requiredFilledIn() true !?

Question

Hello there is something I don't fully understand with this piece of code taken from "build an interactive website". It's about the requiredFilledIn() function as stated in the title.

Inside this function, there is a little check if(true)... disable the submit button. That's ok, nothing difficult.

This function is then called as well at the end of the page, this way, once the page is loaded, the function is called and the checking is done.

Thus, the submit button is disabled, because It seems to be "true".

But what I don't get is, what's "true" ? As there is no comparison or anything else... How could it be "true" ? For me, there is no true or false value at this stage, at least in my mind.

Shall I consider that, as there is nothing, no testing with the if, the result will be automatically true ? And so in this case the submit button is disabled as the code gets executed ?

Same with the keyup event, where we call the requireFilledIn() function ?

 var $submit = $(".submit input");

        function requiredFilledIn(){

             if(true){
                 $submit.attr("disabled","disabled");
             }
             else
             {
                $submit.removeAttr("disabled");
             }
        };

        $("#form span").hide();

        $("input, textarea").focus(function(){
            $(this).next().fadeIn("slow");
        })
        .blur(function(){
           $(this).next().fadeOut("slow"); 
        })
        .keyup(function(){
            //Check all required fields.
            requiredFilledIn();
        });

        // CHECK IF EMAIL ADRESS IS CORRECT

        $("#email").keyup(function(){
            if(false){
                $(this).next().removeClass("error").addClass("valid");

            }
            else
            {
                $(this).next().removeClass("valid").addClass("error");            


            }
        });

        requiredFilledIn(); 

    ```

Answer 1 · 2014-06-10T11:44:46Z

June 10, 2014 11:44am

In this situation "true" is always boolean True and "false" is always a boolean False.

"Shall I consider that, as there is nothing, no testing with the if, the result will be automatically true ? And so in this case the submit button is disabled as the code gets executed ?" - yes, you are right.

Answer 2 · 2014-06-10T13:32:40Z

June 10, 2014 1:32pm

Thank you for your answer.

Welcome to the Treehouse Community

Looking to learn something new?

geoffrey

geoffrey

requiredFilledIn() true !?

2 Answers

Kazimierz Matan

Kazimierz Matan

geoffrey

geoffrey