java barcode scanner api The history object is often used as an easy way to direct the user back to the previous page in Java

Encode Denso QR Bar Code in Java The history object is often used as an easy way to direct the user back to the previous page

The history object is often used as an easy way to direct the user back to the previous page
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<html> <head><tile>User Login Script</title></head> <body> <h1>Error: Unable to Log In</h1> I'm sorry, the password you supplied was incorrect Please use the Back button on your browser to try again, or <a href="javascript:historyback()">click here</a> to
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be automatically sent there </body> </html>
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For security reasons, the history object does not provide JavaScript access to the names or URLs of the web pages you have visited
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Send the Browser to a New Location
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The location object gives JavaScript access to the browser address bar Specifically, programmers can determine the URL of the current page, reload the current page, or send the browser to a new URL The location object has eight properties
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Property Name href hash host hostname pathname port protocol search Purpose Gets or sets the entire URL as a string Gets or sets the portion of the URL after the hash sign (#) Gets or sets the hostname and port number portion of the URL Gets or sets the hostname portion of the URL Gets or sets the filename or path of the web page Gets or sets the port number portion of the URL Gets or sets the web protocol name of the URL (eg, HTTP) Gets or sets the portion of the URL after the question mark ( )
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The location object also has three methods
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Method Name assign reload replace Purpose Loads a new web page Reloads the existing web page Replaces the existing web page by loading a new web page
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The location object is commonly used to redirect the browser to a new web page
locationhref = "http://wwwexamplecom/another/pagehtml";
But it can also be used just to reload the current page, similar to a browser refresh action
locationreload();
In the next chapter, we will examine how to perform some simple animation using JavaScript, CSS, and Dynamic HTML Using a technique known as absolute positioning, we will be able to place text and images anywhere we wish inside a web page
12
Perform Simple Animation
How to Do Everything with JavaScript
How to
Format a web page using style sheets Control text and image positioning Modify styles using JavaScript Perform basic animation using JavaScript
In 11, you saw how the browser DOM can be manipulated using JavaScript to modify the HTML in a web page after it has already been loaded into the browser This technique is often used for allowing JavaScript to respond to user events or input without having to go back to the web server to re-create the page As you ll see in this chapter, Cascading Style Sheets (CSS) allow developers to specify the exact layout and positioning of elements on the web page Style sheets can be dynamically modified in JavaScript as well, allowing elements to be given a different appearance or even moved to a different position on the screen Animation is often nothing more than the repeated manipulation of the DOM and/or style sheets using JavaScript An animated butterfly can appear to flutter across the screen with nothing more than the repeated swapping of a small number of images combined with the slow repositioning of those images across the page In this chapter, we will examine how style sheets can be dynamically modified using JavaScript and how that technique can be used to create some simple animation effects
Learn the Basics of Cascading Style Sheets
We have touched briefly on the topic of style sheets before, but in this section we will examine it in more detail to gain a better understanding of what style sheets can do for web developers and how JavaScript can be used to dynamically affect style The style of a web page is the manner in which the contents of the web page, such as the text and graphics, are formatted and arranged Style encompasses everything from how fonts and colors are used to the sizes and positioning of objects inside the browser window When the Web was first developed in 1991, very little consideration was given to style the emphasis was on content The Web was used for the presentation and linking of related text documents In fact, one of the overriding philosophies of its design was that web clients (generally browsers) should be responsible for rendering the web page in the manner they best saw fit For instance, the <h1> tag simply defined a first level heading, and it was up to the browser to define the exact font type and size used for displaying the heading text The content of <h1> tags could theoretically look completely different depending on the brand of browser you were using or the operating system you were running Of course, many developers needed more precise methods to format the contents of a web page, so some pretty elaborate schemes were sometimes used to provide a complex page layout, such as the use of invisible images to help solve spacing problems
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