From the category archives:

Utveckling

Medlemsregistrering och OpenID

by Patrik Högberg on 12 mars 2009

Puh, nu är jag äntligen klar med att göra om hela OpenID implementeringen med medlemsregistrering och inloggning på www.hemochharmoni.se. Nu ska det vara betydligt enklare och framförallt fungera mycket bättre än när vi lanserade betaversionen i slutet av förra veckan.

Såhär har vi kombinerat OpenID med medlemskap på sajten:

Ny medlem utan ett OpenID
1. Registrerar OpenID på vår egen server
  - Samtidigt så automatgodkänner vi vår egen sajt så man slipper ge ”trust” som annars OpenID kräver
  - Profildata godkänns att skickas över till sin egna sajt när det efterfrågas (vi södjer SREG 1.1 för OpenID 2.0)
2. Användaren loggar in på Hem & Harmoni med sitt OpenID
  - Vårt system kontakar vår OpenID server och validerar kontot
  - All registrerad profildata från OpenID skickas över till inloggaren i bakgrunden
  - En ny medlem skapas i Hem & Harmoni med den inhämtade profilen
Ny medlem som redan har ett OpenID (på Wordpress, Blogger etc)
1. Loggar in på Hem & Harmoni direkt
  - Vår klient skickar förfrågan till Wordpress, Blogger etc, också samtidigt eventuell profildata
  - Om nödvändigt skickar vår server användaren till WordPress, Blogger etc för att logga in där
  - En ny medlem skapas i Hem & Harmoni med den inhämtade profilen
Redan medlem
1. Loggar in med sitt vanliga OpenID
  - Vår klient kontaktar OpenID servern och hämtar uppdaterad profildata
  - Om nödvändigt skickar vår server användaren till OpenID servern för att logga in där

Sådär ser processen ut ganska enkelt. Vad vi gjort är att när man har ett OpenID hos oss så sker all kommunikation kring inloggningen internt med Ajax i ett iframe fönster. Så att ha ett OpenID på vår sajt gör inloggningen lite enklare och snabbare faktiskt, men det utesluter inte att använda sitt OpenID som man har på något annat ställe.

Mina erfarenheter av OpenID är just nu väldigt kritiska, jag har fått lägga ner 3 veckors normal arbetstid för att få ordning på bara inloggningsbiten och det känns inte rimligt. Anledningen till att det varit så krångligt att få till är att våra sajter använder Web 2.0 i stor utsträckning och just protokollet för OpenID har väldigt lite stöd för det.

Egentligen är det bara ett problem eftersom vi valt att ha både server och klient tjänst, dvs man kan även registrera ett OpenID hos oss och använda Hem & Harmoni’s konto för att logga in på Blogger, Yahoo, Wordpress och en massa andra sajter och det som sagt krävde en del av oss.

Eftersom vi kommer lansera flera sajter inom Byggmedia ska jag naturligtvis återanvända denna tekniska implementering, så det kanske lönar sig långsiktigt att vi lagt så mycket resurser på bara den här grejen. Men nu kan jag i princip allt om OpenID i alla fall.

{ 2 comments }

CSS och PNG filer ger olika färger trots att båda använder sRGB

by Patrik Högberg on 22 januari 2009

Vill här dela med mig om ett litet tips för de som har problem att lägga en PNG fil ovanför en definerad bakgrundsfärg i CSS och inte får färgerna att stämma i olika webbläsare. När man sparar webbfiler i Photoshop ska man se till att man jobbar i sRGB som är en standard på skärmar. Men det blir ändå ett litet problem med PNG-filer om man jobbar i Photoshop CS som har väldigt dåligt stöd för just PNG.

En test för att exemplifiera problemet
Jag har här gjort en liten PNG bild i Photoshop (Working space sRGB) på 100×100 pixels med RGB värdet #E5E5E5 och lagt den på en webbsida som har en bagrundsfärg definerad i CSS som #E5E5E5 så blir det såhär i alla webbläsare utom Safari på Mac och iPhone.

HTML koden:
<div style="background-color:#E5E5E5; border:gray solid 1px; padding:50px;"> <img src="/images/backgrounds/test_100x100.png"> </div>

Om man har en någorlunda bra skärm så ser man bilden på 100×100 pixels jag skapade i Photoshop i mitten av ovan skärmdump från Firefox på Mac av en DIV på 200×200 pixels med samma bakgrundsfärg. Testar man detta i olika webbläsare syns boxen olika mycket på olika OS och olika webbläsare. Dock är det endast Safari på Mac som visar exakt samma bakgrundsfärg på bilden och boxen och boxen syns således inte där.

Vem bryr sig
Man kan undra varför bry sig om detta lilla problem, man kan ju spara filer i JPG eller GIF istället och strunta i PNG, eller man kan fylla en DIV med PNG filen som bakgrund och slippa dessa problem. Men det är nämligen så att PNG-filer visar betydligt bättre bilder, till skillnad mot JPG som i komprimeringen förstör bilden så återges PNG alltid exakt som originalet oavsett hur mycket man komprimerar filstorleken. Men det är inte det enda, PNG har en fantastik grej och det är gradvis transparens (alfa kanalen). Med den funktionen så kan man skapa fantastiska webbsidor, t.ex. skuggor som går över andra bilder eller låta en bild lysa igenom en aning av en PNG bild ovanpå. Därför bryr vi oss om dessa problem.

