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sample skeleton application with dojo toolkit & arcgis js api v 4.30
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dojo_app/js/library/dojox/data/CsvStore.js

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define(["dojo/_base/lang", "dojo/_base/declare", "dojo/_base/xhr", "dojo/_base/kernel","dojo/data/util/filter", "dojo/data/util/simpleFetch"],
function(lang, declare, xhr, kernel, filterUtil, simpleFetch) {
var CsvStore = declare("dojox.data.CsvStore", null, {
// summary:
// The CsvStore implements the dojo/data/api/Read API and reads
// data from files in CSV (Comma Separated Values) format.
// All values are simple string values. References to other items
// are not supported as attribute values in this datastore.
//
// Example data file:
// name, color, age, tagline
// Kermit, green, 12, "Hi, I'm Kermit the Frog."
// Fozzie Bear, orange, 10, "Wakka Wakka Wakka!"
// Miss Piggy, pink, 11, "Kermie!"
//
// Note that values containing a comma must be enclosed with quotes ("")
// Also note that values containing quotes must be escaped with two consecutive quotes (""quoted"")
//
// examples:
// var csvStore = new dojox.data.CsvStore({url:"movies.csv");
// var csvStore = new dojox.data.CsvStore({url:"http://example.com/movies.csv");
constructor: function(/* Object */ keywordParameters){
// summary:
// initializer
// keywordParameters:
// - url: String
// - data: String
// - label: String: The column label for the column to use for the label returned by getLabel.
// - identifier: String: The column label for the column to use for the identity. Optional. If not set, the identity is the row number.
this._attributes = []; // e.g. ["Title", "Year", "Producer"]
this._attributeIndexes = {}; // e.g. {Title: 0, Year: 1, Producer: 2}
this._dataArray = []; // e.g. [[<Item0>],[<Item1>],[<Item2>]]
this._arrayOfAllItems = []; // e.g. [{_csvId:0,_csvStore:store},...]
this._loadFinished = false;
if(keywordParameters.url){
this.url = keywordParameters.url;
}
this._csvData = keywordParameters.data;
if(keywordParameters.label){
this.label = keywordParameters.label;
}else if(this.label === ""){
this.label = undefined;
}
this._storeProp = "_csvStore"; // Property name for the store reference on every item.
this._idProp = "_csvId"; // Property name for the Item Id on every item.
this._features = {
'dojo.data.api.Read': true,
'dojo.data.api.Identity': true
};
this._loadInProgress = false; //Got to track the initial load to prevent duelling loads of the dataset.
this._queuedFetches = [];
this.identifier = keywordParameters.identifier;
if(this.identifier === ""){
delete this.identifier;
}else{
this._idMap = {};
}
if("separator" in keywordParameters){
this.separator = keywordParameters.separator;
}
if("urlPreventCache" in keywordParameters){
this.urlPreventCache = keywordParameters.urlPreventCache?true:false;
}
},
// url: [public] string
// Declarative hook for setting Csv source url.
url: "",
// label: [public] string
// Declarative hook for setting the label attribute.
label: "",
// identifier: [public] string
// Declarative hook for setting the identifier.
identifier: "",
// separator: [public] string
// Declatative and programmatic hook for defining the separator
// character used in the Csv style file.
separator: ",",
// separator: [public] string
// Parameter to allow specifying if preventCache should be passed to
// the xhrGet call or not when loading data from a url.
// Note this does not mean the store calls the server on each fetch,
// only that the data load has preventCache set as an option.
urlPreventCache: false,
_assertIsItem: function(/* item */ item){
// summary:
// This function tests whether the item passed in is indeed an item in the store.
// item:
// The item to test for being contained by the store.
if(!this.isItem(item)){
throw new Error(this.declaredClass + ": a function was passed an item argument that was not an item");
}
},
_getIndex: function(item){
// summary:
// Internal function to get the internal index to the item data from the item handle
// item:
// The idem handle to get the index for.
var idx = this.getIdentity(item);
if(this.identifier){
idx = this._idMap[idx];
}
return idx;
},
/***************************************
dojo/data/api/Read API
***************************************/
getValue: function( /* item */ item,
/* attribute|attribute-name-string */ attribute,
/* value? */ defaultValue){
// summary:
// See dojo/data/api/Read.getValue()
// Note that for the CsvStore, an empty string value is the same as no value,
// so the defaultValue would be returned instead of an empty string.
