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Reading the headers of a CSV file using angularjs - javascript

My CSV file consists of headers namely (DateTime,Samplevalue and hostname).
And
I want to read these headers and for instance, if the csv file consists of DateTime as it's header I want to print ( this is suitable for timeseries database)
How to achieve this using angularjs ?
How to code this ?
For instance, my CSV looks like
Hostname,Samplevalue,DateTime
Host1,1,2018-05-04 31:21:11
Host2,1,2018-05-05 21:15:10
Host3,1,2018-05-04 11:11:13
Host4,1,2018-05-06 41:21:15
Need to just read any one of the header and print something like
Console.log(datetime header is suitable fr this database)
Thanks in advance.

You can use $http and 1) split the returned string by line breaks 2)
split the first line by commas :
$http.get('path/to/csv/').then(function(csv) {
var headers = csv.data.split('\n')[0].split(',')
headers.forEach(function(header, index) {
console.log('header #'+index, header)
})
})

Do you mean you wish to read the CSV data?
If yes, the best way to deal with CSV files in JavaScript is to convert it into JSON data.
Check out https://github.com/evanplaice/jquery-csv, its a simple library where you can pass your CSV data and get JSON in return. Hope it helps!

Related

I have a Json Which look like
{
"2001":{
"abc":2000,
"bcd":2005
},
"2002":{
"abc":3000,
"bcd":3500
}
}
I want a specific way that converts this Json to excel file.
And When that excel file is again converted to Json it should give me above styled json again. Is there any way that I can convert this Json to excel and Excel to Json, but I won't want to change syntex of Json.While the Excel should also show every detail in Json have.
This line fetch data from excel sheet:
var rowMajor = XLSX.utils.sheet_to_json(workbook.Sheets[sheetName], { raw: true, header: 1 });
I am thinking to fetch name of the sheet where the year is been set, and set it as a key to them by local concatenation. Multiple sheet has multiple data which would enclose as seen above in the question. But while reversing the thing 'Json to excel' I am not getting any idea how to do it by code, while the idea to do it is clear.

you can simply use xlsx library
https://www.npmjs.com/package/xlsx
Ex: XLSX.write(wb, {Props:{Author:"SheetJS"}});
wb: is your data.
and inside {} is your file name(SheetJS name of your file).

I have a lot of data loaded in my database where some of the documents loaded are not JSON files & just binary files. Correct data looks like this: "/foo/bar/1.json" but the incorrect data is in the format of "/foo/bar/*". Is there a mechanism in MarkLogic using JavaScript where I can filter out this junk data and delete them?
PS: I'm unable to extract files with mlcp that have a "?" in the URI and maybe when I try to reload this data I get this error. Any way to fix that extract along with this?

If all of the document URIs contain a ? and are in that directory, then you could use cts.uriMatch()
declareUpdate();
for (const uri of cts.uriMatch('/foo/bar/*?*') ) {
xdmp.documentDelete(uri)
}
Alternatively, if you are looking to find the binary() documents, you can apply the format-binary option to a cts.search() with a cts.directoryQuery() and then delete them.
declareUpdate();
for (const doc of cts.search(cts.directoryQuery("/foo/bar/"), ['format-json']) ) {
xdmp.documentDelete(fn.baseUri(doc));
}
They are probably being persisted as binary because there is no file extension when the URI ends with a question mark and some querystring parameter values i.e. 1.json?foo=bar instead of 1.json
It is difficult to diagnose and troubleshoot without seeing what your MLCP job configs are and knowing more about what you are doing to load the data.

This is my json data
var data = {john#gmail.com: true}
In my template i am trying this way to display data but its not working
{{data.[john#gmail.com]}}
I even tried this way
{{data.['john#gmail.com']}}
and also
{{data.john#gmail.com}}
but if i had changed my json data to
var data = {john:true}
and try
{{data.[john]}}
its working and displaying the output as true
Can anyone please point me where i am making mistake ?

It is like this data["john#gmail.com"]. Here is a good Resource to read

I'm hoping to use a Google Sheets CSV as a data source. I'd like to fetch the CSV data on the client, then convert into JSON.
I'm able to fetch the CSV, which returns a ReadableStream. However, I'm not sure how to correctly read that response and convert into JSON.
I've found an npm package which should help convert the CSV data to JSON, but having a little bit of a time working with the stream.
Example: https://jsfiddle.net/21jeq1h5/3/
Can anyone point me in the right direction to use the ReadableStream?

