Javascript - 在结束函数之前等待单击

Question

I have made what is essentially a lightbox whereby if a change requires the user to confirm their password, this lightbox pops up and the user enters there password etc.

I am triggering the function like this:

if(verifyPassword())
{
    //apply change
}

The verify function is:

function verifyPassword() {
$('#confirmpasswordoverlay').fadeIn(300);

$('#submit').click(function() {
    $.post('', { password: $('input[name=password]').val() }, 
            function(check) {
                if(check.error)
                {
                    if(check.password)
                    {
                        //show password error
                        return false;
                    }
                    else
                    {
                        //show error
                        return false;
                    }
                }
                else
                {
                    return true;
                }
            }, 'json');
});

}

Basically I am needing the function to wait until #submit is clicked to return either true or false.

Thanks in advance

Answer 1

Since jQuery 1.5.0, you can do apply some magic with Deferred objects:

$.when( verifyPassword() ).done(function() {
    // do something
});

You would need to re-write verifyPassword() a little:

function verifyPassword() {
    var Notify = $.Deferred();
    $('#confirmpasswordoverlay').fadeIn(300);

    $('#submit').click(function() {
        $.post('', { password: $('input[name=password]').val() }, 
                function(check) {
                    if(check.error) {
                        if(check.password) {
                            //show password error
                            Notify.resolve();
                        }
                        else {
                            //show error
                            Notify.reject();
                        }
                    }
                    else {
                        return true;
                    }
                }, 'json');
        });

    return Notify.promise();
}

This might not be the most elegant way of achieving your goal here, I'm just saying you could do it in a way like this :-)