Learning JavaScript tutorial – First Look at Client-Side JavaScript

As we seen in our first article "Learning JavaScript – an introduction with JavaScript", JavaScript is mostly used as a client-side scripting language. With Client-side JavaScript, we are able to interpreter with the Document Object Model (DOM) of a web browser. On Client-Side, JavaScript add interactive features to your page. JavaScript allowing us to do plenty of tasks on Client-Side like mathematical calculations, form validation, drop down and sliding menus, message tickers, work with events, work with cookies, add special effects and animation, develop interactive games, customize graphics selections, and create security passwords and many more.

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Learning JavaScript tutorial – an introduction with JavaScript

JavaScript is most popular, commonly used, object-oriented, client-side scripting language. JavaScript widely used in tasks ranging from the form data validation to the development of enhanced user interfaces and dynamic websites. The primary use of Client-side JavaScript is to write functions that are embedded in or included from HTML pages and interact with the Document Object Model (DOM) of the page. Because JavaScript code can run locally in a user’s browser (instead of get parse on a remote server like PHP or ASP.NET), it can respond to user actions quickly, making an application feel more responsive and user friendly.

What can a JavaScript do for a Web Developer?

As a web developer you can use JavaScript to perform various tasks, some of them are as follows…

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Here is the sample JavaScript code to demonstrate that how can we validate a checkbox list inside the aspx page. Just call function vldChkBoxlist() and it will validate your checkbox list.

function vldChkBoxlist()
{
var tableBody = document.getElementById(‘CheckBoxList1’).childNodes[0];
for (var i=0;i<tableBody.childNodes.length; i++)
{
var currentTd = tableBody.childNodes[i].childNodes[0];
var listControl = currentTd.childNodes[0];
if (listControl.checked =true)
{
listControl.checked = false;
}
return false;
}