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<!DOCTYPE html>
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<meta charset="utf-8">
<title>JSDoc: Namespace: Observable</title>
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="fabric.ActiveSelection.html">ActiveSelection</a></li><li><a href="fabric.BaseBrush.html">BaseBrush</a></li><li><a href="fabric.Canvas.html">Canvas</a></li><li><a href="fabric.Circle.html">Circle</a></li><li><a href="fabric.CircleBrush.html">CircleBrush</a></li><li><a href="fabric.Color.html">Color</a></li><li><a href="fabric.Ellipse.html">Ellipse</a></li><li><a href="fabric.Gradient.html">Gradient</a></li><li><a href="fabric.Group.html">Group</a></li><li><a href="fabric.Image.html">Image</a></li><li><a href="fabric.Image.filters.BaseFilter.html">BaseFilter</a></li><li><a href="fabric.Image.filters.Blur.html">Blur</a></li><li><a href="fabric.Image.filters.Brightness.html">Brightness</a></li><li><a href="fabric.Image.filters.ColorMatrix.html">ColorMatrix</a></li><li><a href="fabric.Image.filters.Contrast.html">Contrast</a></li><li><a href="fabric.Image.filters.Convolute.html">Convolute</a></li><li><a href="fabric.Image.filters.fabric.Image.filter.BlendColor.html">BlendColor</a></li><li><a href="fabric.Image.filters.fabric.Image.filter.BlendImage.html">BlendImage</a></li><li><a href="fabric.Image.filters.Gamma.html">Gamma</a></li><li><a href="fabric.Image.filters.Grayscale.html">Grayscale</a></li><li><a href="fabric.Image.filters.HueRotation.html">HueRotation</a></li><li><a href="fabric.Image.filters.Invert.html">Invert</a></li><li><a href="fabric.Image.filters.Noise.html">Noise</a></li><li><a href="fabric.Image.filters.Pixelate.html">Pixelate</a></li><li><a href="fabric.Image.filters.RemoveColor.html">RemoveColor</a></li><li><a href="fabric.Image.filters.Resize.html">Resize</a></li><li><a href="fabric.Image.filters.Saturation.html">Saturation</a></li><li><a href="fabric.Intersection.html">Intersection</a></li><li><a href="fabric.IText.html">IText</a></li><li><a href="fabric.Line.html">Line</a></li><li><a href="fabric.Object.html">Object</a></li><li><a href="fabric.Path.html">Path</a></li><li><a href="fabric.Pattern.html">Pattern</a></li><li><a href="fabric.PatternBrush.html">PatternBrush</a></li><li><a href="fabric.PencilBrush.html">PencilBrush</a></li><li><a href="fabric.Point.html">Point</a></li><li><a href="fabric.Polygon.html">Polygon</a></li><li><a href="fabric.Polyline.html">Polyline</a></li><li><a href="fabric.Rect.html">Rect</a></li><li><a href="fabric.Shadow.html">Shadow</a></li><li><a href="fabric.SprayBrush.html">SprayBrush</a></li><li><a href="fabric.StaticCanvas.html">StaticCanvas</a></li><li><a href="fabric.Text.html">Text</a></li><li><a href="fabric.Textbox.html">Textbox</a></li><li><a href="fabric.Triangle.html">Triangle</a></li></ul><h3>Namespaces</h3><ul><li><a href="fabric.html">fabric</a></li><li><a href="fabric.Collection.html">Collection</a></li><li><a href="fabric.CommonMethods.html">CommonMethods</a></li><li><a href="fabric.Image.filters.html">filters</a></li><li><a href="fabric.Observable.html">Observable</a></li><li><a href="fabric.util.html">util</a></li><li><a href="fabric.util.array.html">array</a></li><li><a href="fabric.util.ease.html">ease</a></li><li><a href="fabric.util.object.html">object</a></li><li><a href="fabric.util.string.html">string</a></li></ul><h3>Global</h3><ul><li><a href="global.html#__cachedLines">__cachedLines</a></li><li><a href="global.html#_splitTextIntoLines">_splitTextIntoLines</a></li><li><a href="global.html#_wrapLine">_wrapLine</a></li><li><a href="global.html#_wrapText">_wrapText</a></li><li><a href="global.html#applyFilters">applyFilters</a></li><li><a href="global.html#copyGLTo2DDrawImage">copyGLTo2DDrawImage</a></li><li><a href="global.html#copyGLTo2DPutImageData">copyGLTo2DPutImageData</a></li><li><a href="global.html#dynamicMinWidth">dynamicMinWidth</a></li><li><a href="global.html#initialize">initialize</a></li><li><a href="global.html#isEndOfWrapping">isEndOfWrapping</a></li><li><a href="global.html#lockScalingFlip">lockScalingFlip</a></li><li><a href="global.html#minWidth">minWidth</a></li><li><a href="global.html#noScaleCache">noScaleCache</a></li><li><a href="global.html#styleHas">styleHas</a></li><li><a href="global.html#toObject">toObject</a></li><li><a href="global.html#type">type</a></li></ul>
