The length Property

We've already used the length property, which just returns the number of items in an array or collection. You can see the support for this property in Table 5.33.

Table 5.33. The length Property

Property	NS2	NS3	NS4	NS6	IE3a	IE3b	IE4	IE5	IE5.5	IE6
`length`	x	x	x	x	x	x	x	x	x	x
	Read-only
	Type: Integer

Here's an example from earlier in this chapter where we're using the length property of the children collection to loop over all the child HTML elements in a form:

(Listing 05-05.html on the web site)

 <HTML>      <HEAD>          <TITLE>Using the children Property</TITLE>      </HEAD>      <BODY>          <H1 NAME="header1">Using the children Property</H1>          <FORM NAME="form1">              <INPUT NAME="button1" TYPE="BUTTON" ONCLICK="alerter()" VALUE="Click Me!">              <INPUT NAME="text1" TYPE="TEXT">          </FORM>          <SCRIPT LANGUAGE="JavaScript">              <!--  for(var loopIndex=0; loopIndex < form1.children.length; loopIndex++){   document.write(form1.children[loopIndex].name + "<BR>")   }  // -->          </SCRIPT>      </BODY>  </HTML>