Retrieves an object that specifies the bounds of a collection of TextRectangle objects. SyntaxoRect = object.getBoundingClientRect() Return ValueReturns a TextRectangle object. Each rectangle has four integer properties (top, left, right, and bottom) that represent a coordinate of the rectangle, in pixels.ResThis method retrieves an object that exposes the left, top, right, and bottom coordinates of the union of rectangles relative to the client's upper-left corner. In Microsoft® Internet Explorer 5, the window's upper-left is at 2,2 (pixels) with respect to the true client.ExamplesThis example uses the getClientRects and getBoundingClientRect methods to highlight text lines in an object.HideExample<HEAD> <SCRIPT> var rcts; var keyCount=0; function Highlight(obj) { rcts = obj.getClientRects(); rctLength= rcts.length; if (keyCount > rctLength-1) { idBeige.style.display="none"; keyCount = 0 } // set the rendering properties for the yellow DIV cdRight = rcts[keyCount].right + idBody.scrollLeft; cdLeft = rcts[keyCount].left + idBody.scrollLeft; cdTop = rcts[keyCount].top + idBody.scrollTop; cdBottom = rcts[keyCount].bottom + idBody.scrollTop; idYellow.style.top = cdTop; idYellow.style.width = (cdRight-cdLeft) - 5; idYellow.style.display = 'inline'; // set the rendering properties for the beige DIV bndRight = obj.getBoundingClientRect().right + idBody.scrollLeft; bndLeft = obj.getBoundingClientRect().left + idBody.scrollLeft; bndTop = obj.getBoundingClientRect().top + idBody.scrollTop; idBeige.style.top = bndTop; idBeige.style.width = (bndRight-bndLeft) - 5; idBeige.style.height = cdTop - bndTop; if (keyCount>0){ idBeige.style.display = 'inline'; } keyCount++; } </SCRIPT> </HEAD> <BODY ID="idBody"> <DIV ID="oID_1" onclick="Highlight(this)" onkeydown="Highlight(this)"> A large block of text should go here. Click this block of text multiple times to see each line highlight with every click of the mouse button. Once each line has been highlighted, the process begins again starting with the first line. </DIV> <DIV STYLE="position:absolute; left:5; top:400; z-index:-1; background-color:yellow; display:none" ID="idYellow"></DIV> <DIV STYLE="position:absolute; left:5; top:400; z-index:-1; background-color:beige; display:none" ID="idBeige"></DIV> </BODY> Show Me This example uses the TextRectangle collection with the getClientRects and getBoundingClientRect methods to determine the position of the text rectangle within an element. In each line, the left-justified text does not extend to the right margin of the box that contains the text. Using the collection, you can determine the coordinates of the rectangle that surrounds only the content in each line. The example code reads these rectangle coordinates and instructs the ball to move over the text only, and not to the end of the line.HideExample<HEAD> <SCRIPT> var timid = -1; var timoID_2 = -1; var nLine; var nPosInLine; var oRcts; var nDivLen; var nEraser; function LoadDone() { oTextRange = document.body.createTextRange(); // Get bounding rect of the range oRcts = oTextRange.getClientRects(); nLine = 0; oBndRct = obj.getBoundingClientRect(); nDivLen = oBndRct.right - oBndRct.left + 1; MoveTo(); } function MoveTo() { if (nLine >= oRcts.length) { nLine = 0; } obj.style.top = oRcts[nLine].top; nPosInLine = oRcts[nLine].left; nEraser = 0; timoID_2 = setInterval("MoveToInLine()",60); } function MoveToInLine() { if (nPosInLine >= oRcts[nLine].right - nDivLen) { clearInterval(timoID_2); timoID_2 = -1; obj.style.left = oRcts[nLine].right - nDivLen; nLine++; timid = setTimeout("MoveTo()", 100); return; } if (nEraser == 0) { nEraser = 1; } else { nEraser = 0; } im.src = "../common/dot.gif"; obj.style.left = nPosInLine; nPosInLine += 3; } function End() { if(timid != -1) { clearInterval(timid); timid = -1; } if(timoID_2 != -1) { clearInterval(timoID_2); timoID_2 = -1; } } </SCRIPT> </HEAD> <BODY ID="bodyid" onload="LoadDone()" onresize="End();LoadDone();" onunload="End()"> <P STYLE="text-align:center"> <B>The quick brown fox jumps over the lazy dog.</B> </P> <DIV ID="obj" STYLE="position:absolute"> <IMG ID="im" SRC="../common/dot.gif" BORDER=0 HEIGHT=16 WIDTH=16> </DIV> </BODY>
