"zoom" A Browser Window/view With Javascript?

We can zoom in and out scrolling with pressing ctrl. But I want to do that using jQuery or JavaScript. Is is possible?

Solution 1:

Since you have tagged in jquery also (though written only js in the question title) I would add this answer

You can add the following css to a webpage to zoom a browser window

body {
   -moz-transform: scale(0.8, 0.8);
   zoom: 0.8;
   zoom: 80%;
}

So your jquery becomes

$(document).ready(function(){
  $('body').css('zoom','80%'); /* Webkit browsers */
  $('body').css('zoom','0.8'); /* Other non-webkit browsers */
  $('body').css('-moz-transform',scale(0.8, 0.8)); /* Moz-browsers */
});

Dont worry about any cross-browser since any incomprehensible css property would be avoided by the browser.

Solution 2:

Checkout this jsfiddle. Something you may use but it's not exact function like browser zoom-in zoom-out.

$('#zoom-in').click(function() {
   updateZoom(0.1);
});

$('#zoom-out').click(function() {
   updateZoom(-0.1);
});


zoomLevel = 1;

var updateZoom = function(zoom) {
   zoomLevel += zoom;
   $('body').css({ zoom: zoomLevel, '-moz-transform': 'scale(' + zoomLevel + ')' });
}

Solution 3:

Here is my solution using CSS transform: scale() and JavaScript / jQuery. This gets pretty close to browser zoom in / out:

<!-- Trigger --><ulid="zoom_triggers"><li><aid="zoom_in">zoom in</a></li><li><aid="zoom_out">zoom out</a></li><li><aid="zoom_reset">reset zoom</a></li></ul><script>jQuery(document).ready(function($)
    {
        // Set initial zoom levelvar zoom_level=100;

        // Click events
        $('#zoom_in').click(function() { zoom_page(10, $(this)) });
        $('#zoom_out').click(function() { zoom_page(-10, $(this)) });
        $('#zoom_reset').click(function() { zoom_page(0, $(this)) });

        // Zoom functionfunctionzoom_page(step, trigger)
        {
            // Zoom just to steps in or outif(zoom_level>=120 && step>0 || zoom_level<=80 && step<0) return;

            // Set / reset zoomif(step==0) zoom_level=100;
            else zoom_level=zoom_level+step;

            // Set page zoom via CSS
            $('body').css({
                transform: 'scale('+(zoom_level/100)+')', // set zoomtransformOrigin: '50% 0'// set transform scale base
            });

            // Adjust page to zoom widthif(zoom_level>100) $('body').css({ width: (zoom_level*1.2)+'%' });
            else $('body').css({ width: '100%' });

            // Activate / deaktivate trigger (use CSS to make them look different)if(zoom_level>=120 || zoom_level<=80) trigger.addClass('disabled');
            else trigger.parents('ul').find('.disabled').removeClass('disabled');
            if(zoom_level!=100) $('#zoom_reset').removeClass('disabled');
            else $('#zoom_reset').addClass('disabled');
        }
    });
</script>

Solution 4:

In IE:

alert(window.parent.document.body.style.zoom.toString());

and you can set the browser zoom

window.parent.document.body.style.zoom = 1.5;