Meteor is mostly backward compatible to even < 1.0 projects. Therefore lots of code is still callback based. So is theMeteor.call method. You can easily wrap it into a Promise-based approach:
exportconstcallMethod=({name,args})=>newPromise((resolve,reject)=>{Meteor.call(name,args,(error,result)=>{if(error){returnreject(error)}returnresolve(result)})})AlthoughMeteor.call supports multiple arguments I rather prefer to pass a single object with named arguments to keep the code more expressive.
You can then usecallMethod natively in an async environment:
Template.myTemplate.events({'click .some-button':asyncfunction(event,templateInstance){constage=awaitcallMethod({name:'getAge',args:{name:'John Doe'}})console.log(age)// whatever the method returned}})Additionally you can "hook" into these calls and thus mix callbacks with promises and create a decent UX experience when method calls are part of user interactions:
exportconstcallMethod=({name,args,prepare,receive,success,failure})=>{// before callif(typeofprepare==='function'){prepare()}// create the promiseconstpromise=newPromise((resolve,reject)=>{Meteor.call(name,args,(error,result)=>{// on receivedif(typeofreceive==='function'){receive()}if(error){returnreject(error)}returnresolve(result)})})// on successif(typeofsuccess==='function'){promise.then(success)}// on errorif(typeoffailure==='function'){promise.catch(failure)}returnpromise}The code can then be used for example to display a "waiting" indicator:
Template.myTemplate.events({'click .update-button':asyncfunction(event,templateInstance){constupdatedDoc=awaitcallMethod({name:'updateUser',args:{name:'John Doe',age:42},prepare:()=>templateInstance.state.set('updating',true),receive:()=>templateInstance.state.set('updating',false),failure:er=>alert(er),success:()=>alert('updated')})// process updatedDoc if desired})I regularly publish articles here on dev.to aboutMeteor andJavaScript. If you like what you are reading and want to support me, you cansend me a tip via PayPal.
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