loop with array data

Question 1

i have this code to get three values.

 success: function(json){
 $msg1 = parseFloat(json[0].valor1);
 $msg2 = parseFloat(json[1].valor2);
 $msg3 = parseFloat(json[2].valor3);
 }

but now suppose that i need 200 values. I'm not doing 200 times ...

 $msg1 = parseFloat(json[0].valor1);
 $msg2 = parseFloat(json[1].valor2);
 $msg3 = parseFloat(json[2].valor3);
 //...
 $msg200 = parseFloat(json[199].valor200);

so, i need a loop, correct?

i tried something like this

 for (i=0; i<200; i++) {
 $msg(i+1) = parseFloat(json[i].valor(i+1));
 i++;
 }

but didn't work

thanks

Question 2

Why do you need 200 variables? Why not have one array with 200 elements?

Question 3

This is why The Creator gave the world arrays.

var msgs = [];
for (var i = 0; i < 200; ++i)
 msgs.push(parseFloat(json[i]['valor' + i]));

Note that your JSON data should also keep those "valor" properties as arrays, though in JavaScript you can deal with a bizarre naming scheme like that as in the example above.

edit — oops, typos fixed :-)

Question 4

you code give me an error syntax - javascriptlint.com/online_lint.php. i think you forget a ]

Question 5

no problem :) one more question please Pointy. Anteriorly i access to the values with y: $msg1. With your code, how i do? i try $msg[i]= msgs.push(// but i get $msg is not defined error

Question 6

Well if you set this up as an array, then it would be "msgs[1]" instead of "msgs1".

Question 7

i just copy paste your code and change the y:$msg1 to y: msgs[0], and i get msgs is not defined y: msgs[0],

Question 8

@Wire Creation OK two things: first, move the definition of "msgs" (the var msgs = []; line) outside of the "$(document).ready()" block. Second thing is that you will have to delay the dojo setup code that uses "msgs" until after the ajax call completes. Maybe put it in a function and call it from the ajax handler. (If it's not clear you should probably post a separate question about that part.)

Question 9

$msg = [];
for (var i=0; i<200; i++) {
 $msg.push(parseFloat(json[i]["valor"+i])); 
}

Question 10

As stated by Pointy or:

 var msgs = [];
 for (i=0; i<200; i++) {
 $msg[i] = parseFloat(eval('json[' + i + '].valor(' + i + '+1)'));
 i++;
 }

However eval is slow, so Pointy's answer is better.

Question 11

But what exactly is "$msg(i+1)" supposed to do?

Question 12

var array = json.someid;// or json['someid'];
// json is returned not an array
var msgs = [];
$.each(array, function(index, e) {
 msgs.push(parseFloat[e['valor' + index], 10); 
});

when using parseFloat use the radix parameter unless you want bad things to happen;

javascript needs to be told for example not to parse octal;

Pointy 415k62 gold badges600 silver badges633 bronze badges · Accepted Answer · 2011-04-19 14:09:47Z

4

This is why The Creator gave the world arrays.

var msgs = [];
for (var i = 0; i < 200; ++i)
 msgs.push(parseFloat(json[i]['valor' + i]));

Note that your JSON data should also keep those "valor" properties as arrays, though in JavaScript you can deal with a bizarre naming scheme like that as in the example above.

edit — oops, typos fixed :-)

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edited Apr 19, 2011 at 14:44

answered Apr 19, 2011 at 14:09

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Pointy

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6 Comments

daniel__

daniel__ Over a year ago

you code give me an error syntax - javascriptlint.com/online_lint.php. i think you forget a ]

2011年04月19日T14:22:09.313Z+00:00

daniel__

daniel__ Over a year ago

no problem :) one more question please Pointy. Anteriorly i access to the values with y: $msg1. With your code, how i do? i try $msg[i]= msgs.push(// but i get $msg is not defined error

2011年04月19日T14:54:38.947Z+00:00

Pointy

Pointy Over a year ago

Well if you set this up as an array, then it would be "msgs[1]" instead of "msgs1".

2011年04月19日T16:04:20.533Z+00:00

daniel__

daniel__ Over a year ago

i just copy paste your code and change the y:$msg1 to y: msgs[0], and i get msgs is not defined y: msgs[0],

2011年04月19日T16:12:14.377Z+00:00

Pointy

Pointy Over a year ago

@Wire Creation OK two things: first, move the definition of "msgs" (the var msgs = []; line) outside of the "$(document).ready()" block. Second thing is that you will have to delay the dojo setup code that uses "msgs" until after the ajax call completes. Maybe put it in a function and call it from the ajax handler. (If it's not clear you should probably post a separate question about that part.)

2011年04月19日T18:03:02.083Z+00:00

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