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Why Because the g_docLoc variable would just point to the same underlying string object as the documentlocation property, and when it changed, you would lose the original value of the document URL
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Creating the User Interface Elements
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The buildBookmarks() function next creates the user interface controls that will be needed to display the bookmarks First, the enclosing <FORM> tag is created, then the <SELECT> list that will hold the bookmarks is created:
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// build the FORM to hold the controls var oForm = documentcreateElement("FORM"); // create the SELECT element for the bookmarks var oSelect = documentcreateElement("SELECT"); oSelectsetAttribute("id","bookmarks");
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The <SELECT>list is also given the ID of bookmarks so it can be referred to later After the select list is created, a text node is created to serve as a label for the list:
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var oText = documentcreateTextNode("Select a Bookmark: ");
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Then the text label and <SELECT>list are added to the form element:
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oFormappendChild(oText); oFormappendChild(oSelect);
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Finally, the Go button is created and added to the form:
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var oBtn = documentcreateElement("INPUT"); oBtnsetAttribute("type","button"); oBtnsetAttribute("value","Go"); oBtnsetAttribute("onClick","jumpToBookMark()"); oFormappendChild(oBtn);
The Document Object Model: Processing Structured Documents
The script sets the value of the onClick attribute to be the jumpToBookMark() function, which is part of the script that is included in the page (discussed shortly)
Building the Bookmark List
Once the user interface controls have been created, the script scans the document for all <SPAN> tags and builds the list of bookmarks The line
var aMarkElements = documentgetElementsByTagName("SPAN");
retrieves all of the <SPAN> elements in the page However, the page may already be teeming with existing <SPAN> tags, and you are only interested in the ones that have been marked as representing a bookmark The <SPAN> tags have special bookmark attributes, so you need to filter these tags out and use them to build the bookmark list This is done by iterating over the list of <SPAN> elements and looking for those with bookmark attributes:
for (i=0; i<aMarkElementslength;i++) { if (aMarkElements[i]getAttribute("bookmark") != "") {
If the getAttribute() call indicates the presence of a bookmark attribute, a bookmark entry is constructed This is done in two steps: first, the named anchor tag that will serve as the destination for the bookmark link is created
var oAnchor = buildNamedAnchor(); aMarkElements[i]innerHTML = oAnchor + aMarkElements[i]innerHTML;
You have to be a little tricky here because IE has a bug in it that prevents the setting of the NAME attribute on <A> tags The workaround is to build the string of HTML to represent the <A> tag and then use the innerHTML property to add it to the document The buildNamedAnchor() function takes care of creating the HTML string for the <A> tag:
function buildNamedAnchor() { return "<A NAME=bookmark" + g_anchorCount + "></A>"; }
The string returned is then inserted into the innerHTML of the <SPAN> tag that represents the bookmark
8: Providing Automatic Document Navigation
After the named anchor has been created, the second step is that each of the <OPTION> tags for the <SELECT> list needs to be created This is accomplished by the buildBookmarkRef() function:
var sName = aMarkElements[i]getAttribute("bookmark"); var oOption = buildBookmarkRef(sName);
The buildBookmarkRef() function takes the value of the bookmark attribute and creates an <OPTION> tag for it:
function buildBookmarkRef(sName) { var oOptionTag = documentcreateElement("OPTION"); // set the value oOptionTagsetAttribute("value","bookmark"+g_anchorCount); // create the display name var oOptionText = documentcreateTextNode(sName); oOptionTagappendChild(oOptionText); return oOptionTag; }
The <OPTION> tag is created by a call to createElement, and the value attribute is set to the string bookmarkX, where X is the value of the g_anchorCount global counter The display name for the <OPTION> tag is created as a text node and appended to the <OPTION> element, which is then returned and added to the <SELECT> node Then the g_anchorCount counter is incremented, and the process repeats for each of the remaining <SPAN> tags:
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