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JavaScript jQuery Basics (2014) Creating a Password Confirmation Form Perform: Part 1

Oğulcan Girginc
Oğulcan Girginc
24,848 Points
Posted by Oğulcan Girginc
Oğulcan Girginc
24,848 Points

How does $(this) is linked to $("#password")?

How come this keyword knows that it is linked to #password, since the function that has this keyword was written before the #password? 

$('form span').hide();

function passwordEvent(){
  if($(this).val().length > 8) {    
     $(this).next().hide();
  } else {   
     $(this).next().show();
    }
}

$('#password').focus(passwordEvent).keyup(passwordEvent);

2 Answers

Jorge Septien
Jorge Septien
20,339 Points
Jorge Septien
Jorge Septien
20,339 Points

You are binding the passwordEvent handler to the focus and keyup events on the #password element. The this keyword always refers to the owner of the method, in this case the selected #password element. The code in the handler will only run when the events are triggered.

kareem Pierre
seal-mask
PLUS
.a{fill-rule:evenodd;}techdegree
kareem Pierre
Full Stack JavaScript Techdegree Student 20,263 Points
kareem Pierre
.a{fill-rule:evenodd;}techdegree
kareem Pierre
Full Stack JavaScript Techdegree Student 20,263 Points

I recommend reading up on JavaScript hoisting, scope, and context. This will explain what is happening above. A good set of videos i recommend can be found here: https://www.youtube.com/channel/UCVTlvUkGslCV_h-nSAId8Sw just check out the javascript section, he does a very good job explaining.