How to run parseString() function synchronously in Javascript node.js

Question

I have this code, where I run parseString()to extract some information from an xml file

function parseTime(){

var parser = new xml2js.Parser();
var data = fs.readFileSync('C:\\Temp\\tasks\\acis\\110-1100.sat\\110-1100.sat.response.xml', {encoding:'utf8'});

parser.parseString(data, function (err, result) {

var timeString = result.Message.Response[0].Events[0].MessageReportEvent[8].$.Message;
var fileTime = timeString.substr(13,20);
var filetimeVal = parseFloat(fileTime);

console.log(filetimeVal);

return filetimeVal;

});

};

What changes should I do to run parseString synchronously or is there a way to extract the xml data via a deifferent synchronous method

Did you look at the API documentation of this library? Do they provide a synchronous method? If yes, use that, if not, you are out of luck. Change your code to work asynchronously. — Felix Kling
– Felix Kling, Commented Nov 20, 2015 at 1:55
the documentation implies that the callback is called synchronously, there's an option to make it async - github.com/Leonidas-from-XIV/node-xml2js#options — Jaromanda X
– Jaromanda X, Commented Nov 20, 2015 at 2:12

Charlie · Accepted Answer · 2017-02-03 10:49:59Z

1

The callback of the parseString already runs synchronously. Your program would reach the parsed results before it reaches any other line of code.

There is async switch which is false by default in the options.

However the developers warn that this default might change in the future.

async (default false): Should the callbacks be async? This might be an incompatible change if your code depends on sync execution of callbacks. Future versions of xml2js might change this default, so the recommendation is to not depend on sync execution anyway. Added in 0.2.6.

answered Feb 3, 2017 at 10:49

Charlie

24k12 gold badges65 silver badges97 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to run parseString() function synchronously in Javascript node.js

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related