this._assertIsItem(item);
var itemValue = defaultValue;
if(typeof attribute === "string"){
var ai = this._attributeIndexes[attribute];
if(ai != null){
var itemData = this._dataArray[this._getIndex(item)];
itemValue = itemData[ai] || defaultValue;
}
}else{
throw new Error(this.declaredClass + ": a function was passed an attribute argument that was not a string");
}
return itemValue; //String
},
getValues: function(/* item */ item,
/* attribute|attribute-name-string */ attribute){
// summary:
// See dojo/data/api/Read.getValues()
// CSV syntax does not support multi-valued attributes, so this is just a
// wrapper function for getValue().
var value = this.getValue(item, attribute);
return (value ? [value] : []); //Array
},
getAttributes: function(/* item */ item){
// summary:
// See dojo/data/api/Read.getAttributes()
this._assertIsItem(item);
var attributes = [];
var itemData = this._dataArray[this._getIndex(item)];
for(var i=0; i<itemData.length; i++){
// Check for empty string values. CsvStore treats empty strings as no value.
if(itemData[i] !== ""){
attributes.push(this._attributes[i]);
}
}
return attributes; //Array
},
hasAttribute: function( /* item */ item,
/* attribute-name-string */ attribute){
// summary:
// See dojo/data/api/Read.hasAttribute()
// The hasAttribute test is true if attribute has an index number within the item's array length
// AND if the item has a value for that attribute. Note that for the CsvStore, an
// empty string value is the same as no value.
this._assertIsItem(item);
if(typeof attribute === "string"){
var attributeIndex = this._attributeIndexes[attribute];
var itemData = this._dataArray[this._getIndex(item)];
return (typeof attributeIndex !== "undefined" && attributeIndex < itemData.length && itemData[attributeIndex] !== ""); //Boolean
}else{
throw new Error(this.declaredClass + ": a function was passed an attribute argument that was not a string");
}
},
containsValue: function(/* item */ item,
/* attribute|attribute-name-string */ attribute,
/* anything */ value){
// summary:
// See dojo/data/api/Read.containsValue()
var regexp = undefined;
if(typeof value === "string"){
regexp = filterUtil.patternToRegExp(value, false);
}
return this._containsValue(item, attribute, value, regexp); //boolean.
},
_containsValue: function( /* item */ item,
/* attribute|attribute-name-string */ attribute,
/* anything */ value,
/* RegExp?*/ regexp){
// summary:
// Internal function for looking at the values contained by the item.
// description:
// Internal function for looking at the values contained by the item. This
// function allows for denoting if the comparison should be case sensitive for
// strings or not (for handling filtering cases where string case should not matter)
// item:
// The data item to examine for attribute values.
// attribute:
// The attribute to inspect.
// value:
// The value to match.
// regexp:
// Optional regular expression generated off value if value was of string type to handle wildcarding.
// If present and attribute values are string, then it can be used for comparison instead of 'value'
// tags:
// private
var values = this.getValues(item, attribute);
for(var i = 0; i < values.length; ++i){
var possibleValue = values[i];
if(typeof possibleValue === "string" && regexp){
return (possibleValue.match(regexp) !== null);
}else{
//Non-string matching.
if(value === possibleValue){
return true; // Boolean
}
}
}
return false; // Boolean
},
isItem: function(/* anything */ something){
// summary:
// See dojo/data/api/Read.isItem()
if(something && something[this._storeProp] === this){
var identity = something[this._idProp];
//If an identifier was specified, we have to look it up via that and the mapping,
//otherwise, just use row number.
if(this.identifier){
var data = this._dataArray[this._idMap[identity]];
if(data){
return true;
}
}else{
if(identity >= 0 && identity < this._dataArray.length){
return true; //Boolean
}
}
}
return false; //Boolean
},
isItemLoaded: function(/* anything */ something){
// summary:
// See dojo/data/api/Read.isItemLoaded()
// The CsvStore always loads all items, so if it's an item, then it's loaded.
return this.isItem(something); //Boolean
},
loadItem: function(/* item */ item){
// summary:
// See dojo/data/api/Read.loadItem()
// description:
// The CsvStore always loads all items, so if it's an item, then it's loaded.
