Vbscript what type

If you want your webpage to be more lively and interactive, then you can incorporate VBScript in your code. VBScript is just a scripting language. So, it cannot run its code on its own. It needs a bigger programming language to host it. Open your text editor Here, Notepad is used. You can use whichever text editor you want and add the following lines of code. Now your text editor will look like this the appearance and layout could be different based on the text editor you use :. If you want to get the type name of an object assigned to a variable with Set , you can use TypeName instead.

This version invests more effort setting up the dictionary, but then looks up any type in one check fingers crossed rather than checking every single type every single time. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.

Learn more. Asked 11 years, 3 months ago. Active 5 years, 2 months ago. Viewed 67k times. How do I get the type of a variable using VBScript?

Improve this question. Daniel Imms Ash Burlaczenko Ash Burlaczenko Add a comment. Active Oldest Votes. Returns a value indicating the subtype of a variable. You can name the variable the way you want. It can be short names like x, y or z or more self-describing names like student, Name, salary etc. Providing clear and meaningful names to variables is considered a good programming practice.

For declaring variables, you need to use the keyword Dim. Just declaring the VBS variables will not help you, use it. You will have to assign a value to it at some point or another and this process is known as initializing the variable.

If you are planning to declare a variably named salary, then you can code like this:. The important thing you need to make sure is that you should not assign a value to the variable as and when you declare it. Suppose you write a statement like this:. Step 2 Save this file as variable. Now, you will see the value John on the browser. Again save the file and refresh the IE browser if it is already opened or open the file in the IE browser.

You might be wondered to see nothing; neither John nor Smith. The problem here is that you tried to assign the value to the variable while declaring it which is not allowed. VBScript provides you the freedom to use variables without declaring it called loose binding. But, it is not at all a good programming practice. If you use a variable without declaring it and misspell the same variable when you use it again, VBScript will not prompt you of the error.

So to make the code easier to read and to identify the errors, you should use the Option Explicit statement at the beginning of your code so that you will be forced to declare all your variables even if you forget to do so. Let's look at the range of types or the different types of data that a variant can hold:.

Empty is a type that consists of a single value, also called Empty , that is automatically assigned to new variables when you declare them, but before you explicitly assign a value to them.

For instance, in the code fragment:. In addition, a variable's type is Empty if it has been explicitly assigned a value of Empty , as in the following code fragment:. Null is a special type that consists of a single value, also called Null , that is used to indicate that a variable does not contain any valid data.

Typically, a Null is used to represent missing data. For instance, a variable called JanSales might be assigned a value of Null if the total of January's sales is unknown or unavailable. This must be done by explicit assignment, as in the statement:.

Because it represents missing data, once a Null value is assigned to a variable, it propagates to any variable whose value results from the value of the original variable. For instance, in the code. Because the Null type represents missing or unknown data, this makes sense: if March's sales data is unknown, then any value that wholly or partially results from it, such as the total sales for the first quarter, must also be unknown.

The Boolean type can contain either of two values, True or False. The keywords True and False are constants if you're not sure what a constant is; see Section 3. Many object properties have possible values of True or False , such as the Drive object's IsReady property.

In addition, Boolean variables within programs often serve as flags to control program flow, as the following code fragment shows:.

Note that this example toggles or reverses the value of myBool within the If End If construct. A Byte is the smallest numeric type available in VBScript. One byte 8 binary bits can represent integer numbers, ranging from 0 to in decimal or 00 to FF in hexadecimal.

Because the Byte is an unsigned data type, only zero or positive integers are valid Byte values. Attempting to convert a value outside this range to a Byte results in a runtime error.

An Integer is a whole number that VBscript uses two bytes or 16 bits to store in memory. Since one bit is used to represent the sign either positive or negative , the value of Integer data can range from , to 32, Attempting to convert a value outside this range to an Integer results in a runtime error. A Long is a signed integer that VBscript stores in four bytes or 32 bits of memory. This allows it to hold a far greater range of negative or positive numbers than the Integer type; the value of a Long can range from -2,,, to 2,,, The three numeric data types that we've examined so far Byte, Integer, and Long are all integers; they're unable to represent fractional numbers.

Fractions can be handled by a floating-point data type, two of which are available in VBScript. The first is Single, which is an abbreviation for single precision; it represents numbers with about seven digits of precision. Because of the large and small numbers involved, we are forced to specify the ranges as exponential numbers. There are two ranges, one for negative values and one for positive values.

A negative single precision value can range from A Single can also have a value of zero. If you need to use a floating-point number in VBScript, there is no reason to use a Single; use a Double instead. Generally, Singles are used because they offer better performance than Doubles, but this is not true in VBScript. Not only are Singles not smaller than Doubles in the VBScript implementation, but the processor also converts Singles to Doubles, performs any numeric operations, and then converts Doubles back to Singles.

The Double type stores a double precision floating-point number; basically, it's the industrial-strength version of the Single data type. Its value can range from A Double can also have a value of zero. The Date type represents the date or time. If the number holds a date value, the earliest date that can be represented is January 1, , and, taking the view that our web sites will be around for a long time, the furthest into the future that we can go is December 31,