html checkbox form

Checkboxes

Checkboxes are used when you want the user to select one or more options of a limited number of choices.

<form><br /> I have a bike:<input type="checkbox" name="vehicle" value="Bike" />I have a car:<input type="checkbox" name="vehicle" value="Car" />I have an airplane:<br /> <input type="checkbox" name="vehicle" value="Airplane" /></form>
How it looks in a browser:

I have a bike:
I have a car:
I have an airplane:

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html radio form

Radio Buttons

Radio Buttons are used when you want the user to select one of a limited number of choices.
<form><br /> <input type="radio" name="sex" value="male" /> Male<br /> <input type="radio" name="sex" value="female" /> Female<br /> </form>

How it looks in a browser:

Male
Female

Note that only one option can be chosen.

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html input form

Input

The most used form tag is the <input> tag. The type of input is specified with the type attribute. The most commonly used input types are explained below.

Text Fields

Text fields(type) are used when you want the user to type letters, numbers, etc. in a form.

example:
<form><br /> First name:<input type="text" name="firstname" /><br /> Last name:<input type="text" name="lastname" /><br /> </form>
result:
First name:

Last name:

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never ending loop

JavaScript for Loops

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The for loop is used when you know in advance how many times the script should run.

Syntax

for (var=startvalue;var<=endvalue;var=var+increment) { code to be executed }

Example

var i=0;
for (i=0;i<=5;i++)
{
document.write("The number is " + i);
document.write("
");
}
 

The example below defines a loop that starts with i=0. The loop will continue to run as long as i is less than, or equal to 5. i will increase by 1 each time the loop runs.
Note: The increment parameter could also be negative, and the <= could be any comparing statement.

Example

If you want a never ending loops, you just decrease your variable.

var i=0;
for (i=0;i<=5;i--)
{
document.write("The number is " + i);
document.write(" ");
}
 

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