How to create an SVG "tooltip"-like box?

morais_2846 0
Viewed 67377

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.

popup tooltip svg
4 Answers
<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.

user_136750

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.

user_5669200
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