Created
December 23, 2012 23:06
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jQuery.Deferredを使って非同期な繰り返し処理を行う
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/** | |
* [begin, end)の範囲で非同期的な繰り返し処理を行う | |
* | |
* @param {Object} options ループの設定 | |
* begin, end: 範囲指定 | |
* inc: まとめて実行する量 | |
* duration: ループごとに間をあける時間[ms] | |
* | |
* @return {jQuery.Deferred} | |
* progress: 非同期処理を行う部分 | |
* progress_func( index, deferred ) | |
* done: ループ正常終了時のコールバック設定 | |
* fail: ループを途中で抜けたときのコールバック設定 | |
*/ | |
function async_loop( options ) { | |
var deferred = jQuery.Deferred( ); | |
var index = options.begin; | |
function loop_func( ) { | |
var deferred_list = []; | |
for ( var i = 0; i < options.inc && index < options.end; ++i, ++index ) { | |
deferred_list.push( (function( ) { | |
var local = jQuery.Deferred( ); | |
deferred.notify( index, local ); | |
return local.promise( ); | |
})( ) ); | |
} | |
var deferred_when = jQuery.when.apply( null, deferred_list ); | |
deferred_when.done( function( ) { | |
if ( index < options.end ) { | |
setTimeout( loop_func, options.duration ); | |
} else { | |
deferred.resolve( ); | |
} | |
} ); | |
deferred_when.fail( function( ) { | |
deferred.reject( ); | |
} ); | |
} | |
setTimeout( loop_func, 0 ); | |
return deferred; | |
} | |
(function( ) { | |
var deferred = async_loop( { | |
begin : 0, | |
end : 20, | |
inc : 5, | |
duration : 1000 | |
} ); | |
deferred.progress( function( index, deferred ) { | |
console.log( index, 'start' ); | |
setTimeout( function( ) { | |
console.log( index, 'finish' ); | |
deferred.resolve( ); | |
}, 500 ); | |
} ); | |
deferred.always( function( ) { | |
console.log( 'finish' ); | |
} ); | |
})( ); |
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