使用 select2 将 php 数组转换为 javascript 数组

Question

I have the following php array in a laravel variable called $salaries which is passed to a blade view:

array:4 [▼
   2 => "£8, Per hour"
   3 => "£10, Per hour"
   23 => "Up to £10000, Per annum"
   24 => "£10,000 - £15,000, Per annum"
]

In my blade view I have a drop which when changed, I want to load a select2 dropdown with the above options. Below is my code:

$(document).on("change", ".js-selector", function() {

     var options = {!! json_encode($salaries) !!};

     $("#salary_list").empty().select2({
        data: options
     });

})

However nothing is getting loaded into the dropdown. So I've narrowed it down to the options data for select2 not being in the correct format.

When I output options variable to console I'm getting the following object as opposed to a javascript array?

{2: "£8, Per hour", 3: "£10, Per hour", 23: "Up to £10000, Per annum", 24: "£10,000 - £15,000, Per annum"}

How do I transform the options into correct format for the select2 data?

Answer 1

You have to transform your data to the correct format, here you can see the correct data format:

var data = [
    {
        id: 2,
        text: '£8, Per hour'
    },
    {
        id: 3,
        text: '£10, Per hour'
    }
];

You could pass the array in the correct format to the view, something like:

$salaries = \App\Models\Salary::all(); // eloquent collection

$salaries = $salaries->map(function ($salary) {
    return ['id' => $salary->id, 'text' => $salary->text];
})->toArray();

It would give result in something like this:

array:1 [▼
  0 => array:2 [▼
    "id" => 2
    "text" => "£8, Per hour"
  ]
  0 => array:2 [▼
    "id" => 3
    "text" => "£10, Per hour"
  ]
]

Or you can transform the array in javascript, the Select2 documentation explains here how you can transform your data:

Select2 requires that the id property is used to uniquely identify the options that are displayed in the results list. If you use a property other than id (like pk) to uniquely identify an option, you need to map your old property to id before passing it to Select2.

If you cannot do this on your server or you are in a situation where the API cannot be changed, you can do this in JavaScript before passing it to Select2:

var data = $.map(yourArrayData, function (obj) {
  obj.id = obj.id || obj.pk; // replace pk with your identifier

  return obj;
});

In your case it would be something like this:

$(document).on("change", ".js-selector", function() {

    var options = {!! json_encode($salaries) !!};

    var data = $.map(options, function (value, key) {
        return {id: key, text: value};
    });

    $("#salary_list").empty().select2({
        data: data
    });

})

Answer 2

Your array must have the structure like this:

[
   [
        'id' => 2,
        'text' => "£8, Per hour"
   ],
   [
        'id' => 3,
        'text' => "£10, Per hour"
   ],
   [
        'id' => 23,
        'text' => "Up to £10000, Per annum"
   ],
   [
        'id' => 24,
        'text' => "£10,000 - £15,000, Per annum"
   ],
]

https://select2.org/data-sources/arrays

Answer 3

exactly as Serhii said, simply extract the values from you associative array before encoding it:

$(document).on("change", ".js-selector", function() {

     var options = {!! json_encode(array_values($salaries)) !!};

     $("#salary_list").empty().select2({
        data: options
     });

})