如何从PHP将正确的数据类型传递给Javascript

Question

I am using the jQuery post method to create a record in MySQL. When I evaluate the output of the PHP with == , all three conditionals work properly. However, when I use === , the first two conditionals return false . How do I pass the correct data type to Javascript from PHP?

jQuery:

$("#form").validate({

    submitHandler: function(form) {
        // do other stuff for a valid form
        $.post('inc/process_form.php', $("#form").serialize(), function(data) {
            //alert(data);
            if (data == 1) {
                $('#results').html("Success");
            } else if (data == 2) {
                $('#results').html("No Success");
            } else {
                $('#results').html(data);
            }
        });
    }
});

This is the PHP (which I've truncated to only show the execute conditional):

$value = $stmt->execute();

if ($value === TRUE) {
echo 1; //success
} else {
echo 2; //failure
}

Answer 1

try this:

if(parseInt(data) === 1){

The problem is the return variable data is a string, you can't do anything (as far as I know) from PHP to return it as a integer.

As the comment by Marc Costello suggested, this makes the === useless since you are forcing both sides to be integer, so data == 1 is better in this case.

Answer 2

I never needed something like this but if you really have to you can simply cast it using +data :

data = +data;
if (data === 1) {
     $('#results').html("Success");
} else if (data === 2) {
     $('#results').html("No Success");
}

Answer 3

在这种情况下，您可以传递布尔值而不是0或1，即php中的true或false