//
// From the dojo/data/api/Read.loadItem docs:
// If a call to isItemLoaded() returns true before loadItem() is even called,
// then loadItem() need not do any work at all and will not even invoke
// the callback handlers.
},
getFeatures: function(){
// summary:
// See dojo/data/api/Read.getFeatures()
return this._features; //Object
},
getLabel: function(/* item */ item){
// summary:
// See dojo/data/api/Read.getLabel()
if(this.label && this.isItem(item)){
return this.getValue(item,this.label); //String
}
return undefined; //undefined
},
getLabelAttributes: function(/* item */ item){
// summary:
// See dojo/data/api/Read.getLabelAttributes()
if(this.label){
return [this.label]; //array
}
return null; //null
},
// The dojo/data/api/Read.fetch() function is implemented as
// a mixin from dojo.data.util.simpleFetch.
// That mixin requires us to define _fetchItems().
_fetchItems: function( /* Object */ keywordArgs,
/* Function */ findCallback,
/* Function */ errorCallback){
// summary:
// See dojo.data.util.simpleFetch.fetch()
// tags:
// protected
var self = this;
var filter = function(requestArgs, arrayOfAllItems){
var items = null;
if(requestArgs.query){
var key, value;
items = [];
var ignoreCase = requestArgs.queryOptions ? requestArgs.queryOptions.ignoreCase : false;
//See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the
//same value for each item examined. Much more efficient.
var regexpList = {};
for(key in requestArgs.query){
value = requestArgs.query[key];
if(typeof value === "string"){
regexpList[key] = filterUtil.patternToRegExp(value, ignoreCase);
}
}
for(var i = 0; i < arrayOfAllItems.length; ++i){
var match = true;
var candidateItem = arrayOfAllItems[i];
for(key in requestArgs.query){
value = requestArgs.query[key];
if(!self._containsValue(candidateItem, key, value, regexpList[key])){
match = false;
}
}
if(match){
items.push(candidateItem);
}
}
}else{
// We want a copy to pass back in case the parent wishes to sort the array. We shouldn't allow resort
// of the internal list so that multiple callers can get lists and sort without affecting each other.
items = arrayOfAllItems.slice(0,arrayOfAllItems.length);
}
findCallback(items, requestArgs);
};
if(this._loadFinished){
filter(keywordArgs, this._arrayOfAllItems);
}else{
if(this.url !== ""){
//If fetches come in before the loading has finished, but while
//a load is in progress, we have to defer the fetching to be
//invoked in the callback.
if(this._loadInProgress){
this._queuedFetches.push({args: keywordArgs, filter: filter});
}else{
this._loadInProgress = true;
var getArgs = {
url: self.url,
handleAs: "text",
preventCache: self.urlPreventCache
};
var getHandler = xhr.get(getArgs);
getHandler.addCallback(function(data){
try{
self._processData(data);
filter(keywordArgs, self._arrayOfAllItems);
self._handleQueuedFetches();
}catch(e){
errorCallback(e, keywordArgs);
}
});
getHandler.addErrback(function(error){
self._loadInProgress = false;
if(errorCallback){
errorCallback(error, keywordArgs);
}else{
throw error;
}
});
//Wire up the cancel to abort of the request
//This call cancel on the deferred if it hasn't been called
//yet and then will chain to the simple abort of the
//simpleFetch keywordArgs
var oldAbort = null;
if(keywordArgs.abort){
oldAbort = keywordArgs.abort;
}
keywordArgs.abort = function(){
var df = getHandler;
if(df && df.fired === -1){
df.cancel();
df = null;
}
if(oldAbort){
oldAbort.call(keywordArgs);
}
};
}
}else if(this._csvData){
try{
this._processData(this._csvData);
this._csvData = null;
filter(keywordArgs, this._arrayOfAllItems);
}catch(e){
errorCallback(e, keywordArgs);
}
}else{
var error = new Error(this.declaredClass + ": No CSV source data was provided as either URL or String data input.");
if(errorCallback){
errorCallback(error, keywordArgs);
}else{
throw error;
}
}
}
},
close: function(/*dojo/data/api/Request|Object?*/ request){
// summary:
// See dojo/data/api/Read.close()
},
// -------------------------------------------------------------------
// Private methods
_getArrayOfArraysFromCsvFileContents: function(/* string */ csvFileContents){
// summary:
// Parses a string of CSV records into a nested array structure.
