我有一些使用 iFrame 的旧代码。代码在屏幕上显示正常，但是，当我尝试通过 javascript 操作某些元素时，它找不到它们。
例如它说 Table 是 NULL(但是，我正在屏幕上查看它)。
当 HTML 驻留在 iFrame 中时，我如何操作它？
更新: 我试过这段 javascript 代码:
alert(window.frames['iframe_layer1'].document.forms['pagectrls'].elements['ptObj_listbox2'].innerHTML);
我从 FireBug 收到以下错误: window.frames.iframe_layer1.document.forms.pagectrls.elements.ptObj_listbox2 未定义
这是 iFrame 的代码输出:
<div id="popcont_1" class="popupContainer" style="width: 740px; height: 520px; left: 507px; top: 0px; display: block; z-index: 97;">
<iframe id="iframe_layer1" style="width: 738px; display: block;" class="popupFrame" name="iframe_layer1" onload="top.iframeOnload();" src="default.asp?bn=0.7346613&wpo=1&p=1" frameborder="0" scrolling="no">
<html>
<div class="TabPanel" id="paneltab3" name="paneltab3" style="display: inline;"> <div class="colvis">55</div><div style="border: 1px solid rgb(136, 141, 119); position: absolute; width: 198px; z-index: 90; left: 147px; top: 8px; overflow: hidden;" id="ptObj_listbox1main"><div style="z-index: 95; background: none repeat scroll 0% 0% white; overflow-y: auto; overflow-x: hidden; width: 198px; height: 112px; position: relative;" id="ptObj_listbox1div"><table cellspacing="0" cellpadding="0" border="0" style="margin-top: 0px; width: 199px;" id="ptObj_listbox1"><tbody><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row0" lstindx="0" class="LUGridRowHighlight"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Personnel Management</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row1" lstindx="1" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Safety Management</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row2" lstindx="2" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">COBRA Administration</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row3" lstindx="3" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Training Course</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row4" lstindx="4" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Training Administration</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row5" lstindx="5" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Job Profile</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row6" lstindx="6" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Position Control</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row7" lstindx="7" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Requisition Tracking</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row8" lstindx="8" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Applicant Management</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row9" lstindx="9" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Contact Management</a></td></tr><tr ondblclick="lbRowDblClick(this,1, "");" onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row10" lstindx="10" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Survey</a></td></tr></tbody></table><table style="display: none;" id="ptObj_listbox1archetype"><tbody><tr onclick="lbRowClick(this,"ptObj_listbox1", "");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=1" id="ptObj_listbox1Row" lstindx="0" class="LUGridRow"><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)"></a></td></tr></tbody></table></div></div><!-- Listbox End -->
<div style="border: 1px solid rgb(136, 141, 119); position: absolute; width: 198px; z-index: 90; left: 147px; top: 127px; overflow: hidden;" id="ptObj_listbox2main"><div style="z-index: 95; background: none repeat scroll 0% 0% white; overflow-y: auto; overflow-x: hidden; width: 198px; height: 240px; position: relative;" id="ptObj_listbox2div"><table cellspacing="0" cellpadding="0" border="0" style="margin-top: 0px; width: 199px;" id="ptObj_listbox2"><tbody><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row0" lstindx="0" class="LUGridRowHighlight"><td ptcheck="true" style="width: 19px;" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Personal</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-1</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row1" lstindx="1" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Status</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-2</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row2" lstindx="2" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Compensation</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-3</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row3" lstindx="3" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Position History</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-4</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row4" lstindx="4" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Performance Appraisals</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-5</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row5" lstindx="5" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Benefits</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-6</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row6" lstindx="6" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Background</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-7</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row7" lstindx="7" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Medical/Wellness</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-8</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row8" lstindx="8" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Training/Competency</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-9</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row9" lstindx="9" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Attendance</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-10</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row10" lstindx="10" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Timesheet Information</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-11</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row11" lstindx="11" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">Payroll Information</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-12</a></td></tr><tr ondblclick="lbRowDblClick(this,2, "0");" onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row12" lstindx="12" class="LUGridRow"><td ptcheck="true" class="LUGridCell"><div class="lbCheckTrue"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)">User Fields</a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)">EMP-13</a></td></tr></tbody></table><table style="display: none;" id="ptObj_listbox2archetype"><tbody><tr onclick="lbRowClick(this,"ptObj_listbox2", "0");" pturl="ajxcmd.asp?datactrl=&xCmd=LSTRCLICK&xLstNDX=2" id="ptObj_listbox2Row" lstindx="0" class="LUGridRow"><td ptcheck="false" style="width: 19px;" class="LUGridCell"><div class="lbCheckFalse"></div></td><td class="LUGridCell"><a class="dummyLinks" href="javascript:void(0)"></a></td><td class="ColVis"><a class="dummyLinks" href="javascript:void(0)"></a></td></tr></tbody></table></div></div><!-- Listbox End -->
<input type="button" onclick="btnClick(this, 'ListRowUp');" style="top: 127px; left: 360px; width: 60px; height: 24px;" value="Up" tabindex="-1" id="ptObj_bbutton1" class="ptbutton" pttype="b" ptlayndx="61" ptdisp="false" ptpopup=""><div class="colvis">62</div><input type="button" onclick="btnClick(this, 'ListRowDown');" style="top: 153px; left: 360px; width: 60px; height: 24px;" value="Down" tabindex="-1" id="ptObj_bbutton2" class="ptbutton" pttype="b" ptlayndx="62" ptdisp="false" ptpopup=""><div class="colvis">63</div></div>
</body></html>
</iframe>
</div>
最佳答案
所有现代浏览器都允许您调试代码和交互执行 JavaScript。这在像您这样的情况下很有用-抛出异常时停止并开始减少您的语句直到它起作用。
很可能在您的情况下缺少某些元素(即我在您的示例 HTML 中没有看到 FORM 标记)。
尝试以交互方式调试和执行语句，直到找到失败的语句:
window.frames['iframe_layer1']
window.frames['iframe_layer1'].document
window.frames['iframe_layer1'].document.forms['pagectrls']
window.frames['iframe_layer1'].document.forms['pagectrls'].innerHTML
关于javascript - IFrame 中的 HTML 不允许 DOM 交互，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5435750/