浏览器总是提示变量未定义
代码大致如下：
<SCRIPT LANGUAGE="JavaScript">
function FillSubject(subjectInfo,selSubject)
{
count=0;
for(i=0;i<subjectInfo.length;i++)
{
selSubject.options[count]=new Option(subjectInfo[i][1],subjectInfo[i][0]);
count=count+1;
}
selSubject.options[0].selected=true;
selSubject.length=count;
}
function _CloseOnEsc() {
if (event.keyCode == 27) { window.close(); return; }
}
function Init() {
// event handlers
document.body.onkeypress = _CloseOnEsc;
btnOK.onclick = new Function("btnOKClick()");
}
function btnOKClick() {
var result;
// error checking
if (!coefficient.value) {
alert("请正确填写系数");
coefficient.focus();
return;
}
result = "+subject_"+subject_id.value+"|"+month.value+"|"+coefficient;
result.collapse(false);
result.select();
window.close();
}
</script>
</HEAD>
<BODY id=bdy style="BACKGROUND: buttonface; COLOR: windowtext" scroll=no onload=Init()>
....
<BUTTON id=btnOK style="LEFT: 31.36em; WIDTH: 5em; TOP: 1.06em; HEIGHT: 1.5em" tabIndex=40 type=submit>
确定
</BUTTON>
运行的时候浏览器就提示
btnOK未定义，但btnOK在“<BUTTON id=btnOK” 定义了。代码哪里有问题呢
问题点数：20、回复次数：6Top
1 楼csongqi（）回复于 2005-09-12 16:16:56 得分 0
这个是一个showModalDialog打开的页面Top
2 楼gu1dai（异域苍穹.百年飞行）回复于 2005-09-12 16:54:56 得分 0
btnOK在函数之后定义，所以错误。
请用document.getElementById('btnOK');取得对象，就不会错了。Top
3 楼gu1dai（异域苍穹.百年飞行）回复于 2005-09-12 16:57:23 得分 0
btnOK = document.getElementById('btnOK');
btnOK.onclick = new Function("btnOKClick()");Top
4 楼csongqi（）回复于 2005-09-12 17:07:06 得分 0
这个问题解决了，十分感谢。还想问一个问题：如何将showModalDialog的变量回传给母窗口？Top
5 楼csongqi（）回复于 2005-09-12 17:11:01 得分 0
我这个代码出处是：
<SCRIPT defer>
function _CloseOnEsc() {
if (event.keyCode == 27) { window.close(); return; }
}
function _getTextRange(elm) {
var r = elm.parentTextEdit.createTextRange();
r.moveToElementText(elm);
return r;
}
function HandleError(message, url, line) {
var str = "An error has occurred in this dialog." + "\n\n"
+ "Error: " + line + "\n" + message;
alert(str);
window.close();
return true;
}
function Init() {
var elmSelectedImage;
var htmlSelectionControl = "Control";
var globalDoc = window.dialogArguments;
//var grngMaster = globalDoc.selection.createRange();
// event handlers
document.body.onkeypress = _CloseOnEsc;
btnOK.onclick = new Function("btnOKClick()");
txtFileName.fImageLoaded = false;
txtFileName.intImageWidth = 0;
txtFileName.intImageHeight = 0;
if (globalDoc.selection.type == htmlSelectionControl) {
if (grngMaster.length == 1) {
elmSelectedImage = grngMaster.item(0);
if (elmSelectedImage.tagName == "IMG") {
txtFileName.fImageLoaded = true;
if (elmSelectedImage.src) {
txtFileName.value = elmSelectedImage.src.replace(/^[^*]*(\*\*\*)/, "$1"); // fix placeholder src values that editor converted to abs paths
txtFileName.intImageHeight = elmSelectedImage.height;
txtFileName.intImageWidth = elmSelectedImage.width;
txtVertical.value = elmSelectedImage.vspace;
txtHorizontal.value = elmSelectedImage.hspace;
txtBorder.value = elmSelectedImage.border;
txtAltText.value = elmSelectedImage.alt;
selAlignment.value = elmSelectedImage.align;
}
}
}
}
txtFileName.value = txtFileName.value || "http://";
txtFileName.focus();
}
function _isValidNumber(txtBox) {
var val = parseInt(txtBox);
if (isNaN(val) || val < 0 || val > 999) { return false; }
