CODEWITHSUNDEEP
jquery
Gillian
Gillian

Reputation: 411

jquery, add/remove class when window width changes

I've written out a very basic script to add/remove a class on load or when a window is resized.

I was just wondering if there was a better way of doing this or if it is possible to reduce the lines of code.

Basically I want to be able to alter the styles when the site is viewed on a smaller screen. I thought it would be best to add a new class to the html tag when it went under a certain width...

Anyways here's my code.

<script type="text/javascript">
 $(document).ready( function() {
    /* Check width on page load*/
    if ( $(window).width() < 514) {
     $('html').addClass('mobile');
    }
    else {}
 });

 $(window).resize(function() {
    /*If browser resized, check width again */
    if ($(window).width() < 514) {
     $('html').addClass('mobile');
    }
    else {$('html').removeClass('mobile');}
 });

Thanks

Gillian

Upvotes: 28

Views: 103514

Answers (7)

Umar Tariq
Umar Tariq

Reputation: 1297

Try this. It works for me

function resize() {
        if ($(window).width() < 514) {}
        else {}
    }

    $(document).ready( function() {
        $(window).resize(resize);
        resize();
    });

Upvotes: 0

user3778154
user3778154

Reputation: 41

You Can also Use this Method I think its very clear to follow : 

$(window).on('resize', function(){
      var win = $(this);
      if (win.width() < 514) { 

      $('html').addClass('mobile');

      }
    else
    {
        $('html').removeClass('mobile');
    }

});

Simple Method

Upvotes: 4

William Schroeder McKinley
William Schroeder McKinley

Reputation: 768

This issue pestered me for a while, actually. I usually have multiple sizes for transitions. I wrote this an thought I'd share:

$(function() {
  var pageTransitions = [['full',1600],['mobile',800],['tiny',400],['micro',0]]; // number shows minimum size - must be from high to low
  function resize() {
    var target = 0,
        w = $(window).width(),
        h = $('html');
    $.each(pageTransitions, function(index, pageTransition) {
        if( w > pageTransition[1]) {
            target = index;
            return false;
        }
    });
    $.each(pageTransitions, function(index, pageTransition) {
        h.removeClass(pageTransition[0]);
    });
    h.addClass(pageTransitions[target][0]);
  }
  resize();
  jQuery(window).on('resize', function() {
    resize();
  });
});

http://jsfiddle.net/mckinleymedia/ERZ3q/7/

Upvotes: 2

iappwebdev
iappwebdev

Reputation: 5910

First of all, DRY (Don't Repeat Yourself) your code by using a function:

function checkWidth(init)
{
    /*If browser resized, check width again */
    if ($(window).width() < 514) {
        $('html').addClass('mobile');
    }
    else {
        if (!init) {
            $('html').removeClass('mobile');
        }
    }
}

$(document).ready(function() {
    checkWidth(true);

    $(window).resize(function() {
        checkWidth(false);
    });
});

Upvotes: 16

Rab
Rab

Reputation: 35582

Use Media classes

@media screen and (max-width: 900px) {
  .class {
    width:800px;

  }
}

@media screen and (max-width: 500px) {
      .class {
        width:450px;

  }
}

Upvotes: 16

Jared Farrish
Jared Farrish

Reputation: 49238

Well, I know I'm late to the party, but I saw some things like $(document).ready() that weren't really necessary.

Try to cache your selectors if you're calling them over and over again, a la var $window = $(window); This will help with performance. I use a function expression to encapsulate to I stay out of the global scope but still have access to my $window and $html cached jQuery selected elements.

(function($) {
    var $window = $(window),
        $html = $('html');

    $window.resize(function resize(){
        if ($window.width() < 514) {
            return $html.addClass('mobile');
        }

        $html.removeClass('mobile');
    }).trigger('resize');
})(jQuery);

http://jsfiddle.net/userdude/rzdGJ/1

Probably a little cleaner, little easier to follow:

(function($) {
    var $window = $(window),
        $html = $('html');

    function resize() {
        if ($window.width() < 514) {
            return $html.addClass('mobile');
        }

        $html.removeClass('mobile');
    }

    $window
        .resize(resize)
        .trigger('resize');
})(jQuery);

http://jsfiddle.net/userdude/rzdGJ/2

Upvotes: 57

Ananth
Ananth

Reputation: 4407

function resize() {
    if ($(window).width() < 514) {
     $('html').addClass('mobile');
    }
    else {$('html').removeClass('mobile');}
}

$(document).ready( function() {
    $(window).resize(resize);
    resize();
});

Upvotes: 8

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