autodesk autocad mep 2017
Autodesk Inventor Professional 2017
Typically the bookmarklet code is put into the href attribute of an HTML anchor element like most links on the web and this can then simply be dragged to a bookmark bar or added to favourites via the anchor link. Bookmark functionality in browsers essentially just treats the saved text as a location when a given bookmark is selected, and so bookmarklets are executed via the URL destination of a web browser the code being run against whatever document is currently loaded.
Most bookmarklets are, however, more useful than this – typically they obtain information from or modify the current page in some way that is useful to the user. So let’s get going Just before we actually start diving in to making a proper bookmarklet, it’s probably worth us talking a little bit about browser support.
If you haven’t heard about this, an anonymous function is simply a function which isn’t bound to a name, and so for this purpose you can simply nest a function without a name or any parameters in some brackets and then use to call the function – for example: The plan for this one is that we redirect the current page to the validator website, and tell the validator about the previous URL to get it to validate it.
The W3 validator gets the URL to validate through the uri parameter in the URL, and hence something like the following should be able to accomplish our goals: Also note that in the above that nesting in an anonymous function is not really necessary, however in my eyes it is still good practice and provides a foundation for future expansion if required.
Another nice example bookmarklet might be one which changes the font on a page. Ideally we want our CSS property to have the! We could make use of the “style” attribute in HTML, however changing this attribute to whatever we want may break the current page as the “style” attribute may be in use by the page, we could insert a “style” block, which seems very effective however for this basic example seems a bit OTT, or we could do what we’re going to do, which is use the style.
This method, when performed upon an element, changes a CSS property the first parameter to a specified value the second parameter – in many browsers a third property is also supported which allows you to set the priority of the rule i.
The only real catch here is that the third parameter isn’t supported in IE, but oh well, we don’t really care about IE all that much for this example, let’s just roll with it. Our approach certainly isn’t going to work in all environments or on all websites, but it’s a basic example and it should work fine in the majority of use-cases.
It’s not uncommon for bookmarklets to simply be “stubs” which just add a script element to the DOM which brings in an external script, from GitHub for example. Usually this is done by creating a script element on the page, setting its type and src attributes, and then bringing this child element into to the head – so something like the following line-breaks added here for clarity: When using external files like this, it’s also important to think about caching.
It’s likely that the file will get cached by the user’s browser and so if you don’t want this functionality What if you’ve updated the script since the user’s last usage but their browser is using the cached version?! A great example of a “real” bookmarklet being a stub for an external file and using a URL parameter to prevent caching is the fitWeird bookmarklet by Paravel – at the time of writing the bookmarklet code is simply the following stub which brings in a JS file from GitHub and uses Math.
I don’t want to talk about this too much as all the checking is a little code-heavy, but it’s not all that difficult once you figure out what you’re doing and have your dependency checks and such set up — there’s a good article over at Smashing Magazine which guides you through making a basic bookmarklet using jQuery which may interest you if you commonly use libraries and think it could be useful for this kind of thing.