時,我有在兩幀頁面的頂部框架下面的代碼:的Javascript事件沒有被正確地設置在封閉稱爲跨框架
function setKeyHook()
{
logMessage("setKeyHook()");
top.frames.BOTTOM.document.onkeydown =
top.frames.TOP.document.onkeydown = function(evt)
{
return function(){
top.frames.TOP.handleKeypress(evt);
};
}(window.event);
}
onload = setKeyHook;
這部作品原稿負載,但是當我把這個函數從另一個框架(通常只有一個框架重新加載)時,鉤子被設置,但是當onkeydown函數觸發時,它不會接收適當的參數,而是evt == null。
完整的代碼如下:
KeyFrameTest.asp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
<html>
<head>
<title>KeyFrameTest</title>
</head>
<frameset Rows="80%,20%">
<frame id="TOP" name="TOP" src="KeyFrameTestTop.asp">
<frame id="BOTTOM" name="BOTTOM" src="KeyFrameTestBottom.asp">
</frameset>
</html>
KeyFrameTestTop.asp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
<html>
<head>
<script type="Text/Javascript">
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g,"");
}
NumElements = 5;
//Alt Vals
ControlCode = 1;
ShiftCode = 2;
ControlShiftCode = 3;
//Key Vals
keyR = 82;
keyJ = 74;
keyI = 73;
keyT = 84;
keyEnter = 13;
//Array Indexs
AltIndex = 0;
KeyIndex = 1;
FuncIndex = 2;
KeyFuncMap = new Array(NumElements);
for (i = 0; i < KeyFuncMap.length; ++i)
{
//Three elements, control or shift, key, function
KeyFuncMap[i] = new Array(3);
}
KeyFuncMap[0][AltIndex] = ControlCode;
KeyFuncMap[0][KeyIndex] = keyR;
KeyFuncMap[0][FuncIndex] = "parent.TOP.logMessage(\"Ctrl + R\")";
KeyFuncMap[1][AltIndex] = ControlCode;
KeyFuncMap[1][KeyIndex] = keyJ;
KeyFuncMap[1][FuncIndex] = "parent.TOP.logMessage(\"Ctrl + J\")";
KeyFuncMap[2][AltIndex] = ControlCode;
KeyFuncMap[2][KeyIndex] = keyI;
KeyFuncMap[2][FuncIndex] = "parent.TOP.logMessage(\"Ctrl + I\")";
KeyFuncMap[3][AltIndex] = ControlCode;
KeyFuncMap[3][KeyIndex] = keyT;
KeyFuncMap[3][FuncIndex] = "parent.TOP.logMessage(\"Ctrl + T\")";
KeyFuncMap[4][AltIndex] = ControlCode;
KeyFuncMap[4][KeyIndex] = keyEnter;
KeyFuncMap[4][FuncIndex] = "parent.TOP.logMessage(\"Ctrl + Enter\")";
function CompleteEvent(e)
{
e.cancelBubble = true;
e.returnValue = false;
}
function logMessage(msg)
{
logBox = parent.TOP.document.getElementById("logBox");
if(logBox.value.trim().length < 1)
{
logBox.value = msg;
}
else
{
logBox.value = logBox.value + "\r\n" + msg;
}
}
function handleKeypress(e)
{
logMessage("handleKeypress(e)");
e = e || window.event ;
if (e == null)
{
logMessage("handleKeypress(e): e == null");
return false;
}
controlVal = getControlVal(e);
for (i = 0; i < KeyFuncMap.length; i++)
{
if (KeyFuncMap[i][AltIndex] == controlVal &&
KeyFuncMap[i][KeyIndex] == e.keyCode)
{
eval(KeyFuncMap[i][FuncIndex]);
CompleteEvent(e);
}
}
}
function getControlVal(e)
{
if (e.ctrlKey && e.shiftKey)
{
return 3;
}
else if (e.ctrlKey)
{
return 1;
}
else if (e.shiftKey)
{
return 2;
}
else return 0;
}
function displayEverything()
{
displayProps(top.frames.TOP, "top.frames.TOP", 0, 1);
displayProps(top.frames.BOTTOM, "top.frames.BOTTOM", 0, 1);
}
function clearLog()
{
logBox = parent.TOP.document.getElementById("logBox");
logBox.value = "";
}
function displayProps(o, name, level, maxLevel)
{
try {
if (level > maxLevel)
return;
for (prop in o){
logMessage(name + "." + prop + " = " + o[prop]);
if (typeof(o[prop]) == "object" && o[prop] != o){
displayProps(o[prop], name + "." + prop, level + 1, maxLevel);
}
}
}
catch (ex){
logMessage(ex.toString());
}
}
function setKeyHook()
{
logMessage("setKeyHook()");
top.frames.BOTTOM.document.onkeydown =
top.frames.TOP.document.onkeydown = function(evt)
{
return function(){
top.frames.TOP.handleKeypress(evt);
};
}(window.event);
}
onload = setKeyHook;
</script>
</head>
<body>
<h1>Hello</h1>
<textarea id="LogBox" rows="20" cols="80"></textarea><BR>
<input type="Button" value="Display Properties" onClick="displayEverything();"/>
<input type="Button" value="Clear Log" onClick="clearLog();"/>
</body>
</html>
KeyFrameTestBottom.asp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
<html>
<head>
</head>
<body>
<p>Press Keys Here</p>
<input type="Button" value="Reset Handlers"
onclick="top.frames.TOP.setKeyHook();">
</body>
</html>
要重新創建問題,請右鍵單擊底部框架,單擊刷新,單擊「重置掛鉤」,然後按鍵。
相關問題:Handle keyPress Accross Frames in IE
我也看到了有關Javascript closures的文章,但我不知道如何將其應用。
對不起,問題的狹隘性,但我真的不知道Javascript足以找出這個竅門。
不起作用。我仍然得到「handleKeypress(e):e == null」。 – 2009-06-29 18:27:58
我認爲這會在IE如何處理事件(全局事件對象vs傳遞事件對象)方面出現弱點。讓我想出另一個解決方案。 – 2009-06-29 18:54:04