How to parse a string from servlet to javascript and created a formatted object which contains array values

Question

I have managed to create below string and pass it to jsp

"Dataset1:[ 10,22,33,44,55,66,7 ],Dataset2:[ 20,12,43,24,55,26,47 ],Dataset3:[ 30,12,53,64,5,16,77 ],Dataset4:[4 0,12,63,64,5,6,44 ]"

My chart function accepts data as js object described below

var graph_dataset = {
                "Dataset1":[10,22,33,44,55,66,7  ]
                ,"Dataset2":[20,12,43,24,55,26,47  ]
                ,"Dataset3":[30,12,53,64,5,16,77  ]
                ,"Dataset4":[40,12,63,64,5,6,44  ]
            };

so that I should be able to get my array (value corresponding to each key) if I call it by graph_dataset.Dataset4.

I have tried lot of things by hit and trail including JSON.parse. Please help with a piece of code

it would be easier if passed a json string to the jsp, "{Dataset1:[ 10,22,33,44,55,66,7 ],Dataset2:[ 20,12,43,24,55,26,47 ] ... }" — Gregory
– Gregory, Commented Jun 16, 2017 at 21:39

Will · Accepted Answer · 2017-06-16 21:55:29Z

1

This makes me feel dirty but it gets the job done.

let str = "Dataset1:[ 10,22,33,44,55,66,7 ],Dataset2:[ 20,12,43,24,55,26,47 ],Dataset3:[ 30,12,53,64,5,16,77 ],Dataset4:[40,12,63,64,5,6,44 ]";
let result = str.split(',Dataset');
result[0] = result[0].split('Dataset')[1];

let obj = result.reduce( (prev, curr) => {
    let ar = curr.split(':');
    prev['Dataset' + ar[0]] = JSON.parse(ar[1]);
    return prev;
}, {} );

console.log(obj);

answered Jun 16, 2017 at 21:55

Will

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1 Comment

Vijay Over a year ago

Thanks a lot Will, for answering.. I later managed to correctly form script the string like below var str='{"Dataset1":[10,22,33,44,55,66,7],"Dataset2":[20,12,43,24,55,26,47],"Dataset3":[30,12,53,64,5,16,77]}'; and below command is working perfectly now var graph_thread_minutes=JSON.parse(str); Thanks for your help

Vijay · Accepted Answer · 2017-06-16 22:05:22Z

0

Answering for someone who is facing similar difficulty.

I corrected the string formatting and added quotes and {} wherever applicable.

After correct formatting string looks like var str='{"Dataset1":[10,22,33,44,55,66,7],"Dataset2":[20,12,43,24,55,26,47],"Dataset3":[30,12,53,64,5,16,77]}';

I am able to parse the string and generate graph out of it successfully.

obj=JSON.parse(str);

answered Jun 16, 2017 at 22:05

Vijay

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