<style scoped>

#mychart {

margin:10px 10px 10px 10px;

width:90%;

max-width: 800px;

height:400px;

}

</style>

<div class="intro">

This example shows how to customize the default tooltip of a `Chart`.

</div>

<div class="example">

{{>charts-customizedtooltip-source}}

</div>

<h3>This example shows how to customize the tooltip for a `Chart`.</h3>

<p>A `Chart` instance comes with a simple default tooltip. This tooltip is represented by the `tooltip` attribute. Through the tooltip attribute you can do the following:

<ul>

<li>Style the tooltip background, border and text.</li>

<li>Customize and format the tooltip message.</li>

<li>Change the show and hide events.</li>

<li>Disable the tooltip.</li>

</ul>

</p>

<p>The `tooltip` attribute contains the following properties:

<ul>

<li>showEvent: event that should trigger the tooltip</li>

<li>hideEvent: event that should trigger the removal of a tooltip (can be an event or an array of events)</li>

<li>styles: hash of style properties that will be applied to the tooltip node</li>

<li>show: indicates whether or not to show the tooltip</li>

<li>markerEventHandler: displays and hides tooltip based on marker events</li>

<li>planarEventHandler: displays and hides tooltip based on planar events</li>

<li>markerLabelFunction: reference to the function used to format a marker event triggered tooltip's text</li>

<li>planarLabelFunction: reference to the function used to format a planar event triggered tooltip's text</li>

</ul>

</p>

<p>In this example, we have changed the styles and set a custom `markerLabelFunction` to format the text.</p>

```

var myDataValues = [

{category:"5/1/2010", Miscellaneous:2000, Expenses:3700, Revenue:2200},

{category:"5/2/2010", Miscellaneous:50, Expenses:9100, Revenue:100},

{category:"5/3/2010", Miscellaneous:400, Expenses:1100, Revenue:1500},

{category:"5/4/2010", Miscellaneous:200, Expenses:1900, Revenue:2800},

{category:"5/5/2010", Miscellaneous:5000, Expenses:5000, Revenue:2650}

];

var myTooltip = {

styles: {

backgroundColor: "#333",

color: "#eee",

borderColor: "#fff",

textAlign: "center"

},

markerLabelFunction: function(categoryItem, valueItem, itemIndex, series, seriesIndex)

{

var msg = "<span style=\"text-decoration:underline\">" + valueItem.displayName + " for " +

categoryItem.axis.get("labelFunction").apply(this, [categoryItem.value, categoryItem.axis.get("labelFormat")]) +

"</span><br/><div style=\"margin-top:5px;font-weight:bold\">" + valueItem.axis.get("labelFunction").apply(this, [valueItem.value, {prefix:"$", decimalPlaces:2}]) + "</div>";

return msg;

}

};

var mychart = new Y.Chart({

dataProvider:myDataValues,

type:"bar",

render:"#mychart",

tooltip: myTooltip

});

```