selecting multiple checkbox in jquery

I wrote a jquery code to send values to a php file

$('#def_formSubmit').live("click",function(){

        var query_string = '';
                    
                    $("input[@type='checkbox'][@name='assotop']").each(
                        function()
                        {
                            if(this.checked)
                            {
                                query_string += "&assotop[]=" + this.value;
                            }
                        });

    
    var def_tags = $("#tags").val();
    
    var dataString = 'def_tags='+ def_tags + query_string  ;

    $.ajax({
        type: 'POST',
        url: 'post.php',
        data: dataString,
        cache: false,
        beforeSend: function() {
            $("#QRresult").html(&quo开发者_如何学Ct;<img src='images/loading.gif' />");
        },
        success: function(data5) {
            $("#QRresult").html(data5);
        }
    });
    return false;
});
    

But it does not work and does not sendi checkbox values to my php file.

I think this way of getting checkbox values is a old approach and not working for jquery 1.4.

Remove the @ from your selector. This changed as of 1.3

$("input[@type='checkbox'][@name='assotop']").each(

should be:

$("input[type='checkbox'][name='assotop']").each(

You could also do:

$("input:checkbox[name='assotop']").each(

EDIT: Added input to the selector as noted by @lonesomeday.

EDIT: I guess I'd use the one with input[type='checkbox'] so that querySelectorAll will be used in browsers that support it.

Try this code:

$(document).ready(function(){
    $("#selectAll").change(function(){
        $(".sports").prop('checked', ($(this).is(':checked')));
    });
    $(".sports").change(function(){
        $("#selectAll").prop('checked', false);
    });
});