[Help] Get field values dynamically from InfoTable

[tallrain]

Hi there!

I'm writing a service to convert any InfoTable to CSV text.

The input is InfoTable without DataShape, it can be any InfoTable, with any filed definition.

Now to make this service possible, I need to read data from InfoTable rows dynamically.

Normally, I can use row.FieldName to get field value.

But in my case, the feild name is a variable, so I want to use some function like row.values[myVariable].

And I cannot find any possible method to read data as I expected.

Any advise?

Thanks a lot!

[CRArko]

Hello.

Would some of the examples offered in this article about Dynamic Queries get you started in the right direction? Let me know if this is helpful.

-- Craig A.

[tallrain · Accepted solution]

Thanks for the information, but I cannot access into that article.

And I've fixed this issue with below codes :):

---------------------------------------------------------------------------------------------------------

var iLF;
var tmp = 'TIME';
var i = 0;
var fd = []; // array to store Fields
fd[0] = 'TIME';

// Get CSV Header
if ((myInfoTable.dataShape===null)||(myInfoTable.dataShape===undefined)) {
iLF = myInfoTable.ToJSON().dataShape.fieldDefinitions;
} else {
iLF = myInfoTable.dataShape.fields;
}
for (var key in iLF) {
if(key != 'TIME') {
i = i + 1;
fd[i] = key; // Store field sequence
tmp = tmp + ',' + key;
}
//var result = key;
//Logger.info("Field Name "+key+" baseType: "+iLF[key].baseType);
}
tmp = tmp + ' \n';
//logger.info('JSON2CSV, i='+i);

// Get CSV Data
var tableLength = myInfoTable.rows.length;
for (var x=0; x < tableLength; x++) {
var row = myInfoTable.rows[x];
//logger.info('JSON2CSV, row='+row);
tmp = tmp + dateFormatISO(row.TIME); // Get TIME Value

var fd2 = []; // To output data in sequence
for (var property in row) {
tmp2 = property; //row property
//logger.info('JSON2CSV, tmp2='+tmp2);
tmp3 = row[property]; //row value
//logger.info('JSON2CSV, tmp3='+tmp3);
var j = fd.indexOf(tmp2);
fd2[j] = tmp3;
}

for (var k=1; k<fd2.length; k++) {
tmp = tmp + ',' + fd2[k];
}
tmp = tmp + ' \n';
}

var result = tmp;

---------------------------------------------------------------------------------------------------------

[tallrain]

I use this service to convert InfoTable into CSV, so that I can display data into Dygraph widget.

And for Dygraph, the 1st field is always Datatime, so this Service put field of TIME for Time Sequence.

Now it works just fine.