Angular 2 - Parsing Excel worksheet to Json - json

Question

I have an Excel file with the following content:
Inside my component.ts, I extract the Excel's content as follow:
var testUrl= "excel.xlsx";
var oReq = new XMLHttpRequest();
oReq.open("GET", testUrl, true);
oReq.responseType = "arraybuffer";
oReq.onload = function(e) {
var arraybuffer = oReq.response;
var data = new Uint8Array(arraybuffer);
var arr = new Array();
for(var i = 0; i != data.length; ++i){
arr[i] = String.fromCharCode(data[i]);
}
var bstr = arr.join("");
var workbook = XLSX.read(bstr, {type:"binary"});
var first_sheet_name = workbook.SheetNames[0];
var worksheet = workbook.Sheets[first_sheet_name];
var json = XLSX.utils.sheet_to_json(workbook.Sheets[workbook.SheetNames[0]], {header:1, raw:true});
var jsonOut = JSON.stringify(json);
console.log("test"+jsonOut);
}
oReq.onerror = function(e) {
console.log(e);
}
oReq.send();
XLSX.utils.sheet_to_json will format JSON as follow:
However, I would like the JSON to be as follow:
Most probably I would need to manually create the JSON, but can anyone help me point to the direction on how I can accomplish this?

Answer 1

In your case we need to modify the JSON data by looping over XLSX.utils.sheet_to_json JSON object:
// This object will contain the data in the format we want
var finalObj = { "object": []};
// Variables to track where to insert the data
var locIndex, firstCondIndex, secondCondIndex,
lockey, firstCondKey, secondCondkey;
// We need to initialize all indexes to -1 so that on first time we can get 0, as arrays start with 0 in javascript
locIndex = -1;
// here obj is XLSX.utils.sheet_to_json
obj.object.map((value, index) => {
// we don't want to consider name of columns which is first element of array
if(!index) return;
// Go inside only if not null
if(value[0]) {
// For Location
finalObj.object.push(createObj(value[0]));
locIndex++;
// We also need to store key names to push it's children
lockey = value[0];
firstCondIndex = -1;
}
if(value[1]) {
// For First Condition
finalObj.object[locIndex][lockey].push(createObj(value[1]));
firstCondIndex++;
firstCondKey = value[1];
secondCondIndex = -1;
}
if(value[2]) {
// For Second Condition
finalObj.object[locIndex][lockey][firstCondIndex][firstCondKey].push(createObj(value[2]));
secondCondIndex++;
secondCondkey = value[2];
}
if(value[3]) {
// For Products
// We just push the string
finalObj.object[locIndex][lockey][firstCondIndex][firstCondKey][secondCondIndex][secondCondkey].push(value[3]);
}
});
function createObj(val) {
// We need to initialize blank array so we can push the children of that element later on
var obj = {};
obj[val] = [];
return obj;
}
console.log(finalObj);