vb.net 教程 12-3 HtmlElement类 6- VB

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经过上面两节的学习，我们已经可以做到填充数据和提交表单了。

作为一个自动填表软件，自然需要同时完成以上两方面的功能。

简单的是我们可以直接将两段代码合并在一起：

Private Sub btnOneKey1_Click(sender As Object, e As EventArgs) Handles btnOneKey1.Click
Dim strName As String = "张三"
Dim strAge As String = "12"

Dim htmlAlls As HtmlElementCollection
htmlAlls = wbMain.Document.All

For Each htmlSingle As HtmlElement In htmlAlls
Select Case htmlSingle.GetAttribute("name")
Case "studentname"
htmlSingle.SetAttribute("value", strName)
Case "studentage"
htmlSingle.SetAttribute("value", strAge)
Case Else
'不处理
End Select
Next

For Each htmlSingle As HtmlElement In htmlAlls
Select Case htmlSingle.GetAttribute("name")
Case "submit1"
htmlSingle.RaiseEvent("onclick")
Case Else
'不处理
End Select
Next

End Sub
当然代码会遍历了网页内的所有元素，但实际上我们只需要Input标签的数据。

那么可以将

htmlAlls = wbMain.Document.All

修改为：

htmlAlls = wbMain.Document.GetElementsByTagName("Input")

完整代码：

Private Sub btnOneKey2_Click(sender As Object, e As EventArgs) Handles btnOneKey2.Click
Dim strName As String = "李四"
Dim strAge As String = "https://files.jxasp.com/image/21"
Dim htmlAlls As HtmlElementCollection

htmlAlls = wbMain.Document.GetElementsByTagName("Input")
For Each htmlSingle As HtmlElement In htmlAlls
Select Case htmlSingle.GetAttribute("name")
Case "studentname"
htmlSingle.SetAttribute("value", strName)
Case "studentage"
htmlSingle.SetAttribute("value", strAge)
Case Else
'不处理
End Select
Next

For Each htmlSingle As HtmlElement In htmlAlls
Select Case htmlSingle.GetAttribute("name")
Case "submit1"
htmlSingle.RaiseEvent("onclick")
Case Else
'不处理
End Select
Next
End Sub
还是需要两次枚举，因为我们不能在数据没有填充完之前就提交。

那么，还可以采用一种指定对象的方法：HtmlDocument.GetElementById()，参数为网页元素的ID，通常这个是不重复的。

具体代码如下：

Private Sub btnOneKey3_Click(sender As Object, e As EventArgs) Handles btnOneKey3.Click
Dim strName As String = "王五"
Dim strAge As String = "7"

Dim htmlName As HtmlElement
htmlName = wbMain.Document.GetElementById("studentname")
htmlName.SetAttribute("value", strName)

Dim htmlAge As HtmlElement
htmlAge = wbMain.Document.GetElementById("studentage")
htmlAge.SetAttribute("value", strAge)

Dim htmlSubmit As HtmlElement
htmlSubmit = wbMain.Document.GetElementById("submit1")
htmlSubmit.RaiseEvent("onclick")

End Sub

运行效果如下：