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jQuery.datalink.js
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jQuery.datalink.js
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/*
* jQuery live links plugin
* http://github.com/nje
*/
(function($){
var oldattr = $.attr,
oldval = $.fn.val,
olddata = $.data,
oldcleandata = $.cleanData,
linkId = 0,
liveLinks = {};
function attr( obj, name, value, pass ) {
// an attr that supports plain objects (won't look for .style, nodeType, etc)
return $.isPlainObject( obj )
? ( value === undefined ? obj[ name ] : ( obj[ name ] = value ) )
: oldattr( obj, name, value, pass );
}
function raiseEvents(type, context, change, setValue) {
// todo: peek if there are any listeners to avoid extra work
var ret,
event = $.Event( type + "Changing" ),
isArray = type === "array";
event.newValue = isArray ? change.arguments : change.newValue;
$.event.trigger( event, [ change ], context );
if (!event.isDefaultPrevented()) {
var newvalue = isArray ? change.arguments : event.newValue;
ret = setValue(newvalue);
var oldvalue = change.oldValue;
if ( isArray || typeof oldvalue === "undefined" || newvalue !== oldvalue ) {
isArray ? (change.arguments = newvalue) : (change.newValue = newvalue);
$.event.trigger( type + "Change", [ change ], context );
}
}
return ret;
}
$.attr = function( elem, name, value, pass ) {
var ret = this;
if (value === undefined)
ret = attr( elem, name, value, pass );
else {
raiseEvents( "attr", elem, { attrName: name, oldValue: attr( elem, name ), newValue: value },
function(newvalue) {
attr( elem, name, value, pass );
});
}
return ret;
}
$.fn.val = function( value ) {
var ret = this;
if ( value === undefined )
ret = oldval.call( this );
else {
this.each(function() {
var self = $(this);
raiseEvents( "attr", this, { attrName: "val", oldValue: oldval.call( self ), newValue: value },
function(newvalue) {
oldval.call( self, newvalue );
});
});
}
return ret;
}
$.data = function( elem, name, data ) {
var ret;
if ( typeof data === "undefined" ) {
ret = olddata( elem, name );
}
else {
var oldvalue,
newvalue = data,
attrName;
if ( typeof name === "object" ) {
attrName = "data:!";
newvalue = name;
}
else {
attrName = "data:" + name;
oldvalue = olddata( elem, name );
}
ret = raiseEvents( "attr", elem, { attrName: attrName, oldValue: oldvalue, newValue: newvalue },
function(newvalue) {
return olddata( elem, name, newvalue );
});
}
return ret;
}
$.cleanData = function( elems ) {
for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
if ( $.data( elem, "links" ) ) {
// remove any links that target this element
// as the source may not be being cleaned up
$.unlink( { target: elem } );
}
}
oldcleandata( elems );
}
$.each( "pop push reverse shift sort splice unshift".split(" "), function( i, name ) {
$[ name ] = function( arr ) {
var args = $.makeArray( arguments );
args.splice( 0, 1 );
return raiseEvents( "array", arr, { change: name, arguments: args }, function(arguments) {
arr[ name ].apply( arr, arguments );
});
}
});
var special = $.event.special,
formElems = /^(textarea|input|select)$/i;
$.each( "attrChanging attrChange arrayChanging arrayChange".split(' '), function( i, name ) {
var isattr = i < 2;
$.fn[ name ] = function(filter, fn) {
if ( arguments.length === 1 ) {
fn = filter;
filter = null;
}
return fn ? this.bind( name, filter, fn ) : this.trigger( name );
}
special[ name ] = {
add: function( handleObj ) {
var old_handler = handleObj.handler;
handleObj.handler = function( event, change ) {
var data = handleObj.data,
attrName = change ? (isattr ? change.attrName : change.change) : null;
if ( !change || !data || data === attrName || $.inArray( attrName, data ) > -1 ) {
$.extend( event, change );
// todo: support extra parameters passed to trigger as
// trigger('attrChange', [<change>, extra1, extra2]).
