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Question

invoke __dopostback inside IE via powershell

Answer 1

+1 A:

2nd attempt

The following code searches for and clicks on all input elements that have a value="Save changes" attribute.

I had to read the attribute's nodeValue property dynamically since it wasn't exposed in the interface.

function getProperty ([System.__ComObject] $obj, [string] $prop)
{
    [System.__ComObject].InvokeMember($prop, [System.Reflection.BindingFlags]::GetProperty, $null, $obj, $null)
}

$ie = new-object -com "InternetExplorer.Application"
$ie.visible = $true
$ie.navigate('e:\scratch\h.html')
$doc = $ie.Document

$inputElts = $doc.getElementsByTagName('input')
foreach ($elt in $inputElts)
{
    $a = $elt.getAttributeNode('value')
    if ($a -and (getProperty $a 'nodeValue') -eq 'Save changes')
    {
        $elt.Click()
    }
}

This is my HTML:

<html>
<head>
<script type="text/javascript">
function alertMsg() {alert("Button was clicked!")}
</script>
</head>
<body>
<form>
<input type="button" onclick="alertMsg()"  value="Save changes" />
</form>
</body>
</html>

dangph 2009-03-04 12:24:12

Well that's the point - both TAG and ID are empty for this button (I've mentioned this in my question). So I can't (or I don't know how) catch button object therefore I'm looking for a way to invoke __dopostback that is executed on button click.

yoosiba 2009-03-04 13:20:31

Okay, I didn't see that. You should provide minimal but *complete* code in order to reduce the chance of misunderstanding. Your input element BTW does have a tag. It is "input". Unfortunately the collection returned by getElementsByTagName("input") doesn't have any useful methods or properties ...

dangph 2009-03-05 02:17:11

... Strangely, most of the DOM objects from IE in PowerShell have incomplete interfaces. That will make the job harder. I may have another look later.

dangph 2009-03-05 02:18:36

Hey. Did that code actually worked for you? First of all should there be getPropety in loop? My PS is throwing errors. If you meant $a.getPropety('nodeValue') this object doesn't contain this method. If it was supposed to be get-member $a 'nodeValue' then this object doesn't contain this property.

yoosiba 2009-03-06 09:00:36

Yes of course it worked for me. getProperty is a function I wrote. It is at the top of the code. I needed it access the nodeValue property, as I explained. You can look up nodeValue here: http://msdn.microsoft.com/en-us/library/aa752509(VS.85).aspx . As I said, nodeValue isn't visible. ...

dangph 2009-03-06 14:59:05

... that's why I had to use InvokeMember to get it. The reason it is invisible is too complicated to explain here."My PS is throwing errors" is not helpful.

dangph 2009-03-06 15:01:18

I dunno why I skipped function at the beginning. Anyway it works great!

yoosiba 2009-03-08 15:46:36

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invoke __dopostback inside IE via powershell

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