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<div id="main">
<h1 class="page-title">Namespace: Observable</h1>
<section>
<header>
<h2>
<span class="ancestors"><a href="fabric.html">fabric</a>.</span>Observable</h2>
</header>
<article>
<div class="container-overview">
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line268">line 268</a>
</li></ul></dd>
<dt class="tag-tutorial">Tutorials:</dt>
<dd class="tag-tutorial">
<ul>
<li><em class="disabled">Tutorial: <a href="http://fabricjs.com/fabric-intro-part-2#events">http://fabricjs.com/fabric-intro-part-2#events</a></em></li>
</ul>
</dd>
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="http://fabricjs.com/events">Events demo</a></li>
</ul>
</dd>
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="off"><a href="#off" ><span class="type-signature"></span>off<span class="signature">(eventName, handler)</span><span class="type-signature"> → {Self}</span></a></h4>
<div class="description">
Stops event observing for a particular event handler. Calling this method
without arguments removes all handlers for all events
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>eventName</code></td>
<td class="type">
<span class="param-type">String</span>
|
<span class="param-type">Object</span>
</td>
<td class="description last">Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})</td>
</tr>
<tr>
<td class="name"><code>handler</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last">Function to be deleted from EventListeners</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="important tag-deprecated">Deprecated:</dt><dd><ul class="dummy"><li>`stopObserving` deprecated since 0.8.34 (use `off` instead)</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line216">line 216</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
thisArg
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Self</span>
</dd>
</dl>
<h4 class="name" id="on"><a href="#on" ><span class="type-signature"></span>on<span class="signature">(eventName, handler)</span><span class="type-signature"> → {Self}</span></a></h4>
<div class="description">
Observes specified event
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>eventName</code></td>
<td class="type">
<span class="param-type">String</span>
|
<span class="param-type">Object</span>
</td>
<td class="description last">Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})</td>
</tr>
<tr>
<td class="name"><code>handler</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last">Function that receives a notification when an event of the specified type occurs</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="important tag-deprecated">Deprecated:</dt><dd><ul class="dummy"><li>`observe` deprecated since 0.8.34 (use `on` instead)</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line186">line 186</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
thisArg
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Self</span>
</dd>
</dl>
<h4 class="name" id="trigger"><a href="#trigger" ><span class="type-signature"></span>trigger<span class="signature">(eventName, options<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {Self}</span></a></h4>
<div class="description">
Fires event with an optional options object
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>eventName</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="attributes">
</td>
<td class="description last">Event name to fire</td>
</tr>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last">Options object</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="important tag-deprecated">Deprecated:</dt><dd><ul class="dummy"><li>`fire` deprecated since 1.0.7 (use `trigger` instead)</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line249">line 249</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
thisArg
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Self</span>
</dd>
</dl>
</article>
</section>
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