Three Object Models for Javascript

1. HTML Object Model GET or SET:

document.formname.elementname.value GET e.g., whatisID = document.form1.studentID.value;
or
SET e.g., document.form1.studentID.value = '1234567';
   or
document.forms[ i ].elementname.valueGET e.g., whatisID = document.forms[0].studentID.value;
or
SET e.g., document.forms[0].studentID.value = '1234567';
   or
document.formname.elements[ j ].valueGET e.g., whatisID = document.form1.elements[14].value;
or
SET e.g., document.form1.elements[14].value = '1234567';
   or
document.forms[ i ].elements[ j ].valueGET e.g., whatisID = document.forms[0].elements[14].value;
or
SET e.g., document.forms[0].elements[14].value = '1234567';

2. XML Object Model

GET or SET:

For IE browser:       root.childNodes[ i ].childNodes[ j ].textGET e.g., whatisID = root.childNodes[student_num].childNodes[ 1 ].text;
or
SET e.g.,root.childNodes[student_num].childNodes[ 1 ].text = '1234567';
   or
For all browsers:       root.childNodes[ i ].childNodes[ j ].childNodes[ 0 ].nodeValueGET e.g., whatisID = root.childNodes[student_num].childNodes[ 1 ].childNodes[0].nodeValue;
or
SET e.g., root.childNodes[student_num].childNodes[ 1 ].childNodes[0].nodeValue = '1234567';

3. Document Object Model

GET or SET:

the object's value:                       some_id_string.innerHTMLGET e.g., essay = studentEssayTextarea.innerHTML;
or
SET e.g., studentEssayTextarea.innerHTML = "Type your essay here";
    or
the object's value:                       document.getElementById("some_id_string").innerHTMLGET e.g., essay = document.getElementById('essay').innerHTML;
or
SET e.g., document.getElementById('essay').innerHTML = "Type your essay here";

GET or SET:

the object's CSS style property:             some_id_string.style.css_propertyGET e.g., topColor = topTitle.style.color;
or
SET e.g., topTitle.style.color = "DarkRed";
    or
the object's CSS style property:             document.getElementById( "some_id_string").style.css propertyGET e.g., topColor = document.getElementById("topTitle").style.color;
or
SET e.g., document.getElementById("topTitle").style.color = "DarkRed";