Since CSV is simply text, the solution is the use the response.text() method of the fetch() API.
https://developer.mozilla.org/en-US/docs/Web/API/Body/text
Once the text is onboard, it is as simple as parsing the CSV out of the file. If you want objects as an output it is imperative the headers are included in the CSV (which yours are).
I've included the code snippet below. It won't run on SO because SO sets the origin to null on AJAX requests. So I've also included a link to a working codepen solution.
fetch('https://docs.google.com/spreadsheets/d/e/KEY&single=true&output=csv')
.then(response => response.text())
.then(transform);
function transform(str) {
let data = str.split('\n').map(i=>i.split(','));
let headers = data.shift();
let output = data.map(d=>{obj = {};headers.map((h,i)=>obj[headers[i]] = d[i]);return obj;});
console.log(output);
}
Pen
https://codepen.io/randycasburn/pen/xjzzvW?editors=0012
Edit
I should add that if you truly want this in a JSON string (per your question), you can run
json = JSON.stringify(output);

I am having json file like this. It contains some data.
[{\"Frequency\":\"Building 1\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":46,\"Value1\":26,\"Value2\":22},{\"Name\":\"food\",\"Value\":32,\"Value1\":26,\"Value2\":12}]},{\"Frequency\":\"Building 2\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":48,\"Value1\":26,\"Value2\":23},{\"Name\":\"food\",\"Value\":34,\"Value1\":33,\"Value2\":12}]},{\"Frequency\":\"Building 3\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":57,\"Value1\":22,\"Value2\":24},{\"Name\":\"food\",\"Value\":42,\"Value1\":16,\"Value2\":11}]},{\"Frequency\":\"Building 4\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":59,\"Value1\":26,\"Value2\":33},{\"Name\":\"food\",\"Value\":44,\"Value1\":26,\"Value2\":35}]},{\"Frequency\":\"Building 5\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":62,\"Value1\":26,\"Value2\":11},{\"Name\":\"food\",\"Value\":48,\"Value1\":26,\"Value2\":3}]},{\"Frequency\":\"Building 6\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":62,\"Value1\":26,\"Value2\":21},{\"Name\":\"food\",\"Value\":47,\"Value1\":26,\"Value2\":24}]},{\"Frequency\":\"Building 7\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":58,\"Value1\":26,\"Value2\":22},{\"Name\":\"food\",\"Value\":43,\"Value1\":26,\"Value2\":22}]},{\"Frequency\":\"Building 8\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":48,\"Value1\":26,\"Value2\":2},{\"Name\":\"food\",\"Value\":34,\"Value1\":26,\"Value2\":33}]}]
I want to store this json file into dataset in d3.js. or
I have given all data are static into my code. I want to give these data from json file to d3.js can any one give me example.
my expected result is
dataset = JSON.parse("[{\"Frequency\":\"Building 1\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":46,\"Value1\":26,\"Value2\":22},{\"Name\":\"food\",\"Value\":32,\"Value1\":26,\"Value2\":12}]},{\"Frequency\":\"Building 2\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":48,\"Value1\":26,\"Value2\":23},{\"Name\":\"food\",\"Value\":34,\"Value1\":33,\"Value2\":12}]},{\"Frequency\":\"Building 3\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":57,\"Value1\":22,\"Value2\":24},{\"Name\":\"food\",\"Value\":42,\"Value1\":16,\"Value2\":11}]},{\"Frequency\":\"Building 4\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":59,\"Value1\":26,\"Value2\":33},{\"Name\":\"food\",\"Value\":44,\"Value1\":26,\"Value2\":35}]},{\"Frequency\":\"Building 5\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":62,\"Value1\":26,\"Value2\":11},{\"Name\":\"food\",\"Value\":48,\"Value1\":26,\"Value2\":3}]},{\"Frequency\":\"Building 6\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":62,\"Value1\":26,\"Value2\":21},{\"Name\":\"food\",\"Value\":47,\"Value1\":26,\"Value2\":24}]},{\"Frequency\":\"Building 7\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":58,\"Value1\":26,\"Value2\":22},{\"Name\":\"food\",\"Value\":43,\"Value1\":26,\"Value2\":22}]},{\"Frequency\":\"Building 8\",\"Data\":[{\"Name\":\"Medicine\",\"Value\":48,\"Value1\":26,\"Value2\":2},{\"Name\":\"food\",\"Value\":34,\"Value1\":26,\"Value2\":33}]}]");
inside the bracket my data should be come i dont know how to do this can any tell me how to do this.
before i tried this but it is not working.
d3.json("D3json.json", function(error, data) {
var datas = data;
})
here is my jsfiddle example: Click here to see the example
Thanks
Vinoth S

If I understood your question correctly, you are trying to dynamically load JSON data in contrast to having it hard-coded in your file.
Here is an example how to do it: http://bl.ocks.org/Jverma/887877fc5c2c2d99be10
In general, you have to execute the drawing part after you successfully loaded the data (within the callback function of d3.json())