Replacing InnerHTML

问题:

I have a HTML file, which is then calling a javascript file. Basic function of the javascript file is to draw a svg file, and do modifications on it. for example

I am embedding the svg image in my JS file like this

this.my_object.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><image xlink:href="img/gauge.png" width="122" height="127"/><g id="needle" transform="rotate(0,62,62)"><circle cx="62" cy="62" r="4" style="fill: #c00; stroke: none"/><rect transform="rotate(-130,62,62)" name="arrow"  x="58" y="38" width="8" height="24" style="fill: #c00; stroke: none"/><polygon transform="rotate(-130,62,62)" points="58,39,66,39,62,30,58,39" style="fill: #c00; stroke: none"/></g><text id="value" x="35" y="103" focusable="false" editable="no" style="stroke:none; fill:#fff; font-family: monospace; font-size: 12px"></text></svg>';

Now, according to this post Safari embeded SVG doctype

I cant inline svg image because then it wont work on safari. Now due to certain restrictions I cant embed svg file in html, it has to be accessed through javascript. Is there any way svg image can be used in javascript without using innerHTML, as finally the image has to be renedered on safari.

PS: This image has to be copied in the same folder when compiling. https://sphotos-b.xx.fbcdn.net/hphotos-snc6/179594_10150982737360698_1827200234_n.jpg

回答1:

I'm currently in Linux and can't test with Safari, but still will post the answer...

Try to do in this way.

HTML:

<div id="image-container"></div>​

JavaScript:

var container = document.getElementById('image-container'),
    image = document.createElement('img');
image.src = 'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><image xlink:href="img/gauge.png" width="122" height="127"/><g id="needle" transform="rotate(0,62,62)"><circle cx="62" cy="62" r="4" style="fill: #c00; stroke: none"/><rect transform="rotate(-130,62,62)" name="arrow"  x="58" y="38" width="8" height="24" style="fill: #c00; stroke: none"/><polygon transform="rotate(-130,62,62)" points="58,39,66,39,62,30,58,39" style="fill: #c00; stroke: none"/></g><text id="value" x="35" y="103" focusable="false" editable="no" style="stroke:none; fill:#fff; font-family: monospace; font-size: 12px"></text></svg>';
container.appendChild(image);
​

UPDATE #1 - data URI encoding:

The usage of unencoded data URI might be failed in IE 8 and 9.

So you can determine the browser using navigator.userAgent and if it's IE >= 8, then encode the string to Base64 before assigning it as value of image.src.

UPDATE #2 - using object tag:

var container = document.getElementById('image-container'),
    imageObject = document.createElement('object');
imageObject.type = 'image/svg+xml';
imageObject.data = 'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><image xlink:href="img/gauge.png" width="122" height="127"/><g id="needle" transform="rotate(0,62,62)"><circle cx="62" cy="62" r="4" style="fill: #c00; stroke: none"/><rect transform="rotate(-130,62,62)" name="arrow"  x="58" y="38" width="8" height="24" style="fill: #c00; stroke: none"/><polygon transform="rotate(-130,62,62)" points="58,39,66,39,62,30,58,39" style="fill: #c00; stroke: none"/></g><text id="value" x="35" y="103" focusable="false" editable="no" style="stroke:none; fill:#fff; font-family: monospace; font-size: 12px"></text></svg>';
container.appendChild(imageObject);

​You can set either the data URI or direct link to .svg file location.

object DEMO

UPDATE #3 - CSS approach:

var container = document.getElementById('image-container');
container.style.width = '100px';
container.style.height = '100px';
container.style.backgroundPosition = 'center';
container.style.backgroundImage = 'url(\'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><image xlink:href="img/gauge.png" width="122" height="127"/><g id="needle" transform="rotate(0,62,62)"><circle cx="62" cy="62" r="4" style="fill: #c00; stroke: none"/><rect transform="rotate(-130,62,62)" name="arrow"  x="58" y="38" width="8" height="24" style="fill: #c00; stroke: none"/><polygon transform="rotate(-130,62,62)" points="58,39,66,39,62,30,58,39" style="fill: #c00; stroke: none"/></g><text id="value" x="35" y="103" focusable="false" editable="no" style="stroke:none; fill:#fff; font-family: monospace; font-size: 12px"></text></svg>\')';

​

DEMO of CSS approach

UPDATE #4 - MIME type:

Comment by UnderDog:

I changed the datatype, and it worked.. but additionally I also had to configure web.config file to add this:

<staticContent><mimeMap fileExtension=".svg" mimeType="image/svg+xml" /></staticContent>

The server should send correct Content-Type header.