70 lines
2.7 KiB
Markdown
70 lines
2.7 KiB
Markdown
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A simple [Material Design](https://www.google.com/design/spec/material-design/introduction.html) gauge control implemented in pure CSS/HTML. Includes a JavaScript implementation to change the gauge value dynamically.
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Origin: https://github.com/sathomas/material-gauge
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Check out the [live example](http://sathomas.me/material-gauge/).
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The basic markup for the gauge is as follows:
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```
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<div class="gauge" id="myGauge">
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<div class="gauge__container">
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<div class="gauge__marker"></div>
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<div class="gauge__background"></div>
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<div class="gauge__center"></div>
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<div class="gauge__data"></div>
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<div class="gauge__needle"></div>
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</div>
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<div class="gauge__labels mdl-typography__headline">
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<span class="gauge__label--low">No</span>
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<span class="gauge__label--spacer"></span>
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<span class="gauge__label--high">Yes</span>
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</div>
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</div>
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```
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The gauge value is specified by `transform:` property on both the `.gauge__data` and `.gauge__needle` elements. The value for the rotation is
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`0.5 × X - 0.5` turns, where `X` ranges from 0 (left-most position) to 1 (right-most position). For example, to set the gauge at "3/4 full", you can specify the `transform` as
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```
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.gauge__data {
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-webkit-transform: rotate(-0.125turn);
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-moz-transform: rotate(-0.125turn);
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-ms-transform: rotate(-0.125turn);
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-o-transform: rotate(-0.125turn);
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transform: rotate(-0.125turn);
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}
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.gauge__needle {
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-webkit-transform: rotate(-0.125turn);
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-moz-transform: rotate(-0.125turn);
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-ms-transform: rotate(-0.125turn);
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-o-transform: rotate(-0.125turn);
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transform: rotate(-0.125turn);
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}
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```
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As the example indicates, you probably want to use vendor prefixes for maximum compatibility.
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If you wish, you can use the included JavaScript component to set and update the gauge value. The component API is quite simple. First, create a new object:
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var gauge = new Gauge();
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You can optionally pass a DOM element (constructed as above) to the constructor:
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var gauge = new Gauge(document.getElementById("myGauge"));
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If you don't pass the DOM element as a constructor parameter, you can initialize it later using the `element()` method:
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gauge.element(document.getElementById("myGauge"));
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> Note that the component will not construct the DOM element itself. You must supply a pre-constructed element with the sub-elements indicated above.
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Once you have an initialized constructor, set the value (between 0 and 1) using the `value()` method:
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gauge.value(0.75);
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As a final enhancement, if you're going to update the gauge live on the page, you can add the `gauge--liveupdate` class to the parent element. This will enable a nice CSS-based animation for value updates.
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