// description:
// Given a string containing CSV records, this method parses
// the string and returns a data structure containing the parsed
// content. The data structure we return is an array of length
// R, where R is the number of rows (lines) in the CSV data. The
// return array contains one sub-array for each CSV line, and each
// sub-array contains C string values, where C is the number of
// columns in the CSV data.
// example:
// For example, given this CSV string as input:
// | "Title, Year, Producer \n Alien, 1979, Ridley Scott \n Blade Runner, 1982, Ridley Scott"
// this._dataArray will be set to:
// | [["Alien", "1979", "Ridley Scott"],
// | ["Blade Runner", "1982", "Ridley Scott"]]
// And this._attributes will be set to:
// | ["Title", "Year", "Producer"]
// And this._attributeIndexes will be set to:
// | { "Title":0, "Year":1, "Producer":2 }
// tags:
// private
if(lang.isString(csvFileContents)){
var leadingWhiteSpaceCharacters = new RegExp("^\\s+",'g');
var trailingWhiteSpaceCharacters = new RegExp("\\s+$",'g');
var doubleQuotes = new RegExp('""','g');
var arrayOfOutputRecords = [];
var i;
var arrayOfInputLines = this._splitLines(csvFileContents);
for(i = 0; i < arrayOfInputLines.length; ++i){
var singleLine = arrayOfInputLines[i];
if(singleLine.length > 0){
var listOfFields = singleLine.split(this.separator);
var j = 0;
while(j < listOfFields.length){
var space_field_space = listOfFields[j];
var field_space = space_field_space.replace(leadingWhiteSpaceCharacters, ''); // trim leading whitespace
var field = field_space.replace(trailingWhiteSpaceCharacters, ''); // trim trailing whitespace
var firstChar = field.charAt(0);
var lastChar = field.charAt(field.length - 1);
var secondToLastChar = field.charAt(field.length - 2);
var thirdToLastChar = field.charAt(field.length - 3);
if(field.length === 2 && field == "\"\""){
listOfFields[j] = ""; //Special case empty string field.
}else if((firstChar == '"') &&
((lastChar != '"') ||
((lastChar == '"') && (secondToLastChar == '"') && (thirdToLastChar != '"')))){
if(j+1 === listOfFields.length){
// alert("The last field in record " + i + " is corrupted:\n" + field);
return; //null
}
var nextField = listOfFields[j+1];
listOfFields[j] = field_space + this.separator + nextField;
listOfFields.splice(j+1, 1); // delete element [j+1] from the list
}else{
if((firstChar == '"') && (lastChar == '"')){
field = field.slice(1, (field.length - 1)); // trim the " characters off the ends
field = field.replace(doubleQuotes, '"'); // replace "" with "
}
listOfFields[j] = field;
j += 1;
}
}
arrayOfOutputRecords.push(listOfFields);
}
}
// The first item of the array must be the header row with attribute names.
this._attributes = arrayOfOutputRecords.shift();
for(i = 0; i<this._attributes.length; i++){
// Store the index of each attribute
this._attributeIndexes[this._attributes[i]] = i;
}
this._dataArray = arrayOfOutputRecords; //Array
}
},
_splitLines: function(csvContent){
// summary:
// Function to split the CSV file contents into separate lines.
// Since line breaks can occur inside quotes, a Regexp didn't
// work as well. A quick passover parse should be just as efficient.
// tags:
// private
var split = [];
var i;
var line = "";
var inQuotes = false;
for(i = 0; i < csvContent.length; i++){
var c = csvContent.charAt(i);
switch(c){
case '\"':
inQuotes = !inQuotes;
line += c;
break;
case '\r':
if(inQuotes){
line += c;
}else{
split.push(line);
line = "";
if(i < (csvContent.length - 1) && csvContent.charAt(i + 1) == '\n'){
i++; //Skip it, it's CRLF
}
}
break;
case '\n':
if(inQuotes){
line += c;
}else{
split.push(line);
line = "";
}
break;
default:
line +=c;
}
}
if(line !== ""){
split.push(line);
}
return split;
},
_processData: function(/* String */ data){
// summary:
// Function for processing the string data from the server.
// data: String
// The CSV data.
