asp.net core barcode scanner

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That s all good for browsers that support HTML5, but for your client s band site, you must be a little more flexible and include some JavaScript form validation as well. Adding JavaScript form validation sounds straightforward, and it usually is. But if JavaScript form validation is implemented badly, it can cause more harm than good. If the code has been written sloppily, the user may end up never being able to submit the form. There are three things to remember when you are writing JavaScript form-validation functions: Bad form validation can be worse than no validation at all. Never rely solely on JavaScript. It s not a substitute for server-side validation. Just because you validate a form with JavaScript doesn t mean you shouldn t check the values again when they are sent to the server. Client-side validation is about helping users properly fill out the form and not waste their time with an incomplete submission. Server-side validation is about protecting the database and underlying systems.

The VideoControl offers the following useful options for positioning your playback window: getDisplayWidth and getDisplayHeight return the current dimensions of space occupied by the video playback window, in pixels. getSourceWidth and getSourceHeight return the dimensions of the actual video file, in pixels. getDisplayX and getDisplayY return the coordinates of the upper-left corner of the playing video, relative to the containing GUI object. setDisplayLocation allows you to position the video if the display mode is USE_DIRECT_VIDEO. setVisible controls whether the video is displayed. setDisplaySize will adjust the size of the video image. This may scale the video to fit the requested dimensions, or may just clip the video. You ll need to experiment with your particular videos and devices to determine which happens. setDisplayFullScreen attempts to make the video fill the entire screen.

Summary

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While audio and video may impress users more, images are the foundation of most apps. Images range from simple bitmaps to animated GIF and SVG files. While you re probably familiar with the simplest ways to display images, more advanced techniques may prove useful in certain cases.

It s best to keep form validation as simple as possible To begin, you can just check whether the user has provided any value at all The following function, isFilled, takes an element from a form as its single argument function isFilled(field) { if (fieldvaluereplace(' ','')length == 0) return false; var placeholder = fieldplaceholder || fieldgetAttribute('placeholder'); return (fieldvalue != placeholder); } By checking the length of the value property after removing the spaces, you can see if the value has more than zero characters (and it's not all spaces) If it does not contain characters, the function returns a value of false Otherwise, it continues on to the next comparison By comparing the value property to the placeholder property, you can find out if the user has simply left the placeholder text in the field.

Odds are the first or second BlackBerry program you wrote when first learning the platform included an image. The Bitmap class is the foundation of image creation and drawing. Note that bitmap refers to any rastered image format, including JPEG and PNG in addition to BMP files. You have a wide variety of options available for creating images. Reference a resource in the COD file: Bitmap.getBitmapResource("clip.png"); Create a blank image that you can later draw into: new Bitmap(300, 300); Obtain a built-in system bitmap: Bitmap.getBitmapResource(Bitmap.HOURGLASS); Create from raw image data: Bitmap.createBitmapFromBytes(rawData, 0, -1, 1) or Bitmap.createBitmapFromPNG(rawData, 0, -1); After you have a Bitmap object, you can adjust the raw pixels if necessary by calling getARGB() and setARGB(). In most cases, though, you can then proceed to display the image by creating a BitmapField and then adding it to the screen as you would any other Field.

The Android Market is still very young, but it is already seeing tremendous growth. As I am writing this, there are over 76,000 apps available according to Androlib.com, a web site for browsing Android apps. By the time this book hits publication, there will likely be well over 100,000 apps. That s still not as many as there are available for the iPhone, but considering there were only 50,000 apps available a month ago, it s likely Android will soon surpass Apple in app availability. Because Android has an open market system that doesn t charge developers an annual fee or require a lengthy approval process, there s room for app developers to fill niche markets and create highly specialized apps. That s good news for professionals. Keep an eye on the Android Market for new apps.

screen.add(new BitmapField(bitmap));

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