Return ValueReturns a TextRectangle object. Each rectangle has four integer properties (top, left, right, and bottom) that represent a coordinate of the rectangle, in pixels.ResThis method retrieves an object that exposes the left, top, right, and bottom coordinates of the union of rectangles relative to the client's upper-left corner. In Microsoft® Internet Explorer 5, the window's upper-left is at 2,2 (pixels) with respect to the true client.ExamplesThis example uses the getClientRects and getBoundingClientRect methods to highlight text lines in an object.HideExample<HEAD>
<SCRIPT>
var rcts;
var keyCount=0;
function Highlight(obj) {
rcts = obj.getClientRects();
rctLength= rcts.length;
if (keyCount > rctLength-1) {
idBeige.style.display="none";
keyCount = 0
}
// set the rendering properties for the yellow DIV
cdRight = rcts[keyCount].right + idBody.scrollLeft;
cdLeft = rcts[keyCount].left + idBody.scrollLeft;
cdTop = rcts[keyCount].top + idBody.scrollTop;
cdBottom = rcts[keyCount].bottom + idBody.scrollTop;
idYellow.style.top = cdTop;
idYellow.style.width = (cdRight-cdLeft) - 5;
idYellow.style.display = 'inline';
// set the rendering properties for the beige DIV
bndRight = obj.getBoundingClientRect().right +
idBody.scrollLeft;
bndLeft = obj.getBoundingClientRect().left +
idBody.scrollLeft;
bndTop = obj.getBoundingClientRect().top +
idBody.scrollTop;
idBeige.style.top = bndTop;
idBeige.style.width = (bndRight-bndLeft) - 5;
idBeige.style.height = cdTop - bndTop;
if (keyCount>0){
idBeige.style.display = 'inline';
}
keyCount++;
}
</SCRIPT>
</HEAD>
<BODY ID="idBody">
<DIV ID="oID_1" onclick="Highlight(this)"
onkeydown="Highlight(this)">
A large block of text should go here. Click this
block of text multiple times to see each line
highlight with every click of the mouse button.
Once each line has been highlighted, the process
begins again starting with the first line.
</DIV>
<DIV STYLE="position:absolute; left:5; top:400;
z-index:-1; background-color:yellow; display:none"
ID="idYellow"></DIV>
<DIV STYLE="position:absolute; left:5; top:400;
z-index:-1; background-color:beige; display:none"
ID="idBeige"></DIV>
</BODY>
Show Me
This example uses the TextRectangle collection with the getClientRects and getBoundingClientRect methods to determine the position of the text rectangle within an element. In each line, the left-justified text does not extend to the right margin of the box that contains the text. Using the collection, you can determine the coordinates of the rectangle that surrounds only the content in each line. The example code reads these rectangle coordinates and instructs the ball to move over the text only, and not to the end of the line.HideExample<HEAD>
<SCRIPT>
var timid = -1;
var timoID_2 = -1;
var nLine;
var nPosInLine;
var oRcts;
var nDivLen;
var nEraser;
function LoadDone() {
oTextRange = document.body.createTextRange();
// Get bounding rect of the range
oRcts = oTextRange.getClientRects();
nLine = 0;
oBndRct = obj.getBoundingClientRect();
nDivLen = oBndRct.right - oBndRct.left + 1;
MoveTo();
}
function MoveTo() {
if (nLine >= oRcts.length) {
nLine = 0;
}
obj.style.top = oRcts[nLine].top;
nPosInLine = oRcts[nLine].left;
nEraser = 0;
timoID_2 = setInterval("MoveToInLine()",60);
}
function MoveToInLine() {
if (nPosInLine >= oRcts[nLine].right - nDivLen) {
clearInterval(timoID_2);
timoID_2 = -1;
obj.style.left = oRcts[nLine].right - nDivLen;
nLine++;
timid = setTimeout("MoveTo()", 100);
return;
}
if (nEraser == 0) {
nEraser = 1;
}
else {
nEraser = 0;
}
im.src = "../common/dot.gif";
obj.style.left = nPosInLine;
nPosInLine += 3;
}
function End() {
if(timid != -1) {
clearInterval(timid);
timid = -1;
}
if(timoID_2 != -1) {
clearInterval(timoID_2);
timoID_2 = -1;
}
}
</SCRIPT>
</HEAD>
<BODY ID="bodyid" onload="LoadDone()"
onresize="End();LoadDone();" onunload="End()">
<P STYLE="text-align:center">
<B>The quick brown fox jumps over the lazy dog.</B>
</P>
<DIV ID="obj" STYLE="position:absolute">
<IMG ID="im" SRC="../common/dot.gif"
BORDER=0 HEIGHT=16 WIDTH=16>
</DIV>
</BODY>
该手册说明如下说明本手册由 lemon 整理编辑 OICQ:27550369 E_mail:[email protected] [email protected]
本手册的内容全部来自Microsoft MSDN Library,若有疑问可直接访问Microsoft MSDN Library。
由于链接众多,错误之处在所难免,希望各位用户指正。由此带来的一切后果,本人概不负责。
这里有...我很奇怪,为啥w3c不提供类似的支持呢?