What would make Internet Explorer NOT process conditional comments properly?
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14-11-2019 - |
Question
I'm writing JSP pages and using Tomcat, and it needs to work for IE 7 in addition to Firefox and Chrome (client needs).
In my program, I include both pieces of code. It works properly for non-IE browsers.
My problem is that CODE A does not work properly for IE, in that it treats it like a comment rather than a conditional comment that it should be reading. Any idea why this would happen and how to fix it?
<script type="text/javascript">
...
<!-- CODE A -->
<!--[if IE]>
url = "http://" + "..." + "&var=1";
<![endif]-->
<!-- CODE B -->
<!--[if !IE]> -->
url = "http://" + "..." + "&var=1";
<!-- <![endif]-->
...
</script>
Solution
Conditional HTML comments only work in HTML. JavaScript is not HTML. Rather use conditional JS comments in JS:
var IE = /*@cc_on!@*/false;
(only IE will interpret the !
which effectively makes it true
)
Then you can use it as follows
if (IE) {
url = "http://" + "..." + "&var=1";
} else {
url = "http://" + "..." + "&var=1";
}
Feature detection should however be preferred in JS.
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