JavaScript String Split Function

split()

The split() method splits (for lack of a better word) a string up into substrings and returns them in an array. It accepts a string or regular expression argument containing the delimiter at which the string will be broken.

<script type="text/javascript">
var testString = "It is very nice script";

var testSplitResult = testString.split(" ");

for(i = 0; i < testSplitResult.length; i++){
    document.write("<br /> Element " + i + " = " + testSplitResult[i]);
}
</script>

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JavaScript Redirect

<script type="text/javascript">

window.location = "http://www.yoursite.com/"

</script>

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JavaScript System Dialogs alert(),confirm(),prompt()

The browser is capable of invoking system dialogs to display to the user through the alert(),
confirm(), and prompt() methods. These dialogs are not related to the web page being displayed
in the browser and do not contain HTML. Their appearance is determined by operating system and/
or browser settings rather than CSS. Additionally, each of these dialogs is synchronous and modal,
meaning code execution stops when a dialog is displayed, and resumes
after it has been dismissed.

The alert() method has been used throughout this book. It simply
accepts a string to display to the user. When alert() is called, a
system message box displays the specifi ed text to the user, followed by
a single OK button.

Alert dialogs are typically used when users must be made aware of something that they have no
control over, such as an error. A user’s only choice is to dismiss the dialog after reading the message.
The second type of dialog is invoked by calling confirm(). A confi rm dialog looks similar to an
alert dialog in that it displays a message to the user. The main difference between the two is the

To determine if the user clicked OK or Cancel, the confirm() method
returns a Boolean value: true if OK was clicked, or false if Cancel
was clicked or the dialog box was closed by clicking the X in the
corner. Typical usage of a confi rm dialog looks like this:

if (confirm(“Are you sure?”)) {
alert(“I’m so glad you’re sure! “);
} else {
alert(“I’m sorry to hear you’re not sure. “);
}

If the OK button is clicked, prompt() returns the value in the text box; if Cancel is clicked or the
dialog is otherwise closed without clicking OK, the function returns null. Here’s an example:

var result = prompt(“What is your name? “, “”);
if (result !== null) {
alert(“Welcome, “ + result);
}

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JavaScript Variables

Variables store a value you can refer to later in the script. Variable names
can be nearly any valid identifi er. A JavaScript identifi er is a word that
contains only letters, numbers, $, and _, and that doesn’t start with a
number.
Variables are a great demonstration of how statements and expressions
can be combined. You use a variable declaration statement to create a
variable.

var myVariable;

If you already have a variable, you can use a variable assignment expression
to assign it a value.

myVariable = 42;
42
You can combine a variable declaration with an assignment expression.
var myVariable = 42;
You can also string together several variable declarations with commas.
Don’t forget the commas, though! Leaving off a comma can have the
unintended side effect of declaring a global variable when you don’t
mean to do that.var variable1 = 4,
variable2 = 8,
variable3 = 15;

JavaScript has a relatively small number of built-in data types, including
these common types:
var myNumber = 42;
var myString = "A string of text";
var myBoolean = true;
var myArray = [myNumber, myString, myBoolean];

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JavaScript Alert

The JavaScript alert is a dialogue box that pops up and takes the focus away from the current window and forces the web browser to read the message.


1.
<form>
<input type="button" onclick=
"alert('Are you sure you want to call')"
value="See">
</form>


2.
function myFunc() {
alert("executing myFunc!");
return true;
}

3.

for (var i = 0; i < 10; i++) {
var link = document.createElement("a");
link.innerHTML = "Link " + i;
link.href = "#";
link.onclick = function() {
alert("This is link " + i);
return false;
};
document.body.appendChild(link);
}

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Web Application with PHP

PHP embedded in HTML

<html>
<head><title>Example 1</title></head>
<body>
<?php
/* If it is April 1st, we show a quote */
if (date('md' == '0401')) {
echo 'A bookstore is one of the only pieces of evidence we have '.
'that people are still thinking. <i>Jerry Seinfeld</i>';
} else {
echo 'Good morning!';
}
?>
</body>
</html>

The line
<?php
begins the PHP section embedded into the HTML code; the
line
?>
ends the PHP section. Notice that the code uses echo
to send the output.
When the text is so simple, the echo
statements are acceptable.

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