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JavaScript

Posted by S K
S K
Courses Plus Student 3,106 Points

JQuery containsBlank function

Hello treepeople, Can some one demystify the containsBlacnk Function found on the java script tutorial :http://teamtreehouse.com/library/websites/build-an-interactive-website/form-validation-and-manipulation/checking-values.

Our goal is to see whether the required values are empty or not I can boil down my understanding to : the code checks If(val()==""), and push the results (true or false) into the array. I dont get how the if statement checks inside the each method for true or false and pushes the result into an array.

Regards S

1 Answer

Andrew Chalkley
STAFF
Andrew Chalkley
Treehouse Guest Teacher
Andrew Chalkley
Andrew Chalkley
Treehouse Guest Teacher

The each() method cycles over all required fields i.e. with the class of .required.

$required.each(function(){

});

The $(this).val() retrieves the value for the current required field it's looping over. By using a conditional operator like == it will make the line now return a boolean value. So $(this).val() == "" will equal either true or false. That's how conditional statements work in an if condition.

So instead of doing this...

$required.each(function(){
    if($(this).val() == "") {
      blanks.push(true);
    } else {
      blanks.push(false);          
    }
});

... we can do it less verbose like this, since the condition we're testing for is going to be stored in an array.

$required.each(function(){
    blanks.push($(this).val() == "");
});

Does that make any more sense?

Regards, Andrew