JavaScript Hide/show elements using only Javascript without messing with DOM hide show elements javascript,hide/show elements when checkbox is

Just wondering, is it possible to use only Javascript to hide/show elements without using "style" method? So I won't have to use any inline CSS in my HTML element. Or even, how does jQuery perform the hide/show event in its core?

Answer:1

You can do it by adding/removing a CSS class with both Javascript and Jquery.

Assuming this is the CSS class that gets added to the DOM element:

.hide { display: none}

Then you can use:

Javascript v1

function toggleClass(element, className){
  if (!element || !className){
    return;
  }

  var classString = element.className, nameIndex = classString.indexOf(className);
  if (nameIndex == -1) {
    classString += ' ' + className;
  }
  else {
    classString = classString.substr(0, nameIndex) + classString.substr(nameIndex+className.length);
  }
  element.className = classString;
}

Javascript v2 (classList.toggle() supported by most modern browsers)

document.getElementById('foo').classList.toggle('hide');

jQuery

$('#foo').toggleClass('hide');
Answer:2

jQuery does it by manipulating styles.

There are many ways to manipulate the DOM:

  • manipulating the style attribute
  • adding/removing a class with some styles
  • just plain adding/removing an element from the DOM itself
  • etc.

But it all involves manipulating the DOM in some fashion, because that is what the browser renders.

Answer:3

You can toggle CSS classes that will hide / show the elements for you. You have to manipulate the DOM in any case, though.

.hidden {
   display: none;
}

document.getElementById("foo").className += " hidden";
Answer:4

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