w3r-javascript03: alert - prompt - confirm Dialog Boxes
alert - Dialog box
alert() is a simple function to display a message to a dialog box (also called alert box). Here is a simple example to display a text in the alert box.
<!DOCTYPE html> <html lang="en"> <head> <meta charset=utf-8> <title>JavaScript alert box example-2</title> </head> <body> <h1 style="color: red">JavaScript alert() box example</h1> <hr /> <script type="text/javascript"> mess1='Highest marks in Mathematics : '; math=99; alert(mess1+math); </script> </body> </html>
prompt - Dialog box
The alert() method can not interact with the visitor. To interact with the user we use prompt(), which asks the visitor to input some information and stores the information in a variable.
See the following web document.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<title>JavaScript prompt() example-2</title>
</head>
<body>
<script type="text/javascript">
visiter_name = prompt("Input your name : ")
if(visiter_name != null && visiter_name != "")
alert("Your Name is : "+visiter_name);
else
alert("Blank name ...!")
</script>
</body>
</html>confirm - Dialog box
Confirm() displays a dialog box with two buttons, OK and Cancel and a text as a parameter. If the user clicks on OK button, confirm() returns true and on clicking Cancel button, confirm() returns false.
See the following web document.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<title>JavaScript confirm box example </title>
</head>
<body>
<h1 style="color: red">JavaScript confirm() box example</h1>
<hr />
<script type="text/javascript">
mess1='Press Ok to Continue.';
math=99;
x = confirm(mess1);
if (x == true)
{
alert("You have clicked on Ok Button.");
}
else
{
alert("You have clicked on Cancel Button."); }
</script>
</body>
</html> 相关推荐
LuAndy 2020-08-15
powrexly 2020-07-20
loviezhang 2020-06-16
songerxing 2020-01-04
wangyjbk 2019-12-27
itjavashuai 2019-12-15
zhaijunliang00 2019-11-24
zhihuijiao 2019-11-19
whutjiajiao 2019-09-08
waitzkj 2019-01-26
WoogeYu 2019-01-26
Ping 2019-07-01
shixiaoguo0 2017-05-09
heavstar 2019-06-30
Mrwind 2019-06-27
数据库之扑朔迷离 2019-06-26
XaverSun 2013-11-15
Jensony 2019-06-26