Lösningen
PNG filer innehåller en massa meta-information (inställningar av olika saker) och bland dessa har den en omdiskuterad funktion för att kontrollera Gamma (ljusheten i bilden). Tyvärr är det så illa att olika webbläsare tolkar denna Gamma-inställning olika och därför blir ljusheten i PNG bilder olika och därför kan man aldrig lita på att färger från andra filer eller stilmallar matchar PNG filen oavsett hur mycket man än försöker fixa med färginställningen i Photoshop. Lösningen är faktisk ganska enkel, man tar helt enkelt bort Gamma informationen ur PNG filen, då kommer automatiskt alla webbläsare använda samma färginställning (gamma värde) som CSS och andra filer har och därmed matcha de.

Eftersom Photoshops egna funktion i ”Spara för webben” inte har stöd för att ta bort detta i PNG filer så måste man efterbearbeta filen. Jag använder ett program på min Mac som heter pngout (originalet är för PC, men det finns att ladda ner för Mac här), i det programmet kan man ställa in så att den tar bort gAMA (som är gamma meta-informationen i PNG filen) men den komprimerar även PNG filerna med ytterligare 20-60% som produceras av Photoshop. Jag har även fixat ett litet skript på min Mac som gör att jag kan släppa en hel katalog med bildfiler på pngout.app och så fixar den till alla PNG-filer automatiskt som man har i hela webbkatalogen.

{ 3 comments }

Varför bry sig om skärmupplösning, webbläsare och OS

januari 13, 2009

Det är ofta man behöver lite källor om vilka marknadsandelar vissa tekniska begränsningar man har att förhålla sig till. Egentligen är det bara tre viktiga saker att främst anpassa en webbsajt för:

Skärmupplösning – vanligast idag är 1024×768
Webbläsare – vanligast är idag IE6
OS – vanligaste är idag Windows XP

Gällande teknisk statistik hämtar man enkelt från t.ex. [...]

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Read the full article �

Utvecklingsverktyg Netbeans

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I min dagliga jakt på information och lösningar på nätet hittade jag ett nytt IDE (Integrated Development Systen) som fungerar fint med platformen PHP, Apache och MySQL, det heter NetBeans och är från Sun.
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Zend Framework – nödvändiga PHP klasser i nya projekt

december 5, 2008

Nu är jag väldigt teknisk i detta inlägg så detta är riktat till andra programmerare. Här är min lista på väldigt användbara klasser som man behöver i nya projekt med PHP 5 och speciellt när man jobbar med Zend Framework (man kan använda dessa klasser utanför Zend Framework också):

Zend_Registry perfekt ersättare till PHP 4:ans GLOBALS. [...]

Det går segt framåt med våra nya sajter

december 4, 2008

Jag skulle försöka släppa några testversioner av sajterna i december och jag måste faktiskt erkänna att jag ligger lite efter, men jag är på god väg. Som det ser ut nu så blir det inte någon testversion för allmänheten före Lucia, men strax därefter är det troligt.
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Gör PHP-sajten mer effektiv

december 2, 2008

Det har blivit mycket inlägg om utveckling på sistone därför att jag själv just nu jobbar med att utveckla våra sajter, men det kommer snart lite inlägg om användarvänliga gränssnitt, marknad och ”business as usual”. Idag tänkte jag berätta om lite verktyg jag använder för att analysera sidorna man skapar, fixa problem och se till [...]

Problem med navigering när man använder AJAX

december 1, 2008

Att implementera AJAX och Web 2.0 funktioner i webbplatser har blivit självklart när man skapar nya eller fräschar upp gamla sajter. En vanlig webbplats har interna länkar som laddar om hela webbläsarfönstret och det är inte ovanligt att det tar några sekunder och att det flimrar till när hela sidan ska ritas om i fönstret. [...]

Web 3.0, semantisk sajt med hypermodern navigering

november 19, 2008

Jag hävdar att vi är bland de första i Sverige som skapar omfattande Web 3.0 sajter. Begreppet Web 3.0 är inte officiellt definierat ännu, men jag tar mig friheten att påstå att vi nu kommer lansera sådana sajter inom några veckor.
Det är nämligen så att Web 2.0 som tog fart under 2007, mest handlar om [...]

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november 18, 2008

Tänkte berätta lite om varför det är viktigt att betatesta en webbsajt eller funktion i sajten innan man slår på stora trumman och marknadsför den överallt.
I utvecklingsvärlden brukar man kalla förstadiet till en ny produkt alfa och beta versioner och där alfa oftast är en intern testrunda där man ganska kort därefter släpper en betaversion [...]

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Problem med navigering när man använder AJAX

Web 3.0, semantisk sajt med hypermodern navigering

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