internetexplorer.application document.getElementByID返回为null/Powershell [英] internetexplorer.application document.getElementByID returns as null / Powershell

问题描述

努力解决以下问题.

请参见HTML的摘录，其中存在ID，但ID始终返回空表达式.不幸的是，我无法在网站上提供更多详细信息.

See the extract of the HTML, the ID is present but it keeps returning a null expression. Unfortunately I cant give any more details on the website... Anything obvious to what I'm doing wrong?

--- HTML的提取----

--- Extract of HTML ----

<input name="ctl00$mainCopy$LoginView$LoginControl$UserName" type="text" id="ctl00_mainCopy_LoginView_LoginControl_UserName" tabindex="1" class="txtBox" onchange="document.getElementById('ctl00_mainCopy_LoginView_LoginControl_PasswordResetLink').disabled
= false;" style="width:150px;" />

-脚本---

$ie = New-Object -com internetexplorer.application
$ie.visible = $true
$ie.navigate("excluded for security")

$ie.document.getElementByID("ctl00_mainCopy_LoginView_LoginControl_UserName").Value= "excluded for security"

----错误----

---- Error ----

You cannot call a method on a null-valued expression.
At line:1 char:1
+ $ie.document.getElementByID("ctl00_mainCopy_LoginView_LoginControl_UserName").Va ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

推荐答案

尝试在$ie.navigate命令之后进行睡眠，例如:

Try putting a sleep after the $ie.navigate command, such as this:

while ($ie.Busy() -and $ie.ReadyState -ne 4){ sleep -Milliseconds 100 }

当您尝试获取元素时，页面似乎仍在加载.

It looks like your page is still loading when you attempt to get an element.

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