return true;
}
function btnOKClick() {
var elmImage;
var intAlignment;
var htmlSelectionControl = "Control";
var globalDoc = window.dialogArguments;
var grngMaster = globalDoc.selection.createRange();
// error checking
if (!txtFileName.value || txtFileName.value == "http://") {
alert("图像连接不能为空");
txtFileName.focus();
return;
}
if (txtHorizontal.value && !_isValidNumber(txtHorizontal.value)) {
alert("水平间距必须介于 0 -- 999.");
txtHorizontal.focus();
return;
}
if (txtBorder.value && !_isValidNumber(txtBorder.value)) {
alert("边宽必须介于 0 -- 999.");
txtBorder.focus();
return;
}
if (txtVertical.value && !_isValidNumber(txtVertical.value)) {
alert("垂直间距必须介于 0 -- 999.");
txtVertical.focus();
return;
}
// delete selected content and replace with image
if (globalDoc.selection.type == htmlSelectionControl && !txtFileName.fImageLoaded) {
grngMaster.execCommand('Delete');
grngMaster = globalDoc.selection.createRange();
}
idstr = "\" id=\"556e697175657e537472696e67"; // new image creation ID
if (!txtFileName.fImageLoaded) {
grngMaster.execCommand("InsertImage", false, idstr);
elmImage = globalDoc.all['556e697175657e537472696e67'];
elmImage.removeAttribute("id");
elmImage.removeAttribute("src");
grngMaster.moveStart("character", -1);
} else {
elmImage = grngMaster.item(0);
if (elmImage.src != txtFileName.value) {
grngMaster.execCommand('Delete');
grngMaster = globalDoc.selection.createRange();
grngMaster.execCommand("InsertImage", false, idstr);
elmImage = globalDoc.all['556e697175657e537472696e67'];
elmImage.removeAttribute("id");
elmImage.removeAttribute("src");
grngMaster.moveStart("character", -1);
txtFileName.fImageLoaded = false;
}
grngMaster = _getTextRange(elmImage);
}
if (txtFileName.fImageLoaded) {
elmImage.style.width = txtFileName.intImageWidth;
elmImage.style.height = txtFileName.intImageHeight;
}
if (txtFileName.value.length > 2040) {
txtFileName.value = txtFileName.value.substring(0,2040);
}
elmImage.src = txtFileName.value;
if (txtHorizontal.value != "") { elmImage.hspace = parseInt(txtHorizontal.value); }
else { elmImage.hspace = 0; }
if (txtVertical.value != "") { elmImage.vspace = parseInt(txtVertical.value); }
else { elmImage.vspace = 0; }
elmImage.alt = txtAltText.value;
if (txtBorder.value != "") { elmImage.border = parseInt(txtBorder.value); }
else { elmImage.border = 0; }
elmImage.align = selAlignment.value;
grngMaster.collapse(false);
grngMaster.select();
window.close();
}
</SCRIPT>
<BODY id=bdy style="BACKGROUND: buttonface; COLOR: windowtext" scroll=no onload=Init()>
...
<BUTTON id=btnOK style="LEFT: 31.36em; WIDTH: 7em; TOP: 1.06em; HEIGHT: 2.2em" tabIndex=40 type=submit>确定</BUTTON><BUTTON id=btnCancel style="LEFT: 31.36em; WIDTH: 7em; TOP: 3.65em; HEIGHT: 2.2em" onclick=window.close(); tabIndex=45 type=reset>取消</FONT></BUTTON>
为什么这个代码没有“document.getElementById('btnOK');”却能正确输出呢？Top
6 楼gu1dai（异域苍穹.百年飞行）回复于 2005-09-12 18:42:09 得分 20
index.html
var arr = showModalDialog("selcolor.html", "", "dialogWidth:18.5em; dialogHeight:17.5em; status:0; location:yes;");
selcolor.html
<SCRIPT language=JavaScript>
window.returnValue = SelColor.value;
window.close();
</SCRIPT>
window.returnValue 会赋予arr
Top
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