JavaScript Action Form instance explanation (top) _javascript tips

First, get the form reference

1> through the direct positioning of the way to get

document.getElementById ();
Document.getelementsbyname ();
document.getElementsByTagName ();

2> Get references by collection

Document.forms[]
document.forms["name"
document.forms.name

3> directly by name (applies to forms only)

Document.name

Ii. getting references to form elements

1> Direct Access

document.getElementById ();
Document.getelementsbyname ();
document.getElementsByTagName ();

2> through the collection to obtain

The form object. Elements gets the collection form object for all the elements in the form. elements[subscript] Form object.
elements["name"
Form object. elements.name

3> directly through the form of name

Form object. Name

Common properties and methods of form elements

1> get the value of a FORM element

Form element object. Value Gets or sets the value

2> Property

Disabled Gets or sets whether a form control disables true false
The form points to a reference to the form that contains this element

3> method

Blur () lost focus
Focus () get focused

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