How to Create a JavaScript Alerts?
Demo- Create JavaScript Alerts.
JavaScript Alert Boxes | ||
| JavaScript alert box show a message to the user. You can display the message with multiple lines using '\n' | ||
| » | How to create Simple JavaScript Alert Box | |
| » | How to break lines in a javascript alert message | |
| » | Display custom message in javascript alert | |
| Enter your Message | ||
| » | Display screen size using an alert | |
| » | Display the URL of current web page | |
JavaScript Prompt Messages | ||
| JavaScript prompt dialog box provide a text box to the user to enter text input. Also you can define a default value. It returns user's input if the user has entered a value. Otherwise it returns the default value. But it returns 'null' if there is no any value present in the text box. | ||
| » | Prompt user name | |
| » | Adding two numbers using prompt messages | |
JavaScript Confirm Messages | ||
| JavaScript confirm dialog box returns true or false according to user response. If user clicks on 'Yes' button it returns 'true' and if user clicks on 'Cancel' button or close the message window it returns 'false' | ||
| » | Simple confirm message | |
| » | Use confirm dialog to go to another web page | |
Try It!
1. Example code for create a alert box in javascript.
JavaScript Code
<script type="text/javascript" language="javascript">
<!--
function simpleAlert(){
window.alert("This is a simple javascript alert");
return false;
}
-->
</script>
HTML Code
<html>
<head><title>How to create a simple alert </title>
</head><body>
<table border="0"><tr>
<td> <input name="btnmessage" type="submit" id="btnmessage" onclick="javascript:simpleAlert();" value="Click Here " /></td>
<td> </td></tr>
</table>
</body>
</html>
2. Example code for create a multi line alert in JavaScript.
JavaScript Code
<script type="text/javascript" language="javascript">
<!--
function lineBreakAlert(){
window.alert("You can display multiple lines in your message\n1.This is the second line\n2.This is third line\nUse \'\\n\' to break lines in your message");
return false;
}
-->
</script>
HTML Code
<html>
<head><title>How to create a multiple line alert </title>
</head><body>
<table border="0"><tr>
<td> <input name="btnmessage" type="submit" id="btnmessage" onclick="javascript:lineBreakAlert();" value="Click Here " /></td>
<td> </td></tr>
</table>
</body>
</html>
3. Example code for create a prompt dialog box in JavaScript.
JavaScript Code
<script type="text/javascript" language="javascript">
<!--
function promptName(){
var name=window.prompt("Please enter your Name","");
if(name==null){
alert("Please enter your name");
return false;
}else{
if(name!=""){
alert("Your Name is "+name);
return false;
}else{
alert("Please enter your name");
return false;
}
}
}
-->
</script>
HTML Code
<html>
<head><title>How to create a multiple line alert </title>
</head><body>
<table border="0"><tr>
<td> <input name="btnmessage" type="submit" id="btnmessage" onclick="javascript:promptName();" value="Click Here " /></td>
<td> </td></tr>
</table>
</body>
</html>
4. Example code for create a confirm dialog box in JavaScript.
JavaScript Code
<script type="text/javascript" language="javascript">
<!--
function simpleConfirm(){
var response=confirm("Click \'Ok\' or \'Cancel\'");
alert("You clicked "+(response==true?"Ok":"Cancel")+" button");
}
-->
</script>
HTML Code
<html>
<head><title>How to create a confirm dialog box </title>
</head><body>
<table border="0"><tr>
<td> <input name="btnmessage" type="submit" id="btnmessage" onclick="javascript:simpleConfirm();" value="Click Here " /></td>
<td> </td></tr>
</table>
</body>
</html>
JavaScript Validation
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