The above statement is used to access the jth form element within the form exforsys. If a user wants to get the total number of form elements within the form exforsys, it can be written by the following statement:
Properties of elements object:
The length property of elements object returns the total number of elements within the form. The example above depicts the usage of this property.
The type property of elements object is used to return the type of the form element accessed. The returned value from this property would be a string type. In other words, the type of form elements that are returned from this property can be any one of these: button, checkbox, file, hidden, image, password, radio, reset, submit, text, textarea, select-one, select-multiple
The above statement returns the type of the jth form element exforsys.
An example to understand all the concepts of elements objects discussed above in detail:
In the above example, function testing can be used to check if any text box in a form from the function call has been left empty. From each element on the form where the function testing is called, using for loop on the elements array accesses this. The for loop runs until the elements.length returns the total number of elements within the form. Each element in the form is checked for text box type by using the if statement:
When if returns true then the value of this text box element is checked for empty by the if statement:
If this also returns true then an error message is generated for entering value and loop breaks with a false value returned to the function call.
Properties of embed object:
The programmer can make use of <embed> tag to embed Plug-in documents in a web page. The concept Plug-in documents will be detailed in later sections of this tutorial.
General syntax of using embed tag is as follows:
In the above, the SRC attribute or a Type attribute is mandatory. The user can include the remainder of the attributes mentioned above when needed.
The SRC attribute of the embed tag denotes the documents to be embedded and displayed in the plug-in. This attribute is used more often than the Type attribute.
For example, an example to understand the usage of <embed> tag with SRC attribute.
As the name implies, the Height attribute specifies the vertical dimension of the window area assigned to plug-in.
As the name implies, the Width attribute specifies the horizontal dimension of the window area assigned to plug-in.
Denotes the name by which the user can access the associated plug-in object.
This attribute helps the user to make the plug-in object visible or hidden as needed.
This attribute denotes the mode of the plug-in color palette.
The units attribute denotes the units by which the Height and Width attributes are ascribed. The default unit is pixels.