- How To Create A PDF From Your Web Application
For your convenience Apress has placed some of the frontmatter material after the index. Please use the Bookmarksand Contents at a Glance links to access them. This startedbecause browsers and the devices they run on have been less capable than enterprise-class servers. Toprovide any kind of serious web app functionality, the server had to do all of the heavy lifting for thebrowsers, which was pretty dumb and simple by comparison.
Over the last few years, browsers have got smarter, more capable, and more consistent in how theyimplement web technology and standards. What used to be a fight to create unique features has becomea battle to create the fastest and most compliant browser. The proliferation of smartphones and tabletshas created a huge market for high-quality web apps, and the gradual adoption of HTML5 provides webapplication developers with a solid foundation for building rich and fluid client-side experiences.
Sadly, while the client-side technology has caught up with the server side, the techniques thatclient-side programmers use still lag behind. The complexity of client-side web apps has reached atipping point where scale, elegance, and maintainability are essential and the days of hacking out aquick solution have passed.
In this book, I level the playing field, showing you how to step up yourclient-side development to embrace the best techniques from the server-side world and combine themwith the latest HTML5 features. About This BookThis is my 15th book about technology, and to mark this, Apress asked me to do something different:share the tools, tricks, and techniques that I use to create complex client-side web apps. The result issomething that is more personal, in for mal, and eclectic than my regular work.
I show you how to takeindustrial-strength development concepts from server-side development and apply them to thebrowser. By using these techniques, you can build web apps that are easier to write, are easier tomaintain, and offer better and richer functionality to your users.
You are targetingan ever-wider range of device, including desktops, tablets, and smartphones, and keeping it all workingis getting tougher.
Your working days are longer, but you have less time to spend on new featuresbecause maintaining the code you already have sucks up a big chuck of your time. The excitement that comes from your work has faded, and you have for gotten what it feels like tohave a really productive day of coding. You know something is wrong, you know that you are losing yourgrip, and you know you need to find a different approach.
If this sounds familiar, then you are my targetreader. This is an advanced book, and you need to be an experienced web programmer to understand thecontent.
I have written a couple of other books you might find useful as primers for this one. This explains everything you need to create regularweb content and basic web apps.
I make a lot of use of jQuery in this book. I provide all of the in for mationyou need for each topic, but if you want a better grounding in how jQuery works and how it relates to theDOM API, then read Pro jQuery.
Both of these books are published by Apress. The specifications are authoritative but can be hard-going and arenot always that clear. Some chapters are builtpurely on HTML5 APIs such as Chapters 5 and 6, which show you how to create web apps that workoffline and how to store data in the browser , but the other chapters are not tied to any particular versionof HTML. What Is the Structure of This Book? In Chapter 2, I build a simple web app for a fictitious cheese retailer called CheeseLux, building on thebasic example I introduce later in this chapter.
I follow some pretty standard approaches for creatingthis web app and spend the rest of the book showing you how to apply industrial-strength techniques toimprove different aspects. I have tried to keep each chapter reasonably separate, but this is a reasonablyin for mal book, and I do introduce some concepts gradually over a number of chapters. Each chapterbuilds on the techniques introduced in the chapters that go be for e it.
You should read the book inchapter order if you can. The following sections summarize the chapters in this book. I also list the software you will need if you want to re-create the examples onyour own or experiment with the listings that are included in the source code download thataccompanies this book and which is available free from Apress.
I use this as an opportunity to introduce some of thetools and concepts that you will need for the rest of the book and to provide a context so that I can showbetter techniques in later chapters. Chapter 3: Adding a View ModelThe first advanced technique I describe is introducing a client-side view model into a web app. If you adopt only one technique from this book, then make it this one; it will have thebiggest impact on your development practices.
You may not haverealized that you have a navigation problem, but when you see how URL routing can work on the clientside, you will see just how powerful and flexible a technique it can be. This is a powerful technique that is increasingly important assmartphones and tablets gain market penetration. The idea of an always-on network connection ischanging, and being able to accommodate offline working is essential for many web apps.
Chapter 7: Creating Responsive Web Apps There are entire categories of web-enabled devices that fall outside of the traditional desktop and mobiletaxonomy. One approach to dealing with the proliferation of different device types is to create web appsthat adapt dynamically to the capabilities of the device they are being used on, tailoring theirappearance, functionality, and interaction models as required. In this chapter, I show you how to detectthe capabilities you care about and respond to them.
I show you some convention-based approaches and introduce theAsynchronous Module Definition, which solves some complex problems when external libraries havedependencies on other functionality.
I also show you how you can easily apply unit testing to yourclient-side code, including how to unit test complex HTML trans for mations. Do You Describe Design Patterns? If you are reading this book,then you want to see those results and get the benefits they provide now. My advice is to solve yourimmediate problems and then start researching the theory.
A lot of good in for mation is available aboutdesign patterns and the associated theory. Wikipedia is a good place to start. Some readers may besurprised at the idea of Wikipedia as a source of programming in for mation, but it offers a wealth of wellbalancedand well-written content. I love design patterns. I think they are important and useful and a valuable mechanism for communicating general solutions to complex problems. Sadly, they are all too often used as a kind ofreligion, where every aspect of a pattern must be applied exactly as specified and long and nastyconflicts break out about the merits and applicability of competing patterns.
