Question

I’m failing at probably basic jQuery for returning a new compounded string (image src-paths) for every time an object is clicked.

$(":checkbox").click(function(){
    $(":checked").each(function(){
        var auswahl += $(this).attr('data-imagesrc');
    });

    alert(auswahl);
});

I’m later trying to send this string of image src-paths to a PHP-file to zip those images (the PHP-file zippes from an array of paths).
Unfortunately I’m not yet familiar with arrays if that would be a better solution here.

Answer 1

Your variable auswahl is contained within the each scope meaning that you can’t access it from outside of that function. Declare it outside.

$(":checkbox").click(function(){
    var auswahl = '';
    $(".check:checked").each(function(){
        auswahl += $(this).attr('data-imagesrc');
    });
    alert(auswahl);
});

To send info to the server try $.ajax.