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-if(!dojo._hasResource["dojox.data.QueryReadStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
-dojo._hasResource["dojox.data.QueryReadStore"] = true;
-dojo.provide("dojox.data.QueryReadStore");
-
-dojo.require("dojo.string");
-
-dojo.declare("dojox.data.QueryReadStore",
- null,
- {
- // summary:
- // This class provides a store that is mainly intended to be used
- // for loading data dynamically from the server, used i.e. for
- // retreiving chunks of data from huge data stores on the server (by server-side filtering!).
- // Upon calling the fetch() method of this store the data are requested from
- // the server if they are not yet loaded for paging (or cached).
- //
- // For example used for a combobox which works on lots of data. It
- // can be used to retreive the data partially upon entering the
- // letters "ac" it returns only items like "action", "acting", etc.
- //
- // note:
- // The field name "id" in a query is reserved for looking up data
- // by id. This is necessary as before the first fetch, the store
- // has no way of knowing which field the server will declare as
- // identifier.
- //
- // examples:
- // | // The parameter "query" contains the data that are sent to the server.
- // | var store = new dojox.data.QueryReadStore({url:'/search.php'});
- // | store.fetch({query:{name:'a'}, queryOptions:{ignoreCase:false}});
- //
- // | // Since "serverQuery" is given, it overrules and those data are
- // | // sent to the server.
- // | var store = new dojox.data.QueryReadStore({url:'/search.php'});
- // | store.fetch({serverQuery:{name:'a'}, queryOptions:{ignoreCase:false}});
- //
- // | <div dojoType="dojox.data.QueryReadStore"
- // | jsId="store2"
- // | url="../tests/stores/QueryReadStore.php"
- // | requestMethod="post"></div>
- // | <div dojoType="dojox.grid.data.DojoData"
- // | jsId="model2"
- // | store="store2"
- // | sortFields="[{attribute: 'name', descending: true}]"
- // | rowsPerPage="30"></div>
- // | <div dojoType="dojox.Grid" id="grid2"
- // | model="model2"
- // | structure="gridLayout"
- // | style="height:300px; width:800px;"></div>
-
- //
- // todo:
- // - there is a bug in the paging, when i set start:2, count:5 after an initial fetch() and doClientPaging:true
- // it returns 6 elemetns, though count=5, try it in QueryReadStore.html
- // - add optional caching
- // - when the first query searched for "a" and the next for a subset of
- // the first, i.e. "ab" then we actually dont need a server request, if
- // we have client paging, we just need to filter the items we already have
- // that might also be tooo much logic
-
- url:"",
- requestMethod:"get",
- //useCache:false,
-
- // We use the name in the errors, once the name is fixed hardcode it, may be.
- _className:"dojox.data.QueryReadStore",
-
- // This will contain the items we have loaded from the server.
- // The contents of this array is optimized to satisfy all read-api requirements
- // and for using lesser storage, so the keys and their content need some explaination:
- // this._items[0].i - the item itself
- // this._items[0].r - a reference to the store, so we can identify the item
- // securly. We set this reference right after receiving the item from the
- // server.
- _items:[],
-
- // Store the last query that triggered xhr request to the server.
- // So we can compare if the request changed and if we shall reload
- // (this also depends on other factors, such as is caching used, etc).
- _lastServerQuery:null,
-
-
- // Store a hash of the last server request. Actually I introduced this
- // for testing, so I can check if no unnecessary requests were issued for
- // client-side-paging.
- lastRequestHash:null,
-
- // summary:
- // By default every request for paging is sent to the server.
- doClientPaging:false,
-
- // summary:
- // By default all the sorting is done serverside before the data is returned
- // which is the proper place to be doing it for really large datasets.
- doClientSorting:false,
-
- // Items by identify for Identify API
- _itemsByIdentity:null,
-
- // Identifier used
- _identifier:null,
-
- _features: {'dojo.data.api.Read':true, 'dojo.data.api.Identity':true},
-
- _labelAttr: "label",
-
- constructor: function(/* Object */ params){
- dojo.mixin(this,params);
- },
-
- getValue: function(/* item */ item, /* attribute-name-string */ attribute, /* value? */ defaultValue){
- // According to the Read API comments in getValue() and exception is
- // thrown when an item is not an item or the attribute not a string!
