Javascript Code example

Javascript code posted
created at 18 Apr 10:47

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/*!
 * Datapel apiConnect Library v1.2.0 (http://api.datapel.net)
 * Copyright 2011-2016 Datapel Systems Pty Ltd.
 * Licensed under MIT
 */

if (typeof jQuery === 'undefined') { throw new Error('Datapel API Connection JavaScript requires jQuery') }

/* ========================================================================
 * apiConnect: apiConnect.js v1.2.0
 * http://api.datapel.net/samplecode
 * ========================================================================
 * Copyright 2011-2016 Datapel Systems Pty Ltd.
 *
 * Example Usage:
 * ========================================================================
 * apiConnect.username = "username";
 * apiConnect.password = "password";
 * apiConnect.url = "http://url:port";
 * 
 * ======================================================================== */

var apiConnect = new function () {
    // Define Connection Properties
    this.masterKey = "";
    this.username = "";
    this.password = "";
    this.url = "";
    this.token = "";
    this.recordCount = 0;
    this.pageCount = 0;
    this.pageNumber = 0;
    this.pageSize = 0;
    this.pageStartTime = 0;
    this.pageEndTime = 0;
    this.pagePrimaryKeyName = "";
    this.pageTableName = "";
    this.pageQueryFilter = "";
    this.pageColumns = "";
    this.pageTag = "";
    this.pageElapseTime = 0;
    this.pageResultSet = [];
    this.requestResultSet = [];
    this.requestEstimatedTime = 0;
    this.onPageComplete = function(){};
    this.onPageException = function(){};
    this.onRequestReady = function(){};
    this.onRequestComplete = function(){};    
    this.localscope = {};

    // ========================================================================
    // openService();
    //
    this.openService = function (callback) {
        // allow cross domain access
        $.support.cors = true;
        // Initialise the token
        this.token = "";
        // Encode authorisation credentials
        this.masterKey = this.encode64(this.username + ':' + this.password);
        // Request API session token
        console.log(this.masterKey);                                  
        // trigger the caller
                           
   
    };
    // ========================================================================
    // getRequest()
    //    
    this.getRequest = function (apiResource, apiFilter, callback) {
        var urlResponse;
        // form the request based on the resource
        var urlRequest = this.url + "/json/" + apiResource + "?filter~" + encodeURI(apiFilter);
        // append security credentials
        urlRequest = urlRequest + '&authorization=' + this.masterKey 
        // pass request to server
        console.log("requesting: " + urlRequest);
        // allow cross domain by default
        $.support.cors = true;
        // Make request
        $.ajax({
            // pass the resource request
            url: urlRequest,
            type: 'GET',
            crossDomain: true,
            async: true,
            success: function(result) {
                // completed request
                callback(result);
            },
            error: function() {
                //failed result                
                callback(false);
            }
        });
    };    
    // ========================================================================
    // getTimeStamp()
    //    
    this.getTimeStamp = function (callback) {
        var urlResponse;
        // form the request based on the resource
        var urlRequest = this.url + "/json/timestamp?filter~";
        // append security credentials
        urlRequest = urlRequest + '&authorization=' + this.masterKey 
        // pass request to server
        console.log("requesting: " + urlRequest);        
        // allow cross domain by default
        $.support.cors = true;
        // Make request
        $.ajax({
            // pass the resource request
            url: urlRequest,
            type: 'GET',
            crossDomain: true,
            async: true,
            success: function(result) {
                // check response is valid
                if(result!=null && result !=undefined) {
                    //successful result
                    callback(result.ServerTimeStamp);                    
                } else {
                    //invalid result
                    callback(false);                    
                }            
            },
            error: function() {
                //failed result        
                callback(false);                
            }
        });
    };
    // ========================================================================
    // getDataSetPage()
    //    
    this.getDataSetPage = function (tableName, tableColumns, tableFilter, tablePkey, pageSize, pageNumber) {
        var queryString = "";
        try {
            // All Rows or filtered dataSet
            if (!tableFilter.trim()) {
            // is empty or whitespace
                tableFilter = "1=1";
            }
            // All Columns or subSet
            if (!tableColumns.trim()) {
            // is empty or whitespace
                tableColumns = "*";
            }
            // create the page query with filter
            queryString = "SELECT " + tableColumns + " FROM " + tableName + " WHERE " + tableFilter + " AND " + tablePkey + " IN ";
            queryString = queryString + "(SELECT TOP " + pageSize + " " + tablePkey + " FROM " + tableName + " WHERE " + tableFilter + " AND " + tablePkey + " NOT IN ";
            queryString = queryString + "(SELECT TOP " + pageSize*(pageNumber-1) + " " + tablePkey + " FROM " + tableName + " WHERE " + tableFilter + " ORDER BY " + tablePkey + ")";
            queryString = queryString + " ORDER BY " + tablePkey + ")" + " ORDER BY " + tablePkey;
            // echo the query for debug
            console.log("Page Query:" + queryString);
            //debugger;            

        } catch (ex) {
          alert("getDataset: Failed!");
          console.log("Error:" + ex.message);
          queryString = "";          
        }
        // Return the page query
        return(queryString);
    };

