How to show tooltip for text in SVG?

问题:

I need a tooltip when the user hovers over text in SVG. Also, the text and the tooltip content should be modifiable with javascript.

The following works in Firefox but not Chrome. What's the correct way to do this?

HTML:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="100" height="100">
    <rect width="100" height="100" style="fill:black;stroke-width:0"></rect>
    <text id="text1" x="50" y="15" text-anchor="end">text1</text>
    <text id="text2" x="80" y="15" text-anchor="end"
      transform="translate(0,50)">text2</text>
</svg>

Javascript (with jQuery):

$('#text1').attr('title', 'Tooltip 1');
$('#text2').attr('title', 'Tooltip 2');

My jsfiddle: http://jsfiddle.net/getvictor/ctaVA/

回答1:

A title child element will act as a tooltip.

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="100" height="100">
    <rect width="100" height="100" style="fill:black;stroke-width:0"></rect>
    <text id="text1" x="50" y="15" text-anchor="end"><title>Tooltip 1</title>text1</text>
    <text id="text2" x="80" y="15" text-anchor="end"
      transform="translate(0,50)"><title>Tooltip 2</title>text2</text>
</svg>

回答2:

You can use the <title> element.

Note that those implementations that do use <title> to display a tooltip often will only do so if the <title> is indeed the first child element of its parent.

From https://developer.mozilla.org/en/docs/Web/SVG/Element/title

So, in your example, that would be

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="100" height="100">
   <title id="title1">This is a tooltip</title>
   <rect width="100" height="100" style="fill:black;stroke-width:0"></rect>
   ...