i have a question when a .php file called as a javascript what dose this mean? and when this is needed to be used ?
ex:
<head>
<script src="dir/myphpfile.php" type="text/javascript"></script>
</head>
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1This is essentially how JSON-P works.TheZ– TheZ2012-07-10 06:59:45 +00:00Commented Jul 10, 2012 at 6:59
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@TheZ no particular reson to assume Json being returned. It could just as easily be a way tu return all script in one request or to include server vars in a script.mplungjan– mplungjan2012-07-10 07:03:27 +00:00Commented Jul 10, 2012 at 7:03
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@mplungjan The PHP call to the server will return Javascript (be it static or dynamic) lest it throw an error in the browser. JSON-P is just JSON that has been wrapped up to look like Javascript so that the browser can load it in from any domain.TheZ– TheZ2012-07-10 07:05:22 +00:00Commented Jul 10, 2012 at 7:05
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I know this. I would rarely expect JSON in a script tag, just normal scripts. Most JSONP I have seen is invoked using appends to the headmplungjan– mplungjan2012-07-10 07:09:10 +00:00Commented Jul 10, 2012 at 7:09
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2 Answers
This means that the myphpfile.php would generate javascript code as output instead of HTML because that's all that the web browser could understand in a script tag. It is useful in situations when you want to generate dnyamic javascript at runtime instead of statically coding it in a separate .js file. Think for example declaring a javascript variable containing the list of customers stored in a database on the server and making this javascript variable globally accessible.
Another common example where this could be useful is to implement JSONP allowing cross domain AJAX requests.
Yet another example is to use a php script that will combine and cache the output of multiple javascript files into one.
3 Comments
Florian Brinker
Or if you want to combine multiple JS files via PHP into one file to get less http requests for mobile phones for example.
Darin Dimitrov
@Asto, excellent example. I have updated my answer to include it. Thanks for pointing this out.
Darin Dimitrov
@aadiahg, do you have further questions? If not you might consider marking an answer by clicking on the tick next to it: meta.stackexchange.com/questions/5234/…
as Darin Dimitrov said it can be used to generate dynamic javascript at runtime or sometimes also used for on the fly minifying of javascript files.
