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: http://www.arcetri.astro.it/irlab/doc/library/javascript/clientreference/anchor.htm
Дата изменения: Thu Oct 7 13:13:34 1999 Дата индексирования: Sat Dec 22 14:23:57 2007 Кодировка: Поисковые слова: accretion disk |
JavaScript 1.2: added |
A tag or calling the String.anchor method. The JavaScript runtime engine creates an Anchor object corresponding to each A tag in your document that supplies the NAME attribute. It puts these objects in an array in the document.anchors property. You access an Anchor object by indexing this array.
To define an anchor with the String.anchor method:
theString.anchor(nameAttribute)where:
theString | |
nameAttribute |
A tag, use standard HTML syntax. If you specify the NAME attribute, you can use the value of that attribute to index into the anchors array.
Anchor object is also a Link object, the object has entries in both the anchors and links arrays.
| Property |
Description
|
|
| The vertical position of the anchor's top edge, in pixels, relative to the top edge of the document. |
|---|
watch and unwatch methods from Object.
<A NAME="javascript_intro"><H2>Welcome to JavaScript</H2></A>If the preceding anchor is in a file called
intro.html, a link in another file could define a jump to the anchor as follows:
<A HREF="intro.html#javascript_intro">Introduction</A>Example 2: anchors array. The following example opens two windows. The first window contains a series of buttons that set
location.hash in the second window to a specific anchor. The second window defines four anchors named "0," "1," "2," and "3." (The anchor names in the document are therefore 0, 1, 2, ... (document.anchors.length-1).) When a button is pressed in the first window, the onClick event handler verifies that the anchor exists before setting window2.location.hash to the specified anchor name.
link1.html, which defines the first window and its buttons, contains the following code:
<HTML>
<HEAD>
<TITLE>Links and Anchors: Window 1</TITLE>
</HEAD>
<BODY>
<SCRIPT>
window2=open("link2.html","secondLinkWindow",
"scrollbars=yes,width=250, height=400")
function linkToWindow(num) {
if (window2.document.anchors.length > num)
window2.location.hash=num
else
alert("Anchor does not exist!")
}
</SCRIPT>
<B>Links and Anchors</B>
<FORM>
<P>Click a button to display that anchor in window #2
<P><INPUT TYPE="button" VALUE="0" NAME="link0_button"
onClick="linkToWindow(this.value)">
<INPUT TYPE="button" VALUE="1" NAME="link0_button"
onClick="linkToWindow(this.value)">
<INPUT TYPE="button" VALUE="2" NAME="link0_button"
onClick="linkToWindow(this.value)">
<INPUT TYPE="button" VALUE="3" NAME="link0_button"
onClick="linkToWindow(this.value)">
<INPUT TYPE="button" VALUE="4" NAME="link0_button"
onClick="linkToWindow(this.value)">
</FORM>
</BODY>
</HTML>
link2.html, which contains the anchors, contains the following code:
<HTML>
<HEAD>
<TITLE>Links and Anchors: Window 2</TITLE>
</HEAD>
<BODY>
<A NAME="0"><B>Some numbers</B> (Anchor 0)</A>
<UL><LI>one
<LI>two
<LI>three
<LI>four</UL>
<P><A NAME="1"><B>Some colors</B> (Anchor 1)</A>
<UL><LI>red
<LI>orange
<LI>yellow
<LI>green</UL>
<P><A NAME="2"><B>Some music types</B> (Anchor 2)</A>
<UL><LI>R&B
<LI>Jazz
<LI>Soul
<LI>Reggae
<LI>Rock</UL>
<P><A NAME="3"><B>Some countries</B> (Anchor 3)</A>
<UL><LI>Afghanistan
<LI>Brazil
<LI>Canada
<LI>Finland
<LI>India</UL>
</BODY>
</HTML>
Link
name property reflects the value of the NAME attribute.
alert("The first anchor is " + document.anchors[0].name)
text property specifies the string that appears within the A tag.
alert("The text of the first anchor is " + document.anchors[0].text)
Anchor.y
Anchor.x
Last Updated: 05/28/99 11:58:58