- this._assertIsItem(item);
- if (!dojo.isString(attribute)) {
- throw new Error(this._className+".getValue(): Invalid attribute, string expected!");
- }
- if(!this.hasAttribute(item, attribute)){
- // read api says: return defaultValue "only if *item* does not have a value for *attribute*."
- // Is this the case here? The attribute doesn't exist, but a defaultValue, sounds reasonable.
- if(defaultValue){
- return defaultValue;
- }
- console.log(this._className+".getValue(): Item does not have the attribute '"+attribute+"'.");
- }
- return item.i[attribute];
- },
-
- getValues: function(/* item */ item, /* attribute-name-string */ attribute){
- this._assertIsItem(item);
- var ret = [];
- if(this.hasAttribute(item, attribute)){
- ret.push(item.i[attribute]);
- }
- return ret;
- },
-
- getAttributes: function(/* item */ item){
- this._assertIsItem(item);
- var ret = [];
- for(var i in item.i){
- ret.push(i);
- }
- return ret;
- },
-
- hasAttribute: function(/* item */ item, /* attribute-name-string */ attribute) {
- // summary:
- // See dojo.data.api.Read.hasAttribute()
- return this.isItem(item) && typeof item.i[attribute]!="undefined";
- },
-
- containsValue: function(/* item */ item, /* attribute-name-string */ attribute, /* anything */ value){
- var values = this.getValues(item, attribute);
- var len = values.length;
- for(var i=0; i<len; i++){
- if(values[i]==value){
- return true;
- }
- }
- return false;
- },
-
- isItem: function(/* anything */ something){
- // Some basic tests, that are quick and easy to do here.
- // >>> var store = new dojox.data.QueryReadStore({});
- // >>> store.isItem("");
- // false
- //
- // >>> var store = new dojox.data.QueryReadStore({});
- // >>> store.isItem({});
- // false
- //
- // >>> var store = new dojox.data.QueryReadStore({});
- // >>> store.isItem(0);
- // false
- //
- // >>> var store = new dojox.data.QueryReadStore({});
- // >>> store.isItem({name:"me", label:"me too"});
- // false
- //
- if(something){
- return typeof something.r!="undefined" && something.r==this;
- }
- return false;
- },
-
- isItemLoaded: function(/* anything */ something) {
- // Currently we dont have any state that tells if an item is loaded or not
- // if the item exists its also loaded.
- // This might change when we start working with refs inside items ...
- return this.isItem(something);
- },
-
- loadItem: function(/* object */ args){
- if(this.isItemLoaded(args.item)){
- return;
- }
- // Actually we have nothing to do here, or at least I dont know what to do here ...
- },
-
- fetch:function(/* Object? */ request){
- // summary:
- // See dojo.data.util.simpleFetch.fetch() this is just a copy and I adjusted
- // only the paging, since it happens on the server if doClientPaging is
- // false, thx to http://trac.dojotoolkit.org/ticket/4761 reporting this.
- // Would be nice to be able to use simpleFetch() to reduce copied code,
- // but i dont know how yet. Ideas please!
- request = request || {};
- if(!request.store){
- request.store = this;
- }
- var self = this;
-
- var _errorHandler = function(errorData, requestObject){
- if(requestObject.onError){
- var scope = requestObject.scope || dojo.global;
- requestObject.onError.call(scope, errorData, requestObject);
- }
- };
-
- var _fetchHandler = function(items, requestObject, numRows){
- var oldAbortFunction = requestObject.abort || null;
- var aborted = false;
-
- var startIndex = requestObject.start?requestObject.start:0;
- if (self.doClientPaging==false) {
- // For client paging we dont need no slicing of the result.
