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refactor jsonp.js for size and clarity

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This commit is contained in:
Richard Gibson 2012-04-22 11:36:44 -04:00
parent d3b61de520
commit b0ea80e9fd
1 changed files with 56 additions and 52 deletions
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108
src/ajax/jsonp.js
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@ -1,14 +1,15 @@
(function( jQuery ) {
var jsc = jQuery.now(),
jsre = /(\=)\?(&|$)|\?\?/i,
jscallbacks = [];
var oldCallbacks = [],
rquestion = /\?/,
rjsonp = /(=)\?(?=&|$)|\?\?/,
nonce = jQuery.now();
// Default jsonp settings
jQuery.ajaxSetup({
jsonp: "callback",
jsonpCallback: function() {
var callback = jscallbacks.pop() || ( jQuery.expando + "_" + ( jsc++ ) );
var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( nonce++ ) );
this[ callback ] = true;
return callback;
}
@ -17,62 +18,38 @@ jQuery.ajaxSetup({
// Detect, normalize options and install callbacks for jsonp requests
jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {
var inspectData = ( typeof s.data === "string" ) && /^application\/x\-www\-form\-urlencoded/.test( s.contentType );
var callbackName, overwritten, responseContainer,
data = s.data,
url = s.url,
hasCallback = s.jsonp !== false,
replaceInUrl = hasCallback && rjsonp.test( url ),
replaceInData = hasCallback && typeof data === "string" &&
!( s.contentType || "" ).indexOf("application/x-www-form-urlencoded") &&
rjsonp.test( data );
if ( s.dataTypes[ 0 ] === "jsonp" ||
s.jsonp !== false && ( jsre.test( s.url ) ||
inspectData && jsre.test( s.data ) ) ) {
// Handle iff the expected data type is "jsonp" or we have a parameter to set
if ( s.dataTypes[ 0 ] === "jsonp" || hasCallback &&
( replaceInUrl || replaceInData ) ) {
var responseContainer,
jsonpCallback = s.jsonpCallback =
jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
previous = window[ jsonpCallback ],
url = s.url,
data = s.data,
replace = "$1" + jsonpCallback + "$2";
// Get callback name, remembering preexisting value associated with it
callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ?
s.jsonpCallback() :
s.jsonpCallback;
overwritten = window[ callbackName ];
if ( s.jsonp !== false ) {
url = url.replace( jsre, replace );
if ( s.url === url ) {
if ( inspectData ) {
data = data.replace( jsre, replace );
}
if ( s.data === data ) {
// Add callback manually
url += (/\?/.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
}
}
// Insert callback into url or form data
if ( replaceInUrl ) {
s.url = url.replace( rjsonp, "$1" + callbackName );
} else if ( replaceInData ) {
s.data = data.replace( rjsonp,"$1" + callbackName );
} else if ( hasCallback ) {
s.url += ( rquestion.test( url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName;
}
s.url = url;
s.data = data;
// Install callback
window[ jsonpCallback ] = function( response ) {
responseContainer = [ response ];
};
// Clean-up function
jqXHR.always(function() {
// Set callback back to previous value
window[ jsonpCallback ] = previous;
// Save back as free
if ( s[ jsonpCallback ] ) {
// make sure that re-using the options doesn't screw things around
s.jsonpCallback = originalSettings.jsonpCallback;
// save the callback name for future use
jscallbacks.push( jsonpCallback );
}
// Call if it was a function and we have a response
if ( responseContainer && jQuery.isFunction( previous ) ) {
window[ jsonpCallback ]( responseContainer[ 0 ] );
}
});
// Use data converter to retrieve json after script execution
s.converters["script json"] = function() {
if ( !responseContainer ) {
jQuery.error( jsonpCallback + " was not called" );
jQuery.error( callbackName + " was not called" );
}
return responseContainer[ 0 ];
};
@ -80,6 +57,33 @@ jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {
// force json dataType
s.dataTypes[ 0 ] = "json";
// Install callback
window[ callbackName ] = function() {
responseContainer = arguments;
};
// Clean-up function (fires after converters)
jqXHR.always(function() {
// Restore preexisting value
window[ callbackName ] = overwritten;
// Save back as free
if ( s[ callbackName ] ) {
// make sure that re-using the options doesn't screw things around
s.jsonpCallback = originalSettings.jsonpCallback;
// save the callback name for future use
oldCallbacks.push( callbackName );
}
// Call if it was a function and we have a response
if ( responseContainer && jQuery.isFunction( overwritten ) ) {
overwritten( responseContainer[ 0 ] );
}
responseContainer = overwritten = undefined;
});
// Delegate to script
return "script";
}