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POJavascript / NodeJs different async functions resulting in one big json file
 

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  1. POJavascript / NodeJs different async functions resulting in one big json file
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    <p>I simply can't figure this out. I have a folder with files. I want to create a json with information of these files. To be precise the filename, a regexed version of the filename and additional data I get from a ajax call.</p> <p>The individual parts work perfectly. In fact, if I run my code in sync, I will get the result I want. Something like this:</p> <pre><code> [ { "filename" : "first file", "regexname" : "first file", "ajaxresult" : "first file" }, { "filename" : "second file", "regexname" : "second file", "ajaxresult" : "second file" }, ] </code></pre> <p>But I want to do it async because the XHR module I use doesn't work properly when trying to do everything 'in sync' and it's of course blocking especially with a lot of files. My 'in sync' code looks like this (a bit simplified to make it shorter )</p> <pre><code> fs.readdir(datapath, function(err, files) { var data = new Array(); if(err) throw err; files.forEach(function(file){ var filename = file , regex= filename.replace(/regex/)/i, "") , filepath = './public/config/dataconfig.js' , ajaxResults = getFile(url) , mapFiles = null mapFiles = { filename:filename, regexname:regex, ajaxcall:ajaxResults} data[data.length] = mapfiles; } var JSONdata= JSON.stringify(data, null, 4); fs.writeFile(filepath, JSONdata, function(e) { if (!e) { console.log('Done') }else{ console.log('Failed', e) }; }); }); </code></pre> <p>I tried wrapping the ajaxcall in a promise, but I lose the filename and regexname inside the promise. like so:</p> <pre><code> fs.readdir(datapath, function(err, files) { var data = new Array(); if(err) throw err; files.forEach(function(file){ var filename = file , regex= filename.replace(/regex/)/i, "") , filepath = './public/config/dataconfig.js' , mapFiles = null // Make promise for async call with a url composed of the regex var promise = getFile(url); promise.then( function(result) { mapFiles = { filename:filename, regexname:regex, ajaxcall:result} data[data.length] = mapfiles; var JSONdata= JSON.stringify(data, null, 4); fs.writeFile(filepath, JSONdata, function(e) { if (!e) { console.log('Done') }else{ console.log('Failed', e) }; }); }); }); </code></pre> <p>This gives me the following result:</p> <pre><code> [ { "filename" : "first file", "regexname" : "first file", "ajaxresult" : "first file" }, { "filename" : "first file", "regexname" : "first file", "ajaxresult" : "second file" }, ] </code></pre> <p>So my final thought was to use something like the async module for node. writing the json after I get callbacks back from the function. but I can't get that to work either.</p> <p>Thanks in advance!</p> <p><strong>[EDIT - what I forgot to mention ]</strong></p> <p>A thing I forgot to mention is that the AjaxCall url is built with the regex. So something like this: </p> <pre><code> url = 'http://www.test.com/'+regex </code></pre> <p>So this (as I see it) would mean I do the regex before calling the ajaxcall but I also need the regex after the call to write in the Json. I hope this makes sence</p> <p><strong>[EDIT 2 - A bit more information]</strong></p> <p>My XHR call looks like this (without my faulty promise solution. In that case I return the promise with the result):</p> <pre><code>// Get info function getFile(url) { xhr = new XMLHttpRequest(); xhr.open("GET", url); xhr.onreadystatechange = handler var ajaxResult = null //Callback function handler (){ // If status is ready if (this.readyState == 4 &amp;&amp; this.status == 200) { ajaxResult = eval(this.responseText); console.log('XHR OK') }; }; xhr.send(null); return ajaxResult[0]; }; </code></pre>
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