The window object represents a window in browser. An object of window is created automatically by the browser.
Window is the object of browser, it is not the object of javascript. The javascript objects are string, array, date etc.
Note: if html document contains frame or iframe, browser creates additional window objects for each frame.
Methods of window object
The important methods of window object are as follows:
| Method | Description |
|---|---|
| alert() | displays the alert box containing message with ok button. |
| confirm() | displays the confirm dialog box containing message with ok and cancel button. |
| prompt() | displays a dialog box to get input from the user. |
| open() | opens the new window. |
| close() | closes the current window. |
| setTimeout() | performs action after specified time like calling function, evaluating expressions etc. |
Example of alert() in javascript
It displays alert dialog box. It has message and ok button.
<script type="text/javascript">
function msg(){
alert("Hello Alert Box");
}
</script>
<input type="button" value="click" onclick="msg()"/>Output of the above example
Example of confirm() in javascript
It displays the confirm dialog box. It has message with ok and cancel buttons.
<script type="text/javascript">
function msg(){
var v= confirm("Are u sure?");
if(v==true){
alert("ok");
}
else{
alert("cancel");
}
}
</script>
<input type="button" value="delete record" onclick="msg()"/>Output of the above example
Example of prompt() in javascript
It displays prompt dialog box for input. It has message and textfield.
<script type="text/javascript">
function msg(){
var v= prompt("Who are you?");
alert("I am "+v);
}
</script>
<input type="button" value="click" onclick="msg()"/>Output of the above example
Example of open() in javascript
It displays the content in a new window.
<script type="text/javascript">
function msg(){
open("http://www.javatpoint.com");
}
</script>
<input type="button" value="javatpoint" onclick="msg()"/><script type="text/javascript">
function msg(){
open("http://www.javatpoint.com");
}
</script>
<input type="button" value="javatpoint" onclick="msg()"/>Output of the above example
Example of setTimeout() in javascript
It performs its task after the given milliseconds.
<script type="text/javascript">
function msg(){
setTimeout(
function(){
alert("Welcome to Javatpoint after 2 seconds")
},2000);
}
</script>
<input type="button" value="click" onclick="msg()"/>
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