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I am using events in the Javascript. But I don't know the exact purpose of using an event.!! Can someone explain me, that why we use Events in JavaScript? Also please tell me the different events that we use in the JavaScript. Since, I have started recently doing the JavaScript, I have not used the events much enough. It will be much better if someone can provide me the coding for the events that are used in JavaScript.!!
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You have the ability to create dynamic web pages by using the JavaScript. Events are actions that can be detected by JavaScript. In other words you can say that an events are the beating heart of any JavaScript application. You can't write scripts without using an event. When the user does something an event takes place. There are also some events that aren’t directly caused by the user: the load event that fires when a page has been loaded, for instance. Hope that you have understood the concepts of the events in JavaScript.
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I think that looking at some example will make you more easy to understand. I have explained you the Resize event. With the help of this event we can detect whenever the window is being resized by the user. Following script demonstrates the Resize event :
Code:<html> <head> <script language="JavaScript"> window.onresize= message; function message() { alert("This window has been resized!"); } </script> </head> <body> So resize the window. </body> </html>
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Every element on a web page has certain events which can trigger a JavaScript. When the user takes action he causes an event. When your script makes the page react to this event, interactivity is born. The following are the examples of events that are used in JavaScript :
- A web page or an image loading.
- Mousing over a hot spot on the web page.
- A mouse click.
- Selecting an input field in an HTML form.
- A keystroke.
- Submitting an HTML form.
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The onLoad and onUnload events are triggered when the user enters or leaves the page. And the onFocus, onBlur and onChange events are often used in combination with validation of form fields. Any script that uses navigator.userAgent for event model detection is worse than useless and should be laughingly dismissed. A script using the Microsoft all container can safely be executed. For writing an event handler, the first step is registering your event handler. Event object contains properties which describe an event. Every time an event occurs an Event object is passed to the event handler.
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The onSubmit event is used to validate ALL form fields before submitting it. The function checkForm() returns either true or false. If it returns true the form will be submitted, otherwise the submit will be canceled. The following is an example, for the same :
If you want to create "animated" buttons, then you can use onMouseOver and onMouseOut.Code:<form method="post" action="trial.htm" onsubmit="return checkForm()">
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