c# generate data matrix code 7: Developing with HTML5 in Visual C#

Make Data Matrix in Visual C# 7: Developing with HTML5

CHAPTER 7: Developing with HTML5
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lets you move web elements by applying any of three types of transforms: translation, scaling, or rotation. Translation means to move the element in the Cartesian plane. Scaling means to enlarge or shrink the element. And rotation means to rotate the element about an axis. When rotated about the z axis, the rotation happens on the view surface as you would expect in a 2D drawing. But you can also rotate about the X and Y axis. For example, a rotation about the X axis is like tipping the element away from you. You can also combine transformations. Let s take the box we were using above and transform it in all three ways. We make it grow, move, and rotate at the same time. You do this by adding this line to the .box:active declaration block:
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-webkit-transform: scale(2) translate(100px, 0) rotate(30deg);
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Now when you click on the box it enlarges, spins, and moves to the right. The end result is a box that looks like Figure 7 7.
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Figure 7 7. Add some transformations
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Again, we have only scratched the surface on the topic of transitions and transformations. For further information, you can look at the W3C documentation here: www.w3.org/TR/css3-2d-transforms www.w3.org/TR/css3-3d-transforms www.w3.org/TR/css3-transitions
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Local Storage
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Earlier in this chapter we discussed using the application cache to enable offline HTML5 applications. There is one thing missing to make truly robust offline applications local data storage. HTML5 gives you two methods to store data on your client: web storage and web database.
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CHAPTER 7: Developing with HTML5
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Web storage allows you to store values in key-value pairs. This is similar to the current cookie mechanism, but unlike cookies the key-value pair is not sent to the server with every request. Web database is a JavaScript front end to a local SQL database. This provides a robust method for your HTML5 application to access a local relational database even when offline. Local storage is disabled by default in QtWebKit. To enable it, you must set the parameter QWebSettings::LocalStorageEnabled to true. You do this in the same way that we set QWebSettings::OfflineWebApplicationCacheEnabled to true for application cache above.
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Web Storage
Let s talk first about web storage. There are two types of web storage supported: localStorage and sessionStorage. localStorage is meant to be more for storing longterm data. The data persists in local client storage even after the host browser window is closed. Also, the key-value pairs are accessible from any browser window. sessionStorage is meant to be more of a temporary data store for a single browser window. The data can be accessed only from the window in which it was created and the data does not persist after the window is closed. You store a key-value pair like this:
sessionStorage.setItem("item_price", theItemPrice);
and you retrieve the value based on querying the key like this:
var theItemPrice = sessionStorage.getItem("itemPrice"); // now do something with the value document.getElementById( item_price ).value = theItemPrice;
Note that these examples use sessionStorage, but the same functions can be used for localStorage. The syntax to use sessionStorage and localStorage is identical. The only difference are the rules for data persistence that we mentioned above. Also, you can use sessionStorage.length to determine how many keys are stored in your local data store like this: numKeys = session.storage.length; Additionally, you can access a key based on a numeric index like this:
value = sessionStorage(index);
Finally, you can delete a single value like this:
sessionStorage.removeItem("item_price");
and delete all key-value pairs in your domain like this:
sessionStorage.clear();
CHAPTER 7: Developing with HTML5
Web Database
Web database provides a front end for a local SQL database. SQL, Structured Query Language, is an extremely popular standard to access relational databases. SQL itself is a large topic and is beyond the scope of this book. A good source of information for further investigation of SQL is the SQLite website at www.sqlite.org. Let s explore some of the basics of using web database. First you need to create your web database. You do that with a call that looks something like this:
var db = openDatabase(shortName, version, displayName, maxSize);
Once your database is created, you do most of your work with the executeSql function. executeSql is part of a transaction object and is just a thin layer to pass SQL queries to your database. Using executeSql you do things like create tables, insert rows, and make queries. An example SQL query might look like this:
transaction.executeSql("SELECT * from items where color= ;", [myColor], dataHandler, errorHandler);
In this statement, the first argument is the SQL query passed to the local database to be executed. The second argument is an array of JavaScript values that can be used in the query. The third argument, dataHandler, is a callback function to handle the response. Finally, the last argument, errorHandler, is a callback for an error handling function. In this chapter we presented only some of the more popular features of HTML5, which contains lots of cool features beyond the highlights we presented here. Furthermore, HTML5 is a dynamic standard. New features are constantly invented, with implementation following at an amazingly fast pace. For a current snapshot of the latest features supported in QtWebKit please look at the latest supported standards page at: http://trac.webkit.org/wiki/QtWebKitSupportedStandards.
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