VB.NET网络浏览器控制器可以'；t在文本框中设置值

VB.NET网络浏览器控制器 无法在文本框中设置值

<input name="ctl00$ContentPlaceHolder1$txtUsername" type="text" id="ctl00_ContentPlaceHolder1_txtUsername" style="width:95%;" class="TextBoxWatermark" autocomplete="off">

更多信息

var Page_Validators =  new Array(document.getElementById("ctl00_ContentPlaceHolder1_RequiredFieldValidator1"), document.getElementById("ctl00_ContentPlaceHolder1_RequiredFieldValidator2"));

document.getElementById('ctl00_ContentPlaceHolder1_RequiredFieldValidator1').dispose = function() {
Array.remove(Page_Validators, document.getElementById('ctl00_ContentPlaceHolder1_RequiredFieldValidator1'));

Sys.Application.add_init(function() {
$create(AjaxControlToolkit.TextBoxWatermarkBehavior, {"ClientStateFieldID":"ctl00_ContentPlaceHolder1_txtUsernameWatermarkExtender_ClientState","WatermarkCssClass":"TextBoxWatermark","WatermarkText":"ตัวอย่าง mj99u53xxxxxxxx","id":"ctl00_ContentPlaceHolder1_txtUsernameWatermarkExtender"}, null, null, $get("ctl00_ContentPlaceHolder1_txtUsername"));

}

更多信息

var Page_Validators =  new Array(document.getElementById("ctl00_ContentPlaceHolder1_RequiredFieldValidator1"), document.getElementById("ctl00_ContentPlaceHolder1_RequiredFieldValidator2"));

document.getElementById('ctl00_ContentPlaceHolder1_RequiredFieldValidator1').dispose = function() {
Array.remove(Page_Validators, document.getElementById('ctl00_ContentPlaceHolder1_RequiredFieldValidator1'));

Sys.Application.add_init(function() {
$create(AjaxControlToolkit.TextBoxWatermarkBehavior, {"ClientStateFieldID":"ctl00_ContentPlaceHolder1_txtUsernameWatermarkExtender_ClientState","WatermarkCssClass":"TextBoxWatermark","WatermarkText":"ตัวอย่าง mj99u53xxxxxxxx","id":"ctl00_ContentPlaceHolder1_txtUsernameWatermarkExtender"}, null, null, $get("ctl00_ContentPlaceHolder1_txtUsername"));

}))

还有更多

document.getElementById('ctl00_ContentPlaceHolder1_RequiredFieldValidator2').dispose = function() {
Array.remove(Page_Validators, document.getElementById('ctl00_ContentPlaceHolder1_RequiredFieldValidator2'));

}

我试过这个密码

webBrowser1.Document.All.GetElementsById("ctl00_ContentPlaceHolder1_txtUsername").SetAttribute("Value", "xxxxx");

它无法工作

请尝试：

webBrowser1.Document.GetElementsById("ctl00_ContentPlaceHolder1_txtUsername").SetAttribute("Value", "xxxxx");

---

没有

All

属性。

我尝试了您的代码，但是NullRefReferenceException[对象引用未设置为对象的实例]occur@sandra您确定

webBrowser.Document

不是

Nothing

？如果没有，你的网页没有加载，你需要发布更多的代码来解决这个问题。我在我的网站上尝试了这个代码，但我在另一个网站上尝试了这个代码，我不工作。为什么？@sandra可能第二个网站需要更多的时间加载，或者代理正在拦截和更改网站，因为你没有cookies。如果没有更多信息，不可能知道第二个网站是由.aspx创建的，它可以保护吗？更多代码>>>