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Changing the browser zoom level

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野的像风
野的像风 2020-11-22 07:00

I have need to create 2 buttons on my site that would change the browser zoom level (+) (-). I\'m requesting browser zoom and not css zoom because of image size and layout i

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8条回答
  • 被撕碎了的回忆
    2020-11-22 07:11

    You can use the CSS3 zoom function, but I have not tested it yet with jQuery. Will try now and let you know. UPDATE: tested it, works but it's fun

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  • 一生所求
    2020-11-22 07:14

    Possible in IE and chrome although it does not work in firefox:

    <script>
   function toggleZoomScreen() {
       document.body.style.zoom = "80%";
   } 
</script>

<img src="example.jpg" alt="example" onclick="toggleZoomScreen()">
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  • 无人共我
    2020-11-22 07:16 

    <html>
  <head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
        <script>
        var currFFZoom = 1;
        var currIEZoom = 100;

        function plus(){
            //alert('sad');
                var step = 0.02;
                currFFZoom += step;
                $('body').css('MozTransform','scale(' + currFFZoom + ')');
                var stepie = 2;
                currIEZoom += stepie;
                $('body').css('zoom', ' ' + currIEZoom + '%');

        };
        function minus(){
            //alert('sad');
                var step = 0.02;
                currFFZoom -= step;
                $('body').css('MozTransform','scale(' + currFFZoom + ')');
                var stepie = 2;
                currIEZoom -= stepie;
                $('body').css('zoom', ' ' + currIEZoom + '%');
        };
    </script>
    </head>
<body>
<!--zoom controls-->
                        <a id="minusBtn" onclick="minus()">------</a>
                        <a id="plusBtn" onclick="plus()">++++++</a>
  </body>
</html>

    in Firefox will not change the zoom only change scale!!!

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  • 一整个雨季
    2020-11-22 07:18

    Try if this works for you. This works on FF, IE8+ and chrome. The else part applies for non-firefox browsers. Though this gives you a zoom effect, it does not actually modify the zoom value at browser level.

        var currFFZoom = 1;
    var currIEZoom = 100;

    $('#plusBtn').on('click',function(){
        if ($.browser.mozilla){
            var step = 0.02;
            currFFZoom += step; 
            $('body').css('MozTransform','scale(' + currFFZoom + ')');
        } else {
            var step = 2;
            currIEZoom += step;
            $('body').css('zoom', ' ' + currIEZoom + '%');
        }
    });

    $('#minusBtn').on('click',function(){
        if ($.browser.mozilla){
            var step = 0.02;
            currFFZoom -= step;                 
            $('body').css('MozTransform','scale(' + currFFZoom + ')');

        } else {
            var step = 2;
            currIEZoom -= step;
            $('body').css('zoom', ' ' + currIEZoom + '%');
        }
    });
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  • 余生分开走
    2020-11-22 07:24

    I could't find a way to change the actual browser zoom level, but you can get pretty close with CSS transform: scale(). Here is my solution based on JavaScript and jQuery:

    <!-- Trigger -->
<ul id="zoom_triggers">
    <li><a id="zoom_in">zoom in</a></li>
    <li><a id="zoom_out">zoom out</a></li>
    <li><a id="zoom_reset">reset zoom</a></li>
</ul>

<script>
    jQuery(document).ready(function($)
    {
        // Set initial zoom level
        var 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 function
        function zoom_page(step, trigger)
        {
            // Zoom just to steps in or out
            if(zoom_level>=120 && step>0 || zoom_level<=80 && step<0) return;

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

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

            // Adjust page to zoom width
            if(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>
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  • 野趣味
    2020-11-22 07:28

    Not possible in IE, as the UI Zoom button in the status bar is not scriptable. YMMV for other browsers.

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