dojo.data

dojo0.9的store核心内容。最近研究了一些，也翻译了一些，贴出来和大家分享。dojo的更多内容可以上： www.dojocn.cn 上查看。 一下内容是原创，转载请注明：

dojo.data 是什么?

dojo.data

DojoX

dojo.data

dojo.data

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dojo.data 术语

dojo.data

dojo:datastore

db:cursor

dojodb

dojodb

dojodb

dojodb

dojodb

dojodb

dojodb

internal data representation:

dojodb

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dojo.data 设计和编程接口

dojo.data.api.Read:

dojo.data.api.Write:

dojo.data.api.Identity:

dojo.data.api.Notification:

dojo.data.api.Schema

dojo.data.api.Attribution

dojo.data.api.Versioning

dojo.data.api.Derivation

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var store = new some.data.Store;

var items;

.......

////forvar i=0;i<items.length;i++{

var item=items[i];

console.log'For attribute 'foo' value was:['+store.getValueitem,'foo'+']';

}

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var value=item['foo'];

var value=item.foo;

var value=item.getValue'foo';

1item

2

3=======================================================================================

The Read API

Dojo.data l l n l n Iteml l l l l l l l itemitemlabelitemitem

1、var store = new some.Datastore;

var features = store.getFeatures;

forvar i in features{

console.log'Store supports feature: ' + i;

}

2、

var store = new some.Datastore;

ifstore.isItemsomeObject{

console.log'Object was an item.';

}else{

console.log'Object was NOT an item.';

}

3、

var store = new some.Datastore;

...

//Assume that someItem is an item we got from a load.

var attributes = store.getAttributessomeItem;

forvar i = 0; i < attributes.length; i++{

console.log'Item has attribute; ' + attributes[i];

}

4、

var store = new some.Datastore;

...

//Assume that someItem is an item we got from a load.

var attributes = store.getAttributessomeItem;

forvar i = 0; i < attributes.length; i++{

console.log'Item has attribute; ' + attributes[i];

}

5、

var store = new some.Datastore;

...

//Assume that someItem is an item we got from a load.

var label = store.getLabelsomeItem;

console.log'item has label: ' + label;

//itemlabelitemjsonlabel:”name” itemnameitemlabelgetLabelnamegetValueitem,”name”;

6store

var pantryStore = new dojo.data.JsonItemStore{url: 'pantry_items.json' } ;

//Define the onComplete callback to write COMPLETED to the page when the fetch has finished returning items.

var done = functionitems, request{

document.appendChilddocument.createTextNode'COMPLETED';

}

//Define the callback that appends a textnode into the document each time an item is returned.

gotItem = functionitem, request {

document.appendChilddocument.createTextNodepantryStore.getValueitem, 'name';

document.appendChilddocument.createElement'br';

}

//Define a simple error handler.

var gotError = functionerror, request{

alert'The request to the store failed. ' +error;

}

//Invoke the search

pantryStore.fetch{onComplete: done, onItem: gotItem, onError: gotError};

//onCompleteonItemonCompleteitemsnull,

6、

var pantryStore = new dojo.data.JsonItemStore{url: 'pantry_items.json' } ;

var pepperItem = pantryStore.getItemByIdentity'pepper';

if pepperItem !== null{

alert'Pepper is in aisle ' + pantryStore.getValuepepperItem,'aisle';

}

//json, identifier: 'name' itemname

7、

jsonItemStore.fetch{

queryOptions: {ignoreCase: true},//

query: { name: '*pepper*', aisle: 'Spices' }, //name aisle

onComplete:

...

};

8、

itemitemreferencegetValues

9、

var store = new dojo.data.JsonItemStore{url: 'pantryStore.json' };

var pageSize = 10;

var request = null;

var outOfItems = false;

var onNext = function{

if!outOfItems{

request.start += pageSize;

store.fetchrequest;

}

};

var onPrevious = function{

if request.start > 0{

request.start -= pageSize;

store.fetchrequest;

}

}

var itemsLoaded = functionitems, request{

if items.length < pageSize{

outOfItems = true;

}else{

outOfItems = false;

}

...

}

request = store.fetch{onComplete: itemsLoaded, start: 0; count: pageSize};

10、

var store = new dojo.data.JsonItemStore{url: 'pantryStore.json'};

var sortKeys = [

{attribute: 'aisle', descending: true},

{attribute: 'name', descending: false}

];

store.fetch{

sort: sortKeys;

onComplete:

...

};

//When onComplete is called, the array of items passed into it

//should be sorted according to the denoted sort array.

itemitem