old_handler.call( this, event );
}
}
}
}
});
special.attrChange.teardown = function() { };
$(document).bind("change.attrChange", function(ev) {
var self = $(ev.target);
self.trigger( "attrChange", { attrName: "val", newValue: self.val() } );
});
var setter_lookup = {
val: "val",
html: "html",
text: "text"
}
function processFromTo( settings, context, fn ) {
var from = settings.from,
to = settings.to,
sources = from.sources || from.targets,
sourceAttrs = from.attr,
converts = from.convert,
targets = to.targets || to.sources,
targetAttrs = to.attr,
updates = to.update;
sources = $.isArray( sources ) ? sources : [sources];
targets = $.isArray( targets ) ? targets : [targets];
updates = typeof updates === "undefined" ? null : ($.isArray( updates ) ? updates : [updates]),
sourceAttrs = typeof sourceAttrs === "undefined" ? null : ($.isArray( sourceAttrs ) ? sourceAttrs : [sourceAttrs]),
targetAttrs = typeof targetAttrs === "undefined" ? null : ($.isArray( targetAttrs ) ? targetAttrs : [targetAttrs]),
converts = $.isArray( converts ) ? converts : [converts];
$.each(sources, function(i, source) {
var target = targets[ Math.min( targets.length - 1, i ) ],
sourceAttr = sourceAttrs ? sourceAttrs[ Math.min( sourceAttrs.length - 1, i ) ] : null,
targetAttr = targetAttrs ? targetAttrs[ Math.min( targetAttrs.length - 1, i ) ] : null,
convert = converts[ Math.min( converts.length - 1, i ) ],
update = updates ? updates[ Math.min( updates.length - 1, i ) ] : null;
fn({
source: source,
target: target,
sourceAttr: sourceAttr,
targetAttr: targetAttr,
convert: convert,
update: update
}, context);
});
if ( settings.twoWay ) {
var update = to.update;
delete to.update;
fn({ from: to, to: from }, context);
to.update = update;
}
}
function getValue(elem, attr) {
var value = ( attr && attr.indexOf( "data:" ) === 0 )
? elem.data( attr.substr( 5 ) )
: (attr === "val" ? elem.val() : elem.attr( attr ));
return value;
}
function setValue(sourceElem, targetElem, attr, value) {
var defaultAttr = sourceElem.attr( "itemprop" );
if ( !defaultAttr ) {
var e = sourceElem.get( 0 );
defaultAttr = e.name || e.id;
}
targetElem.each(function() {
var a = attr;
if ( !attr ) {
if ( this.nodeType ) {
// val for inputs, text for everything else
var nodeName = this.nodeName;
a = formElems.test( nodeName ) ? "val" : "text";
}
else {
a = defaultAttr;
}
}
var fn = setter_lookup[ a ];
if ( fn ) {
$(this)[ fn ]( value );
}
else if ( a.indexOf( "data:" ) === 0 ) {
$.data( this, a.substr( 5 ), value );
}
else {
$(this).attr( a, value );
}
});
}
$.linkLive = function( settings, context ) {
if ( settings.from && settings.to ) {
processFromTo( settings, context, $.linkLive );
return;
}
var source = settings.source,
target = settings.target,
sourceAttr = settings.sourceAttr || "",
targetAttr = settings.targetAttr || "",
convert = settings.convert;
// wrap arrays in another array because $([]) is treatment of
// the contents, not the array itself
source = $.isArray( source ) ? [ source ] : source;
target = $.isArray( target ) ? [ target ] : target;
var handler = function(ev, forceSource) {
var source = ev ? ev.target : forceSource;
var attr = sourceAttr;
if ( !attr ) {
// val for inputs, text for everything else
if ( source.nodeType ) {
var nodeName = source.nodeName;
attr = formElems.test( nodeName ) ? "val" : "text";
}
}
var _source = $(source),
newValue = ev ? ev.newValue : getValue( _source, attr ),
cv = convert ? ($.convertFn[ convert ] || convert) : null;
if ( cv ) {
newValue = cv( newValue, settings );
}
if ( typeof newValue !== "undefined" ) {
setValue( _source, $(target, context), targetAttr, newValue );
}
}
$(source, context).live( "attrChange", handler );
var list = liveLinks[ source ] || (liveLinks[ source ] = []);
list.push({
source: source,
sourceAttr: sourceAttr,
target: target,
targetAttr: targetAttr,
context: context,
handler: handler
});
if ( settings.update ) {
$(source).each(function() {
handler(null, this);
});
}
}
$.unlinkLive = function( settings, context ) {
if ( settings.from && settings.to ) {
processFromTo( settings, context, $.unlinkLive );
return;
}
var source = settings.source,
target = settings.target,
sourceAttr = settings.sourceAttr || "",
targetAttr = settings.targetAttr || "";
var links = liveLinks[ source ];
if ( links ) {
$.each(links, function(i, link) {
if (link.context === context && link.sourceAttr === sourceAttr && link.target === target && link.targetAttr === targetAttr) {
$(link.source, context).die("attrChange", link.handler);
delete links[ link.source ];
link.source = null;
link.target = null;
link.handler = null;
link.context = null;
return false;
}
});
}
}
$.link = function( settings, context ) {
if ( settings.from && settings.to ) {
processFromTo( settings, context, $.link );
return;
}
var source = settings.source,
target = settings.target,
sourceAttr = settings.sourceAttr || "",
targetAttr = settings.targetAttr || "",
convert = settings.convert;
// wrap arrays in another array because $([]) is treatment of
// the contents, not the array itself
