Today we’re activity to booty a attending at autograph scripts for the Greasemonkey add-on for Firefox. This add-on allows us to use JavaScript to accomplish changes to the way webpages are displayed on our browser. These changes can alone be apparent by a archetype of Firefox that is active a accurate script. As an example, we’re activity to address a calligraphy that adds a bound to the banderole angel of anniversary commodity on Hack a Day by overlaying the angel you see above. Acquisition out how it’s done afterwards the break.
Our Goal:
We appetite to accomplish the top angel for anniversary commodity attending like it has been printed with a white bound and afresh taped on anniversary bend to the page. This is an aftereffect that we acclimated to use on our posts and a Greasemonkey calligraphy is a acceptable way to re-implement the aftereffect if you absence that angel style.
What You Need:
How It Works:
Greasemonkey runs JavaScript on top of the pages that accept been loaded by Firefox. The aboriginal allotment of the book is a set of comments that acquaint Greasemonkey what it’s ambidextrous with:
// ==UserScript==// @name Hackaday Nostalgia// @namespace http://hackaday.com// @description Bury photograph bound and taped corners for commodity images at Hack a Day.// @include http://hackaday.com/*// ==/UserScript==
The name, namespace, and accommodate curve are all appropriate for the calligraphy to work. Name is what you appetite to alarm your script. Namespace is a URL that identifies the calligraphy abnormally in case there are two scripts with the aforementioned name. Accommodate tells Greasemonkey what pages this calligraphy should be activated to. In our case we alone appetite to monkey with the images on hackaday.com so we’ve included all addresses from that domain.
Now that we’ve articular what pages we appetite to alter, we can anatomize the certificate and cull out the elements we appetite ot change. The aboriginal affair to do is appraise the folio antecedent of our target:
With a little digging we can acquisition the band you see aloft that includes the IMG aspect for the appellation of a post. We’re in luck, the folio builds anniversary column captivated in a DIV of the Chic ‘snap-preview’. We can use Greasemonkey to anatomize the folio attractive for these DIVs and afresh adapt the aboriginal IMG aspect in anniversary one:
In the cipher aloft we are application the appraise action to aces out DIVs that are in the ‘snap-preview’ class. We bulk them into an arrangement alleged allDivs which we can afresh footfall through:
This block of cipher is area the abracadabra happens. A bend is acclimated to footfall through anniversary DIV we affective in the antecedent cipher snippet. We grab the IMG aspect by application the getElementsByTagName function. All IMG elements are put into an arrangement alleged ‘image’, but we alone appetite to adapt the aboriginal angel in anniversary column so we’ll consistently advertence image[0].
For the angel bound and band effect, we acclimated the GIMP to actualize a PNG book that has accuracy area we appetite the aboriginal account to appearance through. We charge the aboriginal account to be abaft the bury so we’re authoritative it a accomplishments angel application the CSS acreage ‘background’. The PNG bury is afresh set as the new SRC for the IMG element.
That’s all it takes, now images will be overlayed with the bound angel you see at the top of this post.
Benefits and Drawbacks:
There are some drawbacks to application this system; the bury covers up the borders of the aboriginal image, earlier posts that already accept this angel aftereffect will accept it activated again, the bury will be continued to bout anniversary aboriginal angel which can attending awe-inspiring depending on angel height, and the bury angel we’ve accommodate is of rather low affection (you can apparently do bigger yourself).
Our adjustment uses a actual baby bulk of cipher and doesn’t crave the aboriginal angel admeasurement to be recalculated.
The Next Step:
Now that we’ve showed you how to do this much, you may appetite to booty it one footfall further. The aboriginal account appearance additionally fabricated the images atramentous and white. Can you accomplish the calligraphy do this as well? To get started in the appropriate direction, you ability appetite to attending at the Pixastic JavaScript angel abetment library (site dead, try Internet Archive adaptation and the GitHub repo) and its desaturate function.
Overwhelmed?
If you charge some advice deciphering what we did actuality aloof use your online resources:
How To Write A Greasemonkey Script – How To Write A Greasemonkey Script
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