My advice is to consider design patterns as the foundation for developing techniques. Mix andmatch different design patterns to suit your projects and cherry-pick the bits that solve the problems youface.
The day you start arguing about solutions to theoreticalproblems is the day you go over to the dark side. Be strong. Stay focused. Resist the pattern zealots. The layout of the example web apps is pretty simple. There are acouple of reasons for this. The first is that this is a book about programming, and while I spend a lot oftime showing you techniques for managing markup dynamically, the actual visual effect is very much aside effect.
The second reason is that I have the artistic abilities of a lemon. In fact, as a child I wasexcused from art lessons because of a total and absolute lack of talent. I am a pretty good programmer,but my design skills suck. In this book, I stick to what I know, which is heavy-duty programming. Then you adapt the techniques until you do like them and find alternative tools that work the way youprefer.
The critical in for mation in this book is that you can apply heavy-duty server-side techniques tocreate better web apps. My preferred tools andtechniques work well for me, and if you think about code in the way I do, they will work well for you too. Books have a page budget, which is set rightat the start of the project.
The page budget affects the schedule for the book, the production cost, andthe final price that the book sells for. Sticking to the page budget is a big deal, and my editor getsuncom for table whenever he thinks I am going to run long hi, Ben! I had to do some editing to fit in allof the code I wanted to include. Listing YesNoThis listing is based on one from Chapter 8.
The full listing gives you a wider context about how thetechnique at hand fits into the web app world. A Code Fragment These fragments are cumulatively applied to the last full listing so that the fragment in Listing shows a meta element being added to the head section of Listing Instead, you can download a completeset of every code listing in this book from Apress.
This free download also includes the server-sidecode that I refer to later in this chapter and use throughout this book to create different aspects of theweb app. You will need a few pieces of software if you want to re-create the examples in this book. There are lots ofchoices for each type, and the ones that I use are all available without charge. I describe each in thesections that follow along with my preferred tool in each category. Getting the Source CodeYou will need to download the source code that accompanies this book, which is available withoutcharge from Apress.
The source code download contains all of the listings organized by chapter andall of the supporting resources, such as images and style sheets. You will need the contents of thisdownload if you want to completely re-create any of the examples. I use Komodo Edit from Active State. I have no affiliation with Active State other thanas a happy user. Getting a Desktop Web BrowserAny modern mainstream desktop browser will run the examples in this book.
How To Create A PDF From Your Web Application
Rachel Andrew is a web developer, writer and speaker. Many web applications have the requirement of giving the user the ability to download something in PDF format. In the case of applications such as e-commerce stores , those PDFs have to be created using dynamic data, and be available immediately to the user. If you have a favorite tool or any experiences of your own to share, please add them to the comments below. In the case of an invoice, the user might be able to view the information online, then click to download a PDF for their records.
If you want to use the DOM File API from extensions or other browser chrome code, you can; however, note there are some additional features to be aware of. The multiple attribute on the input element allows the user to select multiple files. It is also possible but not mandatory to access the FileList through the change event. You need to use EventTarget. You can determine how many files the user selected by checking the value of the file list's length attribute:.
The wide range of functions exceed most converter tools and bring your PDF converting to the next level. Supports all HTML5 elements. Use cutting-edge CSS3 like calc, media queries, box-shadow, text-shadow, filter.
Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email.
Printing with CSS. Typeset quality PDF. Web Standard Compliant.
For your convenience Apress has placed some of the frontmatter material after the index. Please use the Bookmarksand Contents at a Glance links to access them. This startedbecause browsers and the devices they run on have been less capable than enterprise-class servers. Toprovide any kind of serious web app functionality, the server had to do all of the heavy lifting for thebrowsers, which was pretty dumb and simple by comparison. Over the last few years, browsers have got smarter, more capable, and more consistent in how theyimplement web technology and standards. What used to be a fight to create unique features has becomea battle to create the fastest and most compliant browser. The proliferation of smartphones and tabletshas created a huge market for high-quality web apps, and the gradual adoption of HTML5 provides webapplication developers with a solid foundation for building rich and fluid client-side experiences.
Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Skip to content.
Sponsored by Frontend Masters , advancing your skills with in-depth, modern front-end engineering courses. Download: PDF epub. This is a guide that everyone can use to learn about the practice of front-end development. It broadly outlines and discusses the practice of front-end engineering: how to learn it and what tools are used when practicing it in
В отчет вкралась какая-то ошибка? - Мидж промолчала. Джабба почувствовал, что она медлит с ответом, и снова нахмурился. - Ты так не считаешь.
Черный ход представлял собой несколько строк хитроумной программы, которые вставил в алгоритм коммандер Стратмор. Они были вмонтированы так хитро, что никто, кроме Грега Хейла, их не заметил, и практически означали, что любой код, созданный с помощью Попрыгунчика, может быть взломан секретным паролем, известным только АНБ. Стратмору едва не удалось сделать предлагаемый стандарт шифрования величайшим достижением АНБ: если бы он был принят, у агентства появился бы ключ для взлома любого шифра в Америке.
Она, разумеется, знала, что были и другие программы, над которыми он работал так долго, программы, создать которые было куда легче, чем нераскрываемый алгоритм. Вирусы. Холод пронзил все ее тело. Но как мог вирус проникнуть в ТРАНСТЕКСТ. Ответ, уже из могилы, дал Чатрукьян.
Espera! - крикнул он ему вдогонку.