Should I load javascript in an IFrame embedded in an ASP.NET page?

Is the best approach to loading javascript files to put them in an IFra开发者_StackOverflow社区me and then embed the same in asp.net pages? I have read somewhere that this will help to boost page-loading times.

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Best is to put script references at the bottom of the page. This ensures that all content is loaded before the scripts. Don't use the iFrame unless needed.

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When looking at page load times, it depends on where your code is stored. If it is in the html then it will be reloaded each time the page is loaded. If you move it out to a js file, it will be loaded the first time and cached after that so then you shouldnt have a problem with affecting the load times.

You can use jQuery's $(document).ready to make sure that all the elements are loaded before running any code.

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Don't go for the iframe approach. Put the scripts as far away at the bottom of your html as possible and your css as high as possible. Also try to go for unobtrusive javascript if possible. jQuery's great at this so you surely want to take a look into this. The benefit of jQuery is that it's also put on CDN servers which also speeds up performance.

I found these guidelines to be a great help when I was upgrading the performance of one of my former projects at a client: Best Practices for Speeding Up Your Web Site.

Some great tools are also Firebug in combination with YSlow.