1.asp.net call JS
Response. Write ("<script language = JavaScript> ");
Response. Write ("alert ('Welcome to the Summit ');");
Response. Write ("location. href = 'login. aspx ';");
Response. Write ("</SCRIPT> ");
In this case, you can call all JS script functions on the page.
2. How does a JS script access the server control value?
There is a Textbox Control on the interface, whose ID is name. The following script can be used in JS to obtain the name value.
VaR myvalue = Document. All ('name'). value;
3. How to obtain the value of a variable in JS from a server control?
The method is to place a hidden control htmlinputhidden on the interface and set it to run as a server control, so that the control value can be accessed in JS scripts and ASP. NET code.
Assign a value to the server control in JS:
VaR bt = Document. All ('name'). value;
Bt. value = 'name ';
Use name. Value to access ASP. NET.
4. Call functions between the foreground and the background
<Head runat = "server">
<Title> untitled page </title>
<SCRIPT type = "text/JavaScript">
Function callserver (ARG ){
VaR OTB = Document. getelementbyid ('<% = editvalue. clientid %> ');
// Arg is the variable passed to the server
Arg = OTB. value;
<% = Clientscript. getcallbackeventreference (this, "Arg", "eseserverresult", null, true) %>
}
Function exploreserverresult (result ){
// Add the logic for processing the server's returned results here. The result variable is the result returned by the server.
Alert (result );
}
</SCRIPT>
... // Some code is omitted here
<Asp: textbox id = "editvalue" runat = "server"/>
<Asp: button id = "btnsubmit" runat = "server" text = "submit data" onclientclick = "callserver (); Return false;"/>
</Head>
CS files
C # code
// The page class inherits the icallbackeventhandler interface and implements two methods.
Public partial class _ default: system. Web. UI. Page, icallbackeventhandler
{
Private string m_strresult = "";
# Region icallbackeventhandler members
Public String getcallbackresult ()
{
// Return the server processing result to the receiveserverresult Method
Return m_strresult;
}
Public void raisecallbackevent (string eventargument)
{
// Eventargument is a variable sent from the client, corresponding to the ARG variable
// Add the server processing logic here...
M_strresult = eventargument;
}
# Endregion
}
5. Execute functions in C # code in JavaScript Functions:
Method 1: 1. Create a button to write the called or processed content to button_click in the background;
2. Write a JS function on the front-end with the content document. getelementbyid ("btn1"). Click ();
3. Call JS functions on the frontend or backend to stimulate the click event, which is equivalent to accessing the C # function in the background;
Method 2: 1. function declaration is public
Background code (change public to protected)
Public String SS ()
{
Return ("");
}
2. You can call <% = fucntion () %> in HTML.
Foreground script
<Script language = JavaScript>
VaR A = "<% = SS () %> ";
Alert ();
</SCRIPT>
Method 3: 1. <script language = "JavaScript">
<! --
Function _ dopostback (eventtarget, eventargument)
{
VaR theform = Document. form1; // indicates the form of runat = server.
Theform. _ eventtarget. value = eventtarget;
Thefrom. _ eventargument. value = eventargument;
Theform. Submit ();
}
-->
</SCRIPT>
<Input id = "button1" type = "button" name = "button1" value = "button" onclick = "javascript dopostback ('button1','') ">
Method 4: <script language = "JavaScript">
Function submitkeyclick ()
{
If (event. keycode = 13)
{
Event. cancelbubble = true;
Event. returnvalue = false;
Document. All. funname. value = "Name of the function you want to call ";
Document. Form [0]. Submit ();
}
}
</SCRIPT>
<Input onkeypress = "submitkeyclick ()" id = "AAA" type = "text">
<Input type = "hidden" name = "funname"> <〈! -- Used to store the function you want to call --> --〉
In. CS, there are:
Public page_onload ()
{
If (! Page. ispost ())
{
String strfunname = request. Form ["funname"]! = NULL? Request. Form ["funname"]: "";
// Determine which function to call based on the value returned
Switch (strfunname)
{
Case "Enter ()":
Enter (); // call this function
Break;
Case "Others ":
// Call other functions
Break;
Default:
// Call the default Function
Break;
}
}
}
Public void enter ()
{
//...... For example, calculating a value
}
6. How to access the C # variable in JavaScript?
Method 1: 1. Access <input id = "XX" type = "hidden" runat = "server">
Method 2: 1. For example, Public String N is defined in the background; the format of the variable referenced in front-end JS is '<% = n %>' or "+ <% = n %> +"
Method 3: 1. You can register a script on the page after assigning values to variables on the server.
"<Script language = 'javascript '> var temp =" + TMP + "</SCRIPT>"
TMP is the background variable, and then you can directly access temp in JS to obtain the value.
7. How to access JavaScript Functions in C?
C # execute JavaScript Functions in the Code:
Method 1: 1. Page. registerstartupscript ("ggg", "<SCRIPT> setvisible (1); </SCRIPT> ");
Method 2: Use the literal class and
Private void button2_click (Object sender, system. eventargs E)
{
String STR;
STR = "<script language = 'javascript '> ";
STR + = "selectrange ()";
STR + = "</SCRIPT> ";
// Literal1.visible = true;
Literal1.text = STR;
}
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
