Utilizing HTML and JavaScript to dynamically switch stylesheets based on the width of

When it comes to using stylesheets for mobile and non-mobile devices, there is a need for different approaches. The idea of comparing browser height and width in JavaScript seems like a good one, but the implementation may not always work as expected.

    <script type="text/javascript">
function applyStyle() {
var $ = document; // shortcut
var mobile = 'mobile';  // encoding css path for id generation
var desktop = 'desktop';  //encoding css path for id generation
    if ($(window).height() > $(window).width()) {
    var head  = $.getElementsByTagName('head')[0];
    var link  = $.createElement('link');
    link.id   = mobile;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'css/interfacemobile.css';
    head.appendChild(link);
}
else {
    var head  = $.getElementsByTagName('head')[0];
    var link  = $.createElement('link');
    link.id   = desktop;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'css/interface.css';
    head.appendChild(link);
}}
</script>

</head>

<body>
<script type="text/javascript">
    applyStyle();
    </script>

If errors occur, such as improper script calling, it can be frustrating, especially for those less experienced with JavaScript. Any help on this matter is greatly appreciated!

Edit: The attempt has been adjusted:

<script type="text/javascript">
function checkStyle() {
//checking for mobile device
var check = false;
(function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4)))check = true})(navigator.userAgent||navigator.vendor||window.opera);
return check; 
}
</script>
<script type="text/javascript">
function applyStyle() {
    if (checkStyle()) {
    var head  = $.getElementsByTagName('head')[0];
    var link  = $.createElement('link');
    link.id   = mobile;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'css/interfacemobile.css';
    head.appendChild(link);
}
else {
    var head  = $.getElementsByTagName('head')[0];
    var link  = $.createElement('link');
    link.id   = desktop;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'css/interface.css';
    head.appendChild(link);
}
}
</script>
</head>

<body>
<script type="text/javascript">
    applyStyle();
    </script>

Despite efforts made, the functionality seems to be ineffective. What could be going wrong? TT_TT

Edit: A working solution that I found effective involves:

<script type="text/javascript">
function isMobile() {
//checking for mobile devices
var check = false;
(function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4)))check = true})(navigator.userAgent||navigator.vendor||window.opera);
return check; 
}
</script>
<script type="text/javascript">
var $ = document; //shortcut
var mobile = 'mobile';  //encode css path for id generation
var desktop = 'desktop';  //encode css path for id generation
function applyStyle() {
    if (isMobile()) {
    var head  = $.getElementsByTagName('head')[0];
    var link  = $.createElement('link');
    link.id   = mobile;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'css/interfacemobile.css';
    head.appendChild(link);
}
else {
    var head  = $.getElementsByTagName('head')[0];
    var link  = $.createElement('link');
    link.id   = desktop;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'css/interface.css';
    head.appendChild(link);
}
}
</script>
</head>

<body>
<script type="text/javascript">
    applyStyle();
    </script>

Appreciation goes out to all who have contributed to finding a solution!

javascripthtmlcssstylesheet

Answer №1

There seems to be a mistake here:

var $ = document; // shortcut

and next,

if ($(window).height() > $(window).width()) {

You have assigned $ as document, but treating it like jQuery.

Consider using window.innerHeight and window.innerWidth

Answer №2

If you're looking to make your website responsive, CSS media queries are the way to go:

<link rel="stylesheet" media="screen and (min-device-width: 700px)" href="css/narrow.css" />
<link rel='stylesheet' media='screen and (min-width: 701px) and (max-width: 900px)' href='css/medium.css' />
<link rel="stylesheet" media="screen and (max-device-width: 901px)" href="css/narrow.css" />

But if for some reason you prefer using JavaScript, here's an alternative:

function adjustStyle(width) {
    width = parseInt(width);
    
    if (width < 701) {
        $("#size-stylesheet").attr("href", "css/narrow.css");
    } else if ((width >= 701) && (width < 900)) {
        $("#size-stylesheet").attr("href", "css/medium.css");
    } else {
       $("#size-stylesheet").attr("href", "css/wide.css"); 
    }
}

$(function() {
    adjustStyle($(this).width());
    
    $(window).resize(function() {
        adjustStyle($(this).width());
    });
});

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