- startIndex = 0;
- }
- var endIndex = requestObject.count?(startIndex + requestObject.count):items.length;
-
- requestObject.abort = function(){
- aborted = true;
- if(oldAbortFunction){
- oldAbortFunction.call(requestObject);
- }
- };
-
- var scope = requestObject.scope || dojo.global;
- if(!requestObject.store){
- requestObject.store = self;
- }
- if(requestObject.onBegin){
- requestObject.onBegin.call(scope, numRows, requestObject);
- }
- if(requestObject.sort && this.doClientSorting){
- items.sort(dojo.data.util.sorter.createSortFunction(requestObject.sort, self));
- }
- if(requestObject.onItem){
- for(var i = startIndex; (i < items.length) && (i < endIndex); ++i){
- var item = items[i];
- if(!aborted){
- requestObject.onItem.call(scope, item, requestObject);
- }
- }
- }
- if(requestObject.onComplete && !aborted){
- var subset = null;
- if (!requestObject.onItem) {
- subset = items.slice(startIndex, endIndex);
- }
- requestObject.onComplete.call(scope, subset, requestObject);
- }
- };
- this._fetchItems(request, _fetchHandler, _errorHandler);
- return request; // Object
- },
-
- getFeatures: function(){
- return this._features;
- },
-
- close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
- // I have no idea if this is really needed ...
- },
-
- getLabel: function(/* item */ item){
- // summary:
- // See dojo.data.api.Read.getLabel()
- if(this._labelAttr && this.isItem(item)){
- return this.getValue(item, this._labelAttr); //String
- }
- return undefined; //undefined
- },
-
- getLabelAttributes: function(/* item */ item){
- // summary:
- // See dojo.data.api.Read.getLabelAttributes()
- if(this._labelAttr){
- return [this._labelAttr]; //array
- }
- return null; //null
- },
-
- _fetchItems: function(request, fetchHandler, errorHandler){
- // summary:
- // The request contains the data as defined in the Read-API.
- // Additionally there is following keyword "serverQuery".
- //
- // The *serverQuery* parameter, optional.
- // This parameter contains the data that will be sent to the server.
- // If this parameter is not given the parameter "query"'s
- // data are sent to the server. This is done for some reasons:
- // - to specify explicitly which data are sent to the server, they
- // might also be a mix of what is contained in "query", "queryOptions"
- // and the paging parameters "start" and "count" or may be even
- // completely different things.
- // - don't modify the request.query data, so the interface using this
- // store can rely on unmodified data, as the combobox dijit currently
- // does it, it compares if the query has changed
- // - request.query is required by the Read-API
- //
- // I.e. the following examples might be sent via GET:
- // fetch({query:{name:"abc"}, queryOptions:{ignoreCase:true}})
- // the URL will become: /url.php?name=abc
- //
- // fetch({serverQuery:{q:"abc", c:true}, query:{name:"abc"}, queryOptions:{ignoreCase:true}})
- // the URL will become: /url.php?q=abc&c=true
- // // The serverQuery-parameter has overruled the query-parameter
- // // but the query parameter stays untouched, but is not sent to the server!
- // // The serverQuery contains more data than the query, so they might differ!
- //
-
- var serverQuery = request.serverQuery || request.query || {};
- //Need to add start and count
- if(!this.doClientPaging){
- serverQuery.start = request.start || 0;
- // Count might not be sent if not given.
- if (request.count) {
- serverQuery.count = request.count;
- }
- }
- if(!this.doClientSorting){
- if(request.sort){
- var sort = request.sort[0];
- if(sort && sort.attribute){
- var sortStr = sort.attribute;
- if(sort.descending){
- sortStr = "-" + sortStr;
- }
- serverQuery.sort = sortStr;
- }
- }
- }
- // Compare the last query and the current query by simply json-encoding them,
- // so we dont have to do any deep object compare ... is there some dojo.areObjectsEqual()???
- if(this.doClientPaging && this._lastServerQuery!==null &&
- dojo.toJson(serverQuery)==dojo.toJson(this._lastServerQuery)
- ){
- fetchHandler(this._items, request);
- }else{
- var xhrFunc = this.requestMethod.toLowerCase()=="post" ? dojo.xhrPost : dojo.xhrGet;
- var xhrHandler = xhrFunc({url:this.url, handleAs:"json-comment-optional", content:serverQuery});
- xhrHandler.addCallback(dojo.hitch(this, function(data){
- data = this._filterResponse(data);
- if (data.label){
- this._labelAttr = data.label;
- }
- var numRows = data.numRows || -1;
-
- this._items = [];
- // Store a ref to "this" in each item, so we can simply check if an item
- // really origins form here (idea is from ItemFileReadStore, I just don't know
- // how efficient the real storage use, garbage collection effort, etc. is).
