topic Re: Making request synchronous in Developers Questions

Making request synchronous

roshnibasu — Fri, 24 Feb 2017 16:22:58 GMT

Is there a way to make the esri/request synchronous?

esriRequest(url, {
responseType: "json",
callbackParamName: "callback"
}).then(function(response){
console.log(resp);
});

Re: Making request synchronous

FlavieMORAUX1 — Tue, 27 Mar 2018 08:12:50 GMT

Hy roshni basu,

I ask myslef the same question. Have you found a way to do that?

Regards,

Flavie

Re: Making request synchronous

roshnibasu — Tue, 27 Mar 2018 08:53:15 GMT

Hi Flavie,

I had resolved this issue by making an API at my java code. And then call that API from my javascript making call synchronous.

Regards

Roshni

Re: Making request synchronous

FlavieMORAUX1 — Fri, 30 Mar 2018 09:52:40 GMT

Hi Roshni,

I found another solution, I request myself with dojo class "request/xhr".

Regards,

Flavie

var layerInfo = null;

var requestURL = layerUrl + "?f=json";
requestXHR(requestURL, {
   handleAs: "json",
   sync: true,
   headers: {
      "X-Requested-With": null
   }
}).then(function(data){
   layerInfo = data;
});

return layerInfo;

Re: Making request synchronous

AndresCastillo — Thu, 01 Aug 2019 15:24:42 GMT

Although I see you have the dojo class "request/xhr" property of sync set to a boolean value of true, then object still has a .then method promise.

Can you help me understand how this is synchronous please?

Re: Making request synchronous

LeoLiu1 — Thu, 15 Aug 2019 03:25:18 GMT

Hi Andres,

Check the doc for dojo/request/xhr here:

dojo/request/xhr — The Dojo Toolkit - Reference Guide

Re: Making request synchronous

AndresCastillo — Thu, 15 Aug 2019 12:11:41 GMT

Thank you Leo.

I understand that the requestXHR function is set to sync.

But after it runs, it returns a promise, which would make it async again, right?

Re: Making request synchronous

LeoLiu1 — Mon, 19 Aug 2019 03:15:47 GMT

Hi Andres,

dojo/request/xhr uses XMLHttpRequest.open to perform the request. If 'sync' is true, the promise won't be returned until the request has completed.

Re: Making request synchronous

AndresCastillo — Mon, 19 Aug 2019 12:23:58 GMT

Thank you Leo for your replies.

I will have to do a small test on different scenarios of this to see its' effect on the application's behavior.

Re: Making request synchronous

MeghanKulkarni — Mon, 13 Apr 2020 18:16:09 GMT

Thanks worked like a charm.

Meghan Kulkarni