ASP.NET return parameter problem

duolabmeng · Post time: 2020-11-10 09:00:01

VS wants to send parameters back to the foreground in the background.
With the following sentences, a warning box can pop up at the front desk.
      Response.Write("<script language=javascript>");
      Response.Write("alert('1111');");
      Response.Write("</script>");
But I add one sentence.
      Response.Write("<script language=javascript>");
      Response.Write("document.getElementById('Textl').value='99999';");
      Response.Write("alert('1111');");
      Response.Write("</script>");
There is no response from the front desk.
Experts please advise.
My purpose is to execute some statements in the background, and send the results back to the foreground control. I could add SERVER to the control. I feel that the above statement should be more convenient to use, thank you.

xing_532 · Post time: 2020-11-10 09:15:01

document.getElementById('Textl').value='99999'
There is an error in this sentence, text1 is not found, of course the value is wrong

苹果小刀 · Post time: 2020-11-10 09:30:01

Use RegisterClientScriptBlock()
as follows:
<html>
  <head>
<script language="C#" runat="server">

   public void Page_Load(Object sender, EventArgs e)
   {

      if (!this.IsClientScriptBlockRegistered("clientScript"))
      {
      // Form the script that is to be registered at client side.
      String scriptString = "<script language=JavaScript> function DoClick() {";
      scriptString += "myForm.show.value='Welcome to Microsoft .NET'}<";
      scriptString += "/";
      scriptString += "script>";
      this.RegisterClientScriptBlock("clientScript", scriptString);
      }
   }

   </script>
  </head>
  <body topmargin="20" leftmargin="10">
<form id="myForm" runat="server">
<input type="text" id="show" style="width=200"> <input type="button" value="ClickMe" onclick="DoClick()">
</form>
  </body>
</html>

xing_532 · Post time: 2020-11-10 11:00:01

You can not use this method, use <%=Background public variable%> to assign a value to Text1
<input id="Text1" type="text" value="<%=Background public variables%>" />

iceice930 · Post time: 2020-11-10 12:00:01

The problem is obvious. Any content sent by Response.Write is at the top of the html page, which is before the <html> tag. At this time, all other elements in your page have not been created yet, document.getElementById('Textl') You can't get anything at all, you should use the RegisterStartupScript method to register this script.

=======================
www.iceice930.com

风随心动归来 · Post time: 2020-11-10 12:15:01

Try this sentence document.All('Textl').InnerText
Text1 is Div
Or document.All('Textl').Value
Text1 is the input text box

xiaoyao11 · Post time: 2020-11-10 12:30:01

Support upstairs!!!

sulfuresser · Post time: 2020-11-10 13:00:01

iceice930

The problem is obvious. Any content sent by Response.Write is at the top of the html page, which is before the <html> tag. At this time, all other elements in your page have not been created yet, document.getElementById('Textl') You can't get anything at all, you should use the RegisterStartupScript method to register this script.

=======================
www.iceice930.com


agree!
then:

If Text1 is a server-side textbox, try this:

Response.Write("<script language=javascript>");
      Response.Write("document.getElementById('<%=Textl.Client%>').innerText='99999';");
      Response.Write("alert('1111');");
      Response.Write("</script>");

duolabmeng · Post time: 2020-11-10 13:30:01

According to the method of RegisterStartupScript, there is a time problem, and it seems that this problem cannot be solved.
The registered script is executed together with the button event. I now want to execute some statements in the background before executing the script.
If executed together with the button event, you can also use this method
BUTTON.Attributes.Add

What I want to do now is: upload a picture, save the picture in the background, and then return the address of the picture to the foreground control, with a time interval in between.

In order to solve this time interval, the JAVASCRIPT event cannot be triggered by ASP.NET. I don't know if ASP.NET has any way to actively send parameters to the foreground control.

Thank you for your advice.

sd1471123 · Post time: 2020-11-10 14:00:01

It is estimated that text1 was not found

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