( prefix, "", "gi"); | |
instance.addSubscription( member, child ); | |
}); | |
this.write = function( path, value ) { | |
element = this[path]; | |
this[$(element)[0].tagName.toLowerCase()] | |
( path, element, value ); | |
}; | |
this.div = function( fqn, element, value ) { | |
if( instance.isObject( value ) ) { | |
instance.crawl( "", value, function( namespace, key, child ) { | |
instance.write( | |
namespace === "" ? key : namespace + "." + key, | |
child ); | |
}); | |
} | |
else { | |
$(element).text( value ); | |
} | |
}; | |
this.span = function( fqn, element, value ) { | |
$(element).text( value ); | |
}; | |
this.input = function( fqn, element, value ) { | |
$(element).val( value ); | |
}; | |
this.ul = function( fqn, element, value ) { | |
var children = $(element).children("li"); | |
if( children.length < value.length ) { | |
$(element).empty(); | |
var li = children[0]; | |
var indx = 0; | |
_(value) | |
.each( function( child ) { | |
var newLi = $(li) | |
.clone() | |
.attr( "id", indx ) | |
.appendTo( element ); | |
instance[ fqn + "." + indx ] = newLi[0]; | |
instance.domCrawl( | |
fqn, | |
newLi[0], | |
function( namespace, key, child ) { | |
var prefix = template + "."; | |
var member = namespace === template ? | |
namespace : namespace.replace( prefix, "", "gi"); | |
instance.addSubscription( member, child ); | |
} | |
); | |
indx++; | |
}); | |
} | |
}; | |
this.li = function( fqn, element, value ) { | |
$(element).text( value ); | |
}; | |
}; |
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<html> | |
<head> | |
<script src="/scripts/binder.js" type="text/javascript"></script> | |
<script src="/scripts/underscore-min.js" type="text/javascript"></script> | |
<script src="/scripts/jquery-1.6.2.min.js" | |
type="text/javascript"></script> | |
<script src="/scripts/postal.js" type="text/javascript"></script> | |
<script type="text/javascript" language="javascript"> | |
var alex = | |
{ | |
"firstname" : "Alex ", | |
"lastname" : "Robson", | |
"hobbies" : | |
[ | |
"CODE ALL THE THINGS", | |
"Watching my stories", | |
"Reading" | |
], | |
"relatives": | |
[ | |
{"firstname" : "Ian", "lastname" : "Robson" }, | |
{"firstname" : "Sean", "lastname" : "Robson" }, | |
] | |
}; | |
$(function() { | |
var writer = new DomWriter($("#person"), "person"); | |
writer.write( "person", alex ); | |
postal.publish( "binding", "hobbies.0", "Taking big dumps." ); | |
}); | |
</script> | |
</head> | |
<body> | |
<div id="person"> | |
<!--<span id="firstname"></span>--> | |
<!--<span id="lastname"></span>--> | |
<input type="text" id="firstname" /> | |
<input type="text" id="lastname" /> | |
<ul id="hobbies"> | |
<li></li> | |
</ul> | |
<ul id="relatives"> | |
<li> | |
<span id="firstname"></span> | |
<span id="lastname"></span> | |
</li> | |
</ul> | |
</div> | |
</body> | |
</html> |
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