    // ========================================================================
    // getPagedRequest()
    //    
    this.getPagedRequest = function (tableFilter, onPageComplete, onPageException, onRequestReady, onRequestComplete) {
        // New QueryString
        var queryRequest = "";
        var self = this;        
        // Initialise context
        self.pageQueryFilter = tableFilter;
        // Initialise Event callbacks
        self.onPageComplete = onPageComplete;
        self.onPageException = onPageException;
        self.onRequestReady = onRequestReady;
        self.onRequestComplete = onRequestComplete;
        self.pageResultSet = [];
        self.requestResultSet = [];
        // Determine the number of records in the dataSet
        setTimeout(function() {
            // From Table get RecordCount
            queryRequest = "SELECT COUNT(*) AS recordCount FROM " + self.pageTableName + " WHERE " + self.pageQueryFilter;
            apiConnect.getRequest("sql", queryRequest, apiConnect.pagedRequestBegin);            
        }, 3000);         
    };    
    // ========================================================================
    // pagedRequestBegin()
    //    
    this.pagedRequestBegin = function (resultSet) {
        var queryRequest = "";
        var recordCount = 0;
        var pagesCount = 1;
        var self = apiConnect;            
        // Echo resultSet to console
        if (resultSet) {
            console.log("Items Loaded :" + JSON.stringify(resultSet));
        } else {
            console.log("No results.");
        }
        // Validate the previous resultSet            
        if (resultSet) {
            console.log("Records Loaded :" + JSON.stringify(resultSet));
            recordCount = parseInt(resultSet[0].recordCount);
            if (recordCount > 0) {
                pagesCount = Math.ceil(recordCount / self.pageSize);
            }
        } else {
            console.log("No results.");
        }
        // Initialise the apiConnect with pageCount 
        self.pageCount = pagesCount;
        // initiate the event callback
        self.onRequestReady('onRequestReady');
        // fire Request("sql-request", filter-select query, callback)
        setTimeout(function() {
            // Complete Request
            self.pageNumber = 1;
            queryRequest = self.getDataSetPage(self.pageTableName, self.pageColumns, self.pageQueryFilter, self.pagePrimaryKeyName, self.pageSize, self.pageNumber);
            if (queryRequest.trim()) {
                self.pageStartTime = performance.now();
                self.getRequest("sql", queryRequest, self.pagedRequestNext);
            } else {
                console.log("Server Connection Failed: (Invalid DataSet)");    
            }            
        }, 3000);                 
    };
    // ========================================================================
    // pagedRequestNext()
    //    
    this.pagedRequestNext = function (resultSet) {
        // New QueryString
        var queryRequest = "";
        var self = apiConnect;
        // Mark Page Loaded
        self.pageEndTime = performance.now();
        self.pageElapseTime = self.pageEndTime - self.pageStartTime;
        self.requestEstimatedTime = self.pageElapseTime * self.pageCount;
        // Echo resultSet to console
        if (resultSet) {
            self.pageResultSet = resultSet;
            self.requestResultSet = self.requestResultSet.concat(resultSet);
            console.log("pageResultSet :" + JSON.stringify(resultSet));            
        } else {
            console.log("No results.");
        }
        // initiate the event callback
        self.onPageComplete('onPageComplete');            
        // Page Download Complete - step to next page
        self.pageNumber = self.pageNumber + 1;        
        // fire page Request with filter-select query, then callback
        setTimeout(function() {
            // Complete Request
            self.pageStartTime = performance.now();
            queryRequest = self.getDataSetPage(self.pageTableName, self.pageColumns, self.pageQueryFilter, self.pagePrimaryKeyName, self.pageSize, self.pageNumber);
            if (queryRequest.trim()) {
                if (self.pageNumber != self.pageCount) {
                    // Download next page in Request Set
                    self.getRequest("sql", queryRequest, self.pagedRequestNext);
                } else {
                    // Final page download in Request Set
                    self.getRequest("sql", queryRequest, self.pagedRequestComplete);                    
                }
            } else {
                console.log("Server Connection Failed: (Invalid DataSet)");
            }            
        }, 3000);              
    };
    // ========================================================================
    // pagedRequestComplete()
    //    
    this.pagedRequestComplete = function (resultSet) {
        try {
            var self = apiConnect;
            if (resultSet) {
                self.pageResultSet = resultSet;
                self.requestResultSet =  self.requestResultSet.concat(resultSet);
                console.log("requestResultSet :" + JSON.stringify(self.requestResultSet));
            } else {
                console.log("No results.");
            }
            // initiate the event callback
            self.onRequestComplete('onRequestComplete');            
            console.log("Request COMPLETE!");
        } catch (ex) {
          alert("Failed!");
          console.log("Error:" + ex.message);    
        }        
    };    
    // Use this function to encode64 ONLY FOR APIKEY
    this.encode64 = function (input) {

          var keyStr = "ABCDEFGHIJKLMNOP" +
                   "QRSTUVWXYZabcdef" +
                   "ghijklmnopqrstuv" +
                   "wxyz0123456789+/" +
                   "=";

         var output = "";
         var chr1, chr2, chr3 = "";
         var enc1, enc2, enc3, enc4 = "";
         var i = 0;     
         do {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
               enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
               enc4 = 64;
            }
            output = output +
               keyStr.charAt(enc1) +
               keyStr.charAt(enc2) +
               keyStr.charAt(enc3) +
               keyStr.charAt(enc4);
            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";
         } while (i < input.length);
         return output;
    };
};
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