// tags:
// private
this._getArrayOfArraysFromCsvFileContents(data);
this._arrayOfAllItems = [];
//Check that the specified Identifier is actually a column title, if provided.
if(this.identifier){
if(this._attributeIndexes[this.identifier] === undefined){
throw new Error(this.declaredClass + ": Identity specified is not a column header in the data set.");
}
}
for(var i=0; i<this._dataArray.length; i++){
var id = i;
//Associate the identifier to a row in this case
//for o(1) lookup.
if(this.identifier){
var iData = this._dataArray[i];
id = iData[this._attributeIndexes[this.identifier]];
this._idMap[id] = i;
}
this._arrayOfAllItems.push(this._createItemFromIdentity(id));
}
this._loadFinished = true;
this._loadInProgress = false;
},
_createItemFromIdentity: function(/* String */ identity){
// summary:
// Function for creating a new item from its identifier.
// identity: String
// The identity
// tags:
// private
var item = {};
item[this._storeProp] = this;
item[this._idProp] = identity;
return item; //Object
},
/***************************************
dojo/data/api/Identity API
***************************************/
getIdentity: function(/* item */ item){
// summary:
// See dojo/data/api/Identity.getIdentity()
// tags:
// public
if(this.isItem(item)){
return item[this._idProp]; //String
}
return null; //null
},
fetchItemByIdentity: function(/* Object */ keywordArgs){
// summary:
// See dojo/data/api/Identity.fetchItemByIdentity()
// tags:
// public
var item;
var scope = keywordArgs.scope?keywordArgs.scope:kernel.global;
//Hasn't loaded yet, we have to trigger the load.
if(!this._loadFinished){
var self = this;
if(this.url !== ""){
//If fetches come in before the loading has finished, but while
//a load is in progress, we have to defer the fetching to be
//invoked in the callback.
if(this._loadInProgress){
this._queuedFetches.push({args: keywordArgs});
}else{
this._loadInProgress = true;
var getArgs = {
url: self.url,
handleAs: "text"
};
var getHandler = xhr.get(getArgs);
getHandler.addCallback(function(data){
try{
self._processData(data);
var item = self._createItemFromIdentity(keywordArgs.identity);
if(!self.isItem(item)){
item = null;
}
if(keywordArgs.onItem){
keywordArgs.onItem.call(scope, item);
}
self._handleQueuedFetches();
}catch(error){
if(keywordArgs.onError){
keywordArgs.onError.call(scope, error);
}
}
});
getHandler.addErrback(function(error){
this._loadInProgress = false;
if(keywordArgs.onError){
keywordArgs.onError.call(scope, error);
}
});
}
}else if(this._csvData){
try{
self._processData(self._csvData);
self._csvData = null;
item = self._createItemFromIdentity(keywordArgs.identity);
if(!self.isItem(item)){
item = null;
}
if(keywordArgs.onItem){
keywordArgs.onItem.call(scope, item);
}
}catch(e){
if(keywordArgs.onError){
keywordArgs.onError.call(scope, e);
}
}
}
}else{
//Already loaded. We can just look it up and call back.
item = this._createItemFromIdentity(keywordArgs.identity);
if(!this.isItem(item)){
item = null;
}
if(keywordArgs.onItem){
keywordArgs.onItem.call(scope, item);
}
}
},
getIdentityAttributes: function(/* item */ item){
// summary:
// See dojo/data/api/Identity.getIdentifierAttributes()
// tags:
// public
// Identity isn't a public attribute in the item, it's the row position index.
// So, return null.
if(this.identifier){
return [this.identifier];
}else{
return null;
}
},
_handleQueuedFetches: function(){
// summary:
// Internal function to execute delayed request in the store.
// tags:
// private
// Execute any deferred fetches now.
if(this._queuedFetches.length > 0){
for(var i = 0; i < this._queuedFetches.length; i++){
var fData = this._queuedFetches[i];
var delayedFilter = fData.filter;
var delayedQuery = fData.args;
if(delayedFilter){
delayedFilter(delayedQuery, this._arrayOfAllItems);
}else{
this.fetchItemByIdentity(fData.args);
}
}
this._queuedFetches = [];
}
}
});
//Mix in the simple fetch implementation to this class.
lang.extend(CsvStore, simpleFetch);
return CsvStore;
});