The try-catch Statement

JavaScript provides a try-catch statement that is capable of intercepting thrown errors
before they are handled by the browser. The code that might cause an error comes in
the try block and code that handles the error goes into the catch block. For instance:

try {
somethingThatMightCauseAnError();
} catch (ex) {
handleError(ex);
}



When an error occurs in the try block, execution immediately stops and jumps to the
catch block, where the error object is provided. You can inspect this object to determine
the best course of action to recover from the error.
There is also a finally clause that can be added. The finally clause contains code that
will be executed regardless of whether an error occurs. For example:

try {
somethingThatMightCauseAnError();
} catch (ex) {
handleError(ex);
} finally {
continueDoingOtherStuff();
}
Related Posts:
  • Javascript search search(regexp)The search() method is the same as indexOf() except that it takes aregular expression pattern instead of a substring. It also returns -1 if thepattern isn’t found."hello world".search(/[aeiou]/); // Find the fi… Read More
  • JavaScript Redirect <script type="text/javascript"> window.location = "http://www.yoursite.com/" </script> … Read More
  • Javascript The + Operator The binary + operator adds numeric operands or concatenates string operands: 1 + 2 // => 3"hello" + " " + "there" // => "hello there""1" + "2" // => "12" When the values of both operands are numbers, or are both str… Read More
  • Creating A Function In Javascript The basic structure of a function looks like this: function functionName() {// the JavaScript you want to run} The keyword function lets the JavaScript interpreter know you’re creating a function—it’s similar to how you use … Read More
  • Javascript Image Objects Properties of Image Objects Property Description align Indicates the alignment of the image, usually “left” or “right.” alt The alternative text rendering for the image as set by the alt attribu… Read More
  • Javascript Objects as Arguments You may want to write functions that take many arguments, some ofwhich are optional.function drawElement( color, border, width, height,left, top, zIndex) {// Make and display an element with these variables}drawElement("red"… Read More
  • Javascript String Constructor String is the built-in object corresponding to the primitive string data type. It contains a very large number of methods for string manipulation and examination, substring extraction, and even conversion of strings to marke… Read More
  • JavaScript String Split Function split()The split() method splits (for lack of a better word) a string up into substrings and returns them in an array. It accepts a string or regular expression argument containing the delimiter at which the string will be b… Read More
  • JavaScript Popups <head><script type="text/javascript">function testPopup() {window.open( "http://www.google.com/" )}</script></head><body><form><input type="button" onClick="testPopup()" value="Click"&g… Read More
  • JavaScript and XML To demonstrate JavaScript, XML, and the DOM in action, let’s use Internet Explorer 5.5 or better to load an XML document containing our employee directory and see if we can manipulate it. First, to load in the document w… Read More
  • JavaScript Alert The JavaScript alert is a dialogue box that pops up and takes the focus away from the current window and forces the web browser to read the message. 1. <form> <input type="button" onclick= "alert('Are you sure you… Read More
  • JavaScript Variables Variables store a value you can refer to later in the script. Variable namescan be nearly any valid identifi er. A JavaScript identifi er is a word thatcontains only letters, numbers, $, and _, and that doesn’t start with an… Read More
  • Javascript Making a simple MouseOver <a href="http://www.cit.cornell.edu"onMouseOver="document.logo.src='family.gif ' ; "onMouseOut ="document.logo.src='harry.gif ' ; " ><img name="logo" src="harry.gif " border=0></a> The onMouseOver and onM… Read More
  • JavaScript System Dialogs alert(),confirm(),prompt() The browser is capable of invoking system dialogs to display to the user through the alert(),confirm(), and prompt() methods. These dialogs are not related to the web page being displayedin the browser and do not contain HTM… Read More
  • Javascript Recursion Recursion is when a function calls itself. This is often useful in mathematics,such as fi nding the nth number in the Fibonacci series (1, 2, 3, 5,8, 13, 21…).function fi bonacci(n) {if ( n < 2 ) {return 1;} else {return … Read More