Extracting data from API to Spreadsheet using Google Appscript

Question

I'm trying to build a spreadsheet based around DataDT 's excellent API for 1-minute Forex data. It's simple: for a given date & time, I need the Open and Close price from DataDT. For example, in the following cases, Date+time are the input and Open and Close would be the output.

In other words, it would go from this:

Date        Time    Pair    Open    Close
04/03/2019  20:30   USDJPY  
04/03/2019  21:30   USDJPY      
04/03/2019  22:41   USDJPY  

to this:

Date        Time    Pair    Open    Close
04/03/2019  20:30   USDJPY  111.478 111.475
04/03/2019  21:30   USDJPY  111.482 111.465 
04/03/2019  22:41   USDJPY  111.456 111.458

(Link to the GSpreadsheet )

I've been trying to fetch the data from the API following Ben Collins' excellent tutorial on connecting api's to GSpreadsheets, but given that the objects in this API have quite a different format, I haven't figured a way to handle them.

This is my Google Appscript code so far:

function callDataDT() {

  // Call the DataDT API
  var response = UrlFetchApp.fetch("http://www.datadt.com/api/data/AUDCAD/1/20190403/20190404?api_token=s3MoVn4GAJRJhKcdNJ6zZugFN2C92SBv");


  var json = response.getContentText();
  var data = JSON.parse(json);

}

function displayFXData() {

  // pick up the search term from the Google Sheet
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getActiveSheet();

  var datetime = sheet.getRange(2,13).getValue();

  var forexArray = [data]

  Logger.log(forexArray);

}

To resume, I'm trying to understand how to 1) fetch only objects with a date_time equal to the date_time in the spreadsheet, 2) Output the Open and Close values for that object in the spreadsheet, and 3) Iterate for every non-empty line. I apologize in advance if this question comes off as too basic. I'm still a beginner with Javascript but I've been trying for days to try to understand how to solve this, to no avail. I appreciate any tips you might give me.

As a side note, I wonder if it's possible to modify the URL directly so that it only outputs objects with a given date_time, but I don't think it's possible.

Thank you for reading,

David.-

Answer 1

This one uses your filter value

function getDataDT1(filter) {
  var sr=3
  var filter=filter||'';//You can test this function by providing a default here like '2019-04-03 20:28:00' 
  var r=UrlFetchApp.fetch("http://www.datadt.com/api/data/AUDCAD/1/20190403/20190404?api_token=s3MoVn4GAJRJhKcdNJ6zZugFN2C92SBv");
  var data=JSON.parse(r.getContentText("UTF-8"));
  var ss=SpreadsheetApp.getActive();
  var sh=ss.getActiveSheet();
  sh.clearContents();
  var pair='USDJPY';
  var a=[['','','Without V8','',''],['Date','Time','Pair','Open','Close']];
  if(filter) {//if the filter is null then no filtering takes place
    var dat=new Date(filter);
    var dtv=new Date(dat.getFullYear(),dat.getMonth(),dat.getDate(),dat.getHours(),dat.getMinutes()).valueOf();
  }
  data.forEach(function(r,i){
    var dt=r.DATE_TIME.split(' ');
    var sd=new Date(r.DATE_TIME);
    var sdv=new Date(sd.getFullYear(),sd.getMonth(),sd.getDate(),sd.getHours(),sd.getMinutes()).valueOf();
    if(sdv==dtv || !filter) {//no filtering if filter is null
      var d=dt[0].split('-');
      var t=dt[1].split(':');
      var ds=Utilities.formatString('%s/%s/%s',d[1],d[2],d[0]);
      var ts=Utilities.formatString('%s:%s',t[0],t[1]);
      a.push([ds,ts,pair,data[i].OPEN.toFixed(3),data[i].CLOSE.toFixed(3)]);
    }
  });
  if(a) {
    sh.getRange(sh.getLastRow()+1,1,a.length,a[0].length).setValues(a);
  }else{
     SpreadsheetApp.getUi().alert('No items found');
  }
}