Example: Dial With a Surrounding Image

This example shows how to create a Dial widget using an image that surrounds (or is larger than) the Dial.

Creating a Dial and Surrounding It With a Larger Image

Some cases may require a Dial that has an image surrounding it such as tick marks, units, or other visual enhancements. These images can be larger than the ring of the dial and therefore may not fit as a background image. To provide for this use case, an extra image object will need to be added to the DOM.

In this example we'll simulate the climate control on an car dashboard. The image we'll add contains two curved wedges of color, blue and red, that wrap around the dial, signifying the temperature of air conditioning or heat.

The Markup

Note: be sure to add the yui3-skin-sam classname to the page's <body> element or to a parent element of the widget in order to apply the default CSS skin. See Understanding Skinning.

<body class="yui3-skin-sam"> <!-- You need this skin class -->

The only markup requirement is a div to contain the Dial.

<div id="demo"></div>

The JavaScript

The same JavaScript can be used as in the basic Dial example, with a bit of extra code to add the image object.

Some commonly used configuration attributes are shown below. This example also shows how to modify the visible UI strings before the Dial renders.

YUI().use('dial', function(Y) {

    var dial = new Y.Dial({
        min: -90,
        max: 90,
        stepsPerRevolution: 200,
        value: 0,
        diameter: 100
    });
    //Setting visible HTML strings before Dial renders.
    dial.set('strings',{'label':'Climate:', 'resetStr':'Off', 'tooltipHandle':'Drag for cool or heat.'});
    dial.render("#demo");

});

Inserting the Image

After rendering the Dial, we create and insert the image object.

//Create an image node.
var im = Y.Node.create('<img src="http://yuilibrary.com/yui/docs/assets/dial/images/cold_hot.png"/>');
    
//Position it absolutely to the correct spot depending on it's size.
im.setStyles({'position':'absolute', 'top':'-3px', 'left':'-9px'});
    
//Insert it in the DOM.
//The north-mark is the first object inside the ring.
//depending on the image, you may need to insert it before the yui3-dial-label 
Y.one('.yui3-dial-north-mark').insert(im, 'before');

The CSS

In the CSS, we're just cleaning out the visible styles of the ring and the center button to allow for the images.

Complete Example Source

<!DOCTYPE HTML>
<html>
<script src="http://yui.yahooapis.com/3.8.0/build/yui/yui-min.js"></script>

<style>
/* Adding some margin to allow for the image */
.yui3-dial{
    margin:0 0 20px 20px;
}

/* Here, we are just cleaning out the visible 
styles of the ring and the center button 
to allow for the images. */

/* Remove visible styles of the ring */
.yui3-skin-sam .yui3-dial-content .yui3-dial-ring{
    box-shadow: none;
    -moz-border-radius: none;
    -webkit-border-radius: none;
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    background:none;
}

/* Remove visible style of the center button */
.yui3-skin-sam .yui3-dial-content .yui3-dial-center-button {
    box-shadow: none;
    -moz-border-radius: none;
    -webkit-border-radius: none;
    -moz-box-shadow: none;
    background:none;
}

/* Hide all VML ovals in IE. */
.yui3-skin-sam .yui3-dial-ring-vml v\:oval {
    visibility:hidden;
}

/* Show the marker and the handle ovals */
.yui3-skin-sam .yui3-dial-ring-vml .yui3-dial-marker-vml v\:oval,
.yui3-skin-sam .yui3-dial-ring-vml .yui3-dial-handle-vml v\:oval {
    visibility:visible;
}

/* Fill center button and ring so their backgrounds accept events in IE */
.yui3-skin-sam .yui3-dial-content .yui3-dial-center-button-vml,
.yui3-skin-sam .yui3-dial-content .yui3-dial-ring-vml{
    background:url(../assets/dial/images/empty.png);
}
</style>

<body class="yui3-skin-sam"> <!-- You need this skin class -->
    <div id="demo"></div>
</body>

<script>
YUI().use('dial', function(Y) {
    
    var dial = new Y.Dial({
        min: -90,
        max: 90,
        stepsPerRevolution: 200,
        value: 0,
        diameter: 100
    });
    dial.set('strings',{'label':'Climate:', 'resetStr':'Off', 'tooltipHandle':'Drag for cool or heat.'});
    dial.render('#demo');
    
    var im = Y.Node.create('<img src="http://yuilibrary.com/yui/docs/assets/dial/images/cold_hot.png"/>');
    im.setStyles({'position':'absolute', 'top':'-3px', 'left':'-9px'});
    Y.one('.yui3-dial-north-mark').insert(im, 'before');
    
});
</script>
</html>