CD-197Appendix F . Examples from Parts III and IV Now, insert this element before the start of the myPobject: myP.insertAdjacentElement( beforeBegin , a) Notice that you have not assigned an idproperty value to the new element. But because the element was inserted by reference, you can modify the inserted object by changing the object stored in the avariable: a.style.color = red The inserted element is also part of the document hierarchy, so you can access it through hierarchy references such as myP.previousSibling. The parent element of the newly inserted element is the BODY. Thus, you can inspect the current state of the HTML for the rendered page by entering the following statement into the topmost text box: document.body.innerHTML If you scroll down past the first form, you can find the

element that you added along with the STYLEattribute. insertAdjacentHTML( location , HTMLtext ) insertAdjacentText( location , text ) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Use The Evaluator (Chapter 13) to experiment with these two methods. The example here demonstrates the result of employing both methods in an attempt to add some HTML to the beginning of the myP element. Begin by assigning a string of HTML code to the global variable a: a = Important News! Because this HTML is to go on the same line as the start of the myP paragraph, use the afterBeginparameter for the insert method: myP.insertAdjacentHTML( afterBegin , a) elementObject.insertAdjacentHTML()
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CD-196 Part VI . Appendixes The response is false because text fragments do not have any nested nodes. But check out the EM element, which is the second child node of the myPelement: document.getElementById( myP ).childNodes[1].hasChildNodes() The answer is true because the EM element has a text fragment node nested within it. Sure enough, the statement document.getElementById( myP ).childNodes[1].childNodes.length yields a node count of 1. You can also go directly to the EM element in your references: document.getElementById( myEM ).hasChildNodes() document.getElementById( myEM ).childNodes.length If you want to see the properties of the text fragment node inside the EM element, enter the following into the lower text box: document.getElementById( myEM ).childNodes[0] You can see that the dataand nodeValue properties for the text fragment return the text all . insertAdjacentElement( location , elementObject) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Use The Evaluator (Chapter 13) to experiment with the insertAdjacentElement() method. The goal of the experiment is to insert a new H1 element above the myPelement. All actions require you to enter a sequence of statements in the topmost text box. Begin by storing a new element in the global variable a: a = document.createElement( H1 ) Give the new object some text: a.innerText = New Header elementObject.insertAdjacentElement()
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CD-195Appendix F . Examples from Parts III and IV document.body.getElementsByTagName( DIV ).length document.getElementById( myTable ).getElementsByTagName( TD ).length Because the getElementsByTagName() method returns an array of objects, you can use one of those returned values as a valid element reference: document.getElementsByTagName( FORM )[0].getElementsByTagName( INPUT ).length getExpression( attributeName ) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example See Listing 15-32 for the setExpression()method. This listing demonstrates the kinds of values returned by getExpression(). hasChildNodes() NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Use The Evaluator (Chapter 13) to experiment with the hasChildNodes() method. If you enter the following statement into the topmost text box: document.getElementById( myP ).hasChildNodes() the returned value is true. You can find out how many nodes there are by getting the length of the childNodes array: document.getElementById( myP ).childNodes.length This expression reveals a total of three nodes: the two text nodes and the EM element between them. Check out whether the first text node has any children: document.getElementById( myP ).childNodes[0].hasChildNodes() elementObject.hasChildNodes()
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CD-194 Part VI . Appendixes Listing 15-27 (continued)

Because the z-indexstyle property of the hiliterelement is set to -1, the element always appears beneath the primary content on the page. If the user selects a line number beyond the current number of lines in the main element, the hiliter element is hidden. getClientRects() NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example See Listing 15-27, which demonstrates the differences between getClientRects() and getBoundingClientRect() and shows how you can use the two together. getElementsByTagName( tagName ) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Use The Evaluator (Chapter 13) to experiment with the getElementsByTagName() method. Enter the following statements one at a time into the upper text box and study the results: document.body.getElementsByTagName( DIV ) elementObject.getElementsByTagName()
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CD-193Appendix F . Examples from Parts III and IV document.all.hiliter.style.pixelWidth = hRight - hLeft document.all.hiliter.style.visibility = visible } else if (n > 0) { alert( The content does not have that many lines. ) document.all.hiliter.style.visibility = hidden } }

getClientRects() and getBoundClientRect() Methods

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Choose a line to highlight: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Full Width (bounding rectangle)

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Continued elementObject.getBoundingClientRect()
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CD-192 Part VI . Appendixes invoked for the main element to capture a snapshot of all TextRectangles for the entire element. This array comes in handy when the script needs to get the coordinates of a rectangle for a single line, as chosen in the SELECT element. Whenever the user chooses a number from the SELECT list and the value is less than the total number of TextRectangleobjects in clientRects, the function begins calculating the size and location of the underlying yellow highlighter. When the Full Width checkbox is checked, the left and right coordinates are obtained from the getBoundingClientRect() method because the entire SPAN element s rectangle is the space you re interested in; otherwise, you pull the leftand right properties from the chosen rectangle in the clientRects array. Next comes the assignment of location and dimension values to the hiliter object s styleproperty. The top and bottom are always pegged to whatever line is selected, so the clientRects array is polled for the chosen entry s topand bottom properties. The previously calculated leftvalue is assigned to the hiliterobject s pixelLeftproperty, while the width is calculated by subtracting the leftfrom the right coordinates. Notice that the topand left coordinates also take into account any vertical or horizontal scrolling of the entire body of the document. If you resize the window to a smaller size, line wrapping throws off the original line count. However, an invocation of hilite()from the onResizeevent handler applies the currently chosen line number to whatever content falls in that line after resizing. Listing 15-27: Using getBoundingClientRect()

fireEvent() Method

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This is a paragraph (with a nested SPAN) that receives click events.

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Control Panel

Cancel event bubbling.

focus() See blur(). getAdjacentText( position ) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Use The Evaluator (Chapter 13) to examine all four adjacent text possibilities for the myP and nested myEM elements in that document. Enter each of the following statements into the upper text box, and view the results: document.all.myP.getAdjacentText( beforeBegin ) document.all.myP.getAdjacentText( afterBegin ) document.all.myP.getAdjacentText( beforeEnd ) document.all.myP.getAdjacentText( afterEnd ) elementObject.getAdjacentText()
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CD-188 Part VI . Appendixes Listing 15-26 (continued) function getEventProps() { var msg = var elem = event.srcElement msg += event.srcElement.tagName: + elem.tagName + n msg += event.srcElement.id: + elem.id + n msg += event button: + event.button return msg } // onClick event handlers for body, myP, and mySPAN function bodyClick() { var msg = Click event processed in BODYnn msg += getEventProps() alert(msg) checkCancelBubble() } function pClick() { var msg = Click event processed in Pnn msg += getEventProps() alert(msg) checkCancelBubble() } function spanClick() { var msg = Click event processed in SPANnn msg += getEventProps() alert(msg) checkCancelBubble() } // cancel event bubbling if check box is checked function checkCancelBubble() { event.cancelBubble = document.controls.bubbleOn.checked } // assign onClick event handlers to three elements function init() { document.body.onclick = bodyClick document.all.myP.onclick = pClick document.all.mySPAN.onclick = spanClick } // invoke fireEvent() on object whose ID is passed as parameter function doFire(objID) { var newEvt = document.createEventObject() newEvt.button = 3 document.all(objID).fireEvent( onclick , newEvt) // don t let button clicks bubble event.cancelBubble = true } elementObject.fireEvent()
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