Download JavaScript & DHTML Cookbook by Danny Goodman PDF

By Danny Goodman

Whereas i do not are looking to flip humans clear of this ebook, i need to indicate that some of the recipes during this e-book (like DOM manipulation, Ajax, styling, etc.) could be performed extra simply utilizing a framework like jQuery. i assume for this reason i used to be just a little upset by means of this e-book; many of the issues it accomplishes will be solved utilizing a number of traces of jQuery.
I gave it 5 out of 5 stars for 2 purposes: to start with, it does offer a few first-class examples, specifically in departments the place jQuery is not all that worthy like string manipulation and arrays. The date manipulation recipes are very invaluable in addition. Secondly, i did not imagine it used to be reasonable to provide it something reduce simply because i do not use all the fabric in it. i am certain that finally i'm going to turn out doing a little form of uncooked DOM manipulation with out jQuery, even if or not it's with Greasemonkey userscripts or on moveable units, or for terribly brief scripts.
In my opinion, this publication is for somebody who's now not utilizing jQuery (either simply because they do not are looking to or cannot) or for somebody who's constructing a JavaScript framework. i might additionally suggest it for somebody who wishes easy-to-use examples of array, string, and date manipulation.

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It is not a suitable approach to validating numeric input to a text box. That’s because the parseInt( ) and parseFloat( ) methods return the first numbers (if any) they encounter in the string value passed as an argument. If someone enters 32G into a text box intended for an age, the parseInt( ) method pulls off the 32 portion, but the full value of the text box is not valid for your database that expects a strictly numeric value for that field. 2 for more robust ways of validating numeric text entries.

It’s a good idea to specify the optional second parameter to parseInt( ) as a 10, signifying that you want the value treated as a base-10 value. If you don’t, and the string begins with a zero and either an 8 or a 9, the string number is treated as an octal value (whose allowable digits are 0 through 7), and the 8 and 9 digits are treated as nonnumeric. 6). As for converting a number to a string, an old trick from the earliest days of JavaScript still works. It’s simply an extrapolation of the behavior just explained that forces the addition operator to give priority to string concatenation over numeric addition.

25) returns -3. floor( ) method as a substitute for what some other languages treat as obtaining the integer part of a number. Anytime a floating-point number evaluates to a number equal to an integer value, the decimal and digits to the right of the decimal go away. A variable can hold a floatingpoint number in one statement and be modified to an integer in the next. This drives some programmers crazy because they were indoctrinated by other languages to treat each type of number as a different data type.

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