- dojo.forEach(data.items,function(e){
- this._items.push({i:e, r:this});
- },this);
-
- var identifier = data.identifier;
- this._itemsByIdentity = {};
- if(identifier){
- this._identifier = identifier;
- for(i = 0; i < this._items.length; ++i){
- var item = this._items[i].i;
- var identity = item[identifier];
- if(!this._itemsByIdentity[identity]){
- this._itemsByIdentity[identity] = item;
- }else{
- throw new Error(this._className+": The json data as specified by: [" + this.url + "] is malformed. Items within the list have identifier: [" + identifier + "]. Value collided: [" + identity + "]");
- }
- }
- }else{
- this._identifier = Number;
- for(i = 0; i < this._items.length; ++i){
- this._items[i].n = i;
- }
- }
-
- // TODO actually we should do the same as dojo.data.ItemFileReadStore._getItemsFromLoadedData() to sanitize
- // (does it really sanititze them) and store the data optimal. should we? for security reasons???
- numRows = (numRows === -1) ? this._items.length : numRows;
- fetchHandler(this._items, request, numRows);
- }));
- xhrHandler.addErrback(function(error){
- errorHandler(error, request);
- });
- // Generate the hash using the time in milliseconds and a randon number.
- // Since Math.randon() returns something like: 0.23453463, we just remove the "0."
- // probably just for esthetic reasons :-).
- this.lastRequestHash = new Date().getTime()+"-"+String(Math.random()).substring(2);
- this._lastServerQuery = dojo.mixin({}, serverQuery);
- }
- },
-
- _filterResponse: function(data){
- // summary:
- // If the data from servers needs to be processed before it can be processed by this
- // store, then this function should be re-implemented in subclass. This default
- // implementation just return the data unchanged.
- // data:
- // The data received from server
- return data;
- },
-
- _assertIsItem: function(/* item */ item){
- // summary:
- // It throws an error if item is not valid, so you can call it in every method that needs to
- // throw an error when item is invalid.
- // item:
- // The item to test for being contained by the store.
- if(!this.isItem(item)){
- throw new Error(this._className+": Invalid item argument.");
- }
- },
-
- _assertIsAttribute: function(/* attribute-name-string */ attribute){
- // summary:
- // This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
- // attribute:
- // The attribute to test for being contained by the store.
- if(typeof attribute !== "string"){
- throw new Error(this._className+": Invalid attribute argument ('"+attribute+"').");
- }
- },
-
- fetchItemByIdentity: function(/* Object */ keywordArgs){
- // summary:
- // See dojo.data.api.Identity.fetchItemByIdentity()
-
- // See if we have already loaded the item with that id
- // In case there hasn't been a fetch yet, _itemsByIdentity is null
- // and thus a fetch will be triggered below.
- if(this._itemsByIdentity){
- var item = this._itemsByIdentity[keywordArgs.identity];
- if(!(item === undefined)){
- if(keywordArgs.onItem){
- var scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
- keywordArgs.onItem.call(scope, {i:item, r:this});
- }
- return;
- }
- }
-
- // Otherwise we need to go remote
- // Set up error handler
- var _errorHandler = function(errorData, requestObject){
- var scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
- if(keywordArgs.onError){
- keywordArgs.onError.call(scope, error);
- }
- };
-
- // Set up fetch handler
- var _fetchHandler = function(items, requestObject){
- var scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
- try{
- // There is supposed to be only one result
- var item = null;
- if(items && items.length == 1){
- item = items[0];
- }
-
- // If no item was found, item is still null and we'll
- // fire the onItem event with the null here
- if(keywordArgs.onItem){
- keywordArgs.onItem.call(scope, item);
- }
- }catch(error){
- if(keywordArgs.onError){
- keywordArgs.onError.call(scope, error);
- }
- }
- };
-
- // Construct query
- var request = {serverQuery:{id:keywordArgs.identity}};
-
- // Dispatch query
- this._fetchItems(request, _fetchHandler, _errorHandler);
- },
-
- getIdentity: function(/* item */ item){
- // summary:
- // See dojo.data.api.Identity.getIdentity()
- var identifier = null;
- if(this._identifier === Number){
- identifier = item.n; // Number
- }else{
- identifier = item.i[this._identifier];
- }
- return identifier;
- },
-
- getIdentityAttributes: function(/* item */ item){
- // summary:
- // See dojo.data.api.Identity.getIdentityAttributes()
- return [this._identifier];
- }
- }
-);
-
-}
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