Javascript: convert a multidimensional array to object in ajax

Question

I try to send a javascript array to php using ajax he's what I did

var d = $("#fromDate").val();
var arr = [];
for(var x=0; x<count_select; x++){
       var myArray = new Array();
       myArray['val'] = $("select").eq(x).val();
       myArray['type'] = $("select").eq(x).attr('type');
       myArray['id'] = $("select").eq(x).attr('id');
       arr.push(myArray);
       myArray = new Array();
}

The array contains elements as I want in a multidimensional array.

But when I send it to php page like this: (Array is not converted yet here's where I want to convert it to send as json)

$.ajax({
     type: "POST",
     url: "URL_PATH",
     data: {"arrar":arr,"date":d},
     dataType: "json",
        success: function(data) {
            alert(data);
        }
});

In the network tab i find

date    "2017-07-08"

and can't find the array so how can I convert this multidimensional array to an object so I can handle it using php

Hey...Are you sure JS supports associative arrays? No it doesn't!! — Nidhin David
– Nidhin David, Commented Jul 8, 2017 at 12:59

charlietfl · Accepted Answer · 2017-07-08 13:11:22Z

1

Can simplify this using map() and by using an object for each item:

var arr = $('select').map(function() {
  return {
    val:  this.value,
    id:   this.id,
    type: $(this).attr('type')
  }
}).get();

edited Jul 8, 2017 at 13:11

answered Jul 8, 2017 at 13:05

charlietfl

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4 Comments

PHP User Over a year ago

Thanks but the result is long arr[0][val] "1" arr[0][id] "72" arr[0][type] "parent" arr[1][val] "2" arr[1][id] "8" arr[1][type] "sub" arr[2][val] "0" arr[2][id] "6" arr[2][type] "sub" date "2017-07-08" How to handle it using php as these are not fixed parameters they might be less or more

PHP User Over a year ago

foreach(what?) I get parameters not an object to loop through they are just parameters and don't know their count

charlietfl Over a year ago

It is an array of arrays in php. If you need count it is count($_POST['arrar']) or a loop would be like : foreach( $_POST['arrar'] as $selectItem)

PHP User Over a year ago

$array = $_POST['arr']; then used foreach to handle the data. Thanks a lot

prasanth · Accepted Answer · 2017-07-08 13:00:25Z

1

var myArray = {} is object not a array .Because Array not have key value pair in js.

var arr=[];
for(var x=0; x<10; x++){
       var myArray = {};//try with object not a array
       myArray['val'] = 10;
       myArray['type'] = 11;
       myArray['id'] = 12;
       arr.push(myArray);
}

console.log(arr)

answered Jul 8, 2017 at 13:00

prasanth

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Comments

webdeb · Accepted Answer · 2017-07-08 13:11:04Z

var array = new Array()
array["foo"] = "bar";

console.log(JSON.stringify(array))
// -> []

Oops?

The problem here is, that your array is not going to be converted to text properly when its going to be send in the post request. Arrays in JS only expect numbers as indexes, there are no associative arrays in JS. The analogy to associative arrays are objects. where you have a simple key: value store.

What you really want is an object

var obj = {};
obj["foo"] = "bar";

console.log(JSON.stringify(obj))
// -> { "foo": "bar" }

In Javascript everything is an object, so you could do things like:

var n = 1;
n.name = "number with property";

And you would't get an error, even if that makes no sense ;)

Well some people voted down, but this is actually the right answer, with explanation

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