How to create an SVG “tooltip”-like box?

Given an existing valid SVG document, what's the best way to create "informational popups", so that when you hover or click on certain elements (let's say ) you popup a box with an arbitrary amount (i.e. not just a single line tooltip) of extra information?

This should display correctly at least in Firefox and be invisible if the image was rasterized to a bitmap format.

<svg>
  <text id="thingyouhoverover" x="50" y="35" font-size="14">Mouse over me!</text>
  <text id="thepopup" x="250" y="100" font-size="30" fill="black" visibility="hidden">Change me
    <set attributeName="visibility" from="hidden" to="visible" begin="thingyouhoverover.mouseover" end="thingyouhoverover.mouseout"/>
  </text>
</svg>

Further explanation can be found here.

This question was asked in 2008. SVG has improved rapidly in the intervening four years. Now tooltips are fully supported in all platforms I'm aware of. Use a <title> tag (not an attribute) and you will get a native tooltip.

Here are the docs: https://developer.mozilla.org/en-US/docs/SVG/Element/title

Since the <set> element doesn't work with Firefox 3, I think you have to use ECMAScript.

If you add the following script element into your SVG:

  <script type="text/ecmascript"> <![CDATA[

    function init(evt) {
        if ( window.svgDocument == null ) {
        // Define SGV
        svgDocument = evt.target.ownerDocument;
        }
        tooltip = svgDocument.getElementById('tooltip');
    }

    function ShowTooltip(evt) {
        // Put tooltip in the right position, change the text and make it visible
        tooltip.setAttributeNS(null,"x",evt.clientX+10);
        tooltip.setAttributeNS(null,"y",evt.clientY+30);
        tooltip.firstChild.data = evt.target.getAttributeNS(null,"mouseovertext");
        tooltip.setAttributeNS(null,"visibility","visible");
    }

    function HideTooltip(evt) {
        tooltip.setAttributeNS(null,"visibility","hidden");
    }
    ]]></script>

You need to add onload="init(evt)" into the SVG element to call the init() function.

Then, to the end of the SVG, add the tooltip text:

<text id="tooltip" x="0" y="0" visibility="hidden">Tooltip</text>

Finally, to each of the element that you want to have the mouseover function add:

onmousemove="ShowTooltip(evt)"
onmouseout="HideTooltip(evt)"
mouseovertext="Whatever text you want to show"

I've written a more detailed explanation with improved functionality at http://www.petercollingridge.co.uk/interactive-svg-components/tooltip

I haven't yet included multi-line tooltips, which would require multiple <tspan> elements and manual word wrapping.

Aravind Cheekkallur

This should work:

nodeEnter.append("svg:element")
   .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; })
   .append("svg:title")
   .text(function(d) {return d.Name+"\n"+d.Age+"\n"+d.Dept;}); // It shows the tool tip box with item [Name,Age,Dept] and upend to the svg dynamicaly

来源：https://stackoverflow.com/questions/102457/how-to-create-an-svg-tooltip-like-box

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