source = $($.isArray( source ) ? [ source ] : source, context);
target = $($.isArray( target ) ? [ target ] : target, context);
target.each(function(i, target) {
var _target = $(target);
source.each(function(i, source) {
var attr = sourceAttr;
if ( !attr ) {
// val for inputs, text for everything else
if ( this.nodeType ) {
var nodeName = this.nodeName;
attr = formElems.test( nodeName ) ? "val" : "text";
}
}
var handler = function(ev) {
if ( !ev || source === ev.target ) {
var _source = $(ev ? ev.target : source),
newValue = ev ? ev.newValue : getValue( _source, attr ),
// re-evaluate convert each occurrance to pick up dynamic changes to convertFn
cv = convert ? ($.convertFn[ convert ] || convert) : null;
if ( cv ) {
newValue = cv( newValue, settings );
}
if ( typeof newValue !== "undefined" ) {
setValue( _source, _target, targetAttr, newValue );
}
}
};
var id = linkId++,
link = {
source: source,
sourceAttr: sourceAttr,
target: target,
targetAttr: targetAttr,
handler: handler,
id: id
};
// register this link with the target
var data = $.data( target ),
links = data.links || (data.links = { targets: {}, sources: {} }),
index = links.targets;
index[ id ] = link;
// register this link with the source
data = $.data( source );
links = data.links || (data.links = { targets: {}, sources: {} });
index = links.sources;
index[ id ] = link;
// listen to changes on the source
$(source).attrChange( attr ? attr.split( ' ' ) : '', handler );
// update if specified
if ( settings.update ) {
handler();
}
});
});
}
/*
Links are individually remembered via data() in order to facilitate
removing them individually. For example, you might all at once link
a single source to several targets, then remove the linking to one of
the targets.
Each link object looks like this:
link = { source: source, sourceAttr: sourceAttr,
target: target, targetAttr: targetAttr,
handler: handler }
And they are indexed per element like this:
elem.data.links = {
// index of links that have this element as the source
sources: {
linkId1: link1,
linkId2: link2,
...
},
// index of links that have this element as the target
targets: {
linkId1: link1,
linkId2: link2,
...
}
}
The links are stored by a unique link id rather than array
in order to make removing them upon unlinking faster.
'Live' links are not associated with any dom elements for obvious reasons.
A private dictionary is kept for them, indexed by the source selector.
var liveLinks = {
source1: [link1, link2, ...],
source2: [link1, link2, ...],
...
}
*/
function getLinksFor(obj, attr, isSource) {
var links = $.data( obj, "links" ),
index = links ? (links[ isSource ? "sources" : "targets" ]) : null;
if ( !index ) {
return {};
}
else if ( attr ) {
var matched = {};
$.each(index, function(linkId, link) {
if ( link[ isSource ? "sourceAttr" : "targetAttr" ] === attr ) {
matched[ linkId ] = link;
}
});
index = matched;
}
return index;
}
function filterBy(links, obj, objAttr, isSource) {
var matched = {},
objField = isSource ? "source" : "target",
objAttrField = isSource ? "sourceAttr" : "targetAttr";
$.each(links, function(linkId, link) {
if ( link[objField] === obj && ( !objAttr || link[objAttrField] === objAttr ) ) {
matched[ linkId ] = link;
}
});
return matched;
}
function getLinks( source, sourceAttr, target, targetAttr ) {
var matched;
if ( source ) {
matched = getLinksFor( source, sourceAttr, true );
if ( target ) {
// filter by target
matched = filterBy( matched, target, targetAttr );
}
}
else if ( target ) {
matched = getLinksFor( target, targetAttr );
if ( source ) {
// filter by source
matched = filterBy( matched, source, sourceAttr, true );
}
}
else {
matched = {};
}
return matched;
}
function unlink( link ) {
// unbind handler
$( link.source ).unbind( "attrChange", link.handler );
// remove link from sources and targets list in each side's data cache
var links = $.data( link.source, "links" );
delete links.sources[ link.id ];
links = $.data( link.target, "links");
delete links.targets[ link.id ];
// remove references to help ensure no circular references
link.source = null;
link.target = null;
link.handler = null;
}
$.unlink = function( settings, context ) {
if ( settings.from && settings.to ) {
processFromTo( settings, context, $.unlink );
return;
}
var source = settings.source,
target = settings.target,
sourceAttr = settings.sourceAttr || "",
targetAttr = settings.targetAttr || "";
source = source ? $($.isArray( source ) ? [ source ] : source, context) : null;
target = target ? $($.isArray( target ) ? [ target ] : target, context) : null;
function remove(source, target) {
var links = getLinks( source, sourceAttr, target, targetAttr );
$.each(links, function(linkId, link) {
unlink( link );
});
}
if ( source && target ) {
source.each(function(i, source) {
target.each(function(i, target) {
remove( source, target );
});
});
}
else if ( source ) {
source.each(function(i, source) {
remove( source );
});
}
else if ( target ) {
target.each(function(i, target) {
remove( null, target );
});
}
}
$.convertFn = {
"!": function(value) {
return !value;
}
};
})(jQuery);