Download Borland Delphi how-to : the definitive Delphi problem solvr by Gary Frerking; Nathan Wallace; Wayne Niddery PDF

By Gary Frerking; Nathan Wallace; Wayne Niddery

The definitive Delphi challenge solver, Borland Delphi How-To is helping Delphi programmers, either starting and complicated, triumph over universal demanding situations, remedy advanced difficulties, and notice their programming visions. The CD comprises the entire instance how-to ideas, assets, bitmaps, and functions built within the booklet

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The example on server-side validation in the last section touched on user expectations when working with the user registration form. Users don’t expect communication with the server in any form unless one of the following is true: • The user initiates the action—This comes in the form of clicking a mouse button, hitting the Enter or Return key, ending a drag-and-drop action, or performing some other definitive event to indicate an expected response from the server. • The action taken does not take the user out of context and happens in seamless integration with the current interface—Auto-saving drafts falls into this category, along with streaming requests such as an RSS ticker.

The use of the thead, tbody, and tfoot tags, each with their corresponding tr collections of th tags or td tags (in the case of tbody), gives a semantic foothold for scripting and styles. The caption tag, which appears just after the opening table tag, gives exactly what it describes; allowing the titling of a table without losing the semantic coherence of an external, adjacent div. Thus, the caption tag gives context to the table headings about to get read out to the user. By adding a summary attribute to the table when appropriate, users with screen readers will have an even better idea of what the table has organized before they get lost in the sea of table cells.

Mozilla has much better DOM support, but the margins don’t quite match. Opera has almost everything correct, though it still lacks control over the character spacing and dimensions. Safari has support for current drafts of a few CSS3 properties and much more precise control over character spacing, kerning, and margins. 13 An increasing amount of accurate support. 13 shows an increasing amount of accurate support. ) Coding CSS and JavaScript unobtrusively not only makes it easier for the interface to degrade gracefully, but also it encourages clearer lines between interface structure, design, and behavior.

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