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code will not work unless you have placed a semicolon after every single statement If you will be using any of these you ll save a lot of time by getting into the habit of using semicolons right away
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If this is all new to you, you should now have a very basic picture of how JavaScript, CSS, and the DOM relate to each other This will help you understand the plug-in documentation in the following chapters In them, I provide all the information you need to effectively use the plug-ins on your own pages, as well as how to modify and improve them for your own purposes
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3
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the Core plug-ins
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plug-In JavaScript: 100 power Solutions
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n my previous book, Plug-in PHP (McGraw-Hill/Professional, 2010) I was able to draw upon the wealth of ready-made functions supplied with the language However, this hasn t turned out to be the case with JavaScript, so this chapter concentrates on providing a selection of basic functions needed in order to be able to develop JavaScript programs as quickly and efficiently as possible This chapter contains more plug-ins than any other chapter (18 in all), as well as a collection of handy global variables that will make your life much simpler, and will make the remaining plug-ins easier to understand and modify Since these core plug-ins and global variables are used throughout the book I recommend you take the time to digest the contents of this chapter as fully as possible before starting to use the remaining functions I apologize in advance for the amount of documentation on these first few plug-ins, but they are important ones, and it s essential that you are fully familiar with their use
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The O() function is the most fundamental of the plug-ins provided in this book and is used by almost all the others In its simplest form it replaces the long-winded JavaScript function name getElementById(), which takes the string argument supplied to it and then returns the HTML DOM (Document Object Model) object that has been assigned that ID The letter O is short for the word Object since the main purpose of this function is to retrieve an object or to modify its properties
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About the Plug-in
This plug-in takes one required and two optional arguments as follows: id This can be a string containing the ID of an object, an object, or even an array containing several objects and/or object IDs If none of the optional arguments are also provided then the function returns the object or objects represented by id If there are optional arguments then the purpose of the function changes to assign the value in value to the property in property of the object (or objects) in id property This optional string argument can contain the name of a property belonging to the object (or objects) in id that requires modifying value If this optional argument is set it represents the value to be assigned to the property in property of the object (or objects) in id Both the property and value arguments must have values, otherwise O() will simply return the object (or objects) in id
Variables, Arrays, and Functions
tmp[] j UNDEF InsVars() Array holding the result of processing the id array Integer loop variable for indexing into id Global string variable with the value undefined Plug-in to insert values into a string
3:
the Core plug-ins
push() substr() eval() try() catch() getElementById
Function to push a value onto an array Function to return a substring from a string Function to evaluate a string as JavaScript code Function to run a function passing an any error to a matching catch() statement Function called when a try() statement fails Function to return an object by its name
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