JS call background, background call foreground and other methods to summarize _javascript skills

JS call backstage, background call foreground and other methods summary

1. Execute functions in C # code in JavaScript functions:

Method One: 1, first establishes a button, in the backstage will call or the processing content writes in the button1_click;

Copy Code code as follows:

protected void Button1_Click (object sender, EventArgs e)
{
This. TextBox1.Text = "Voodooer";
}

2, in the foreground can be called:

Copy Code code as follows:

<input type= "button" value= "Access to C # 's method" Onclick= ' document.getElementById ("Button1"). Click (); '/>

Method Two: 1, function declared as public or protected

Copy Code code as follows:

public string SS ()
{
Return ("Voodooer");
}

2, the front call method

Copy Code code as follows:

<script language=javascript>
var a = "<%=ss ()%>";
alert (a);
</script>

Method Three: 1, <script language= "JavaScript" >

Copy Code code as follows:

<!--
function __doPostBack (Eventtarget, eventargument)
{
var theform = document. Form1; Refers to the form of runat=server
Theform.__eventtarget.value = Eventtarget;
Thefrom.__eventargument.value = eventargument;
Theform.submit ();
}
-->
</script>
<input type= "button" value= "Buttons" >

Method Four:

Copy Code code as follows:

<script language= "JavaScript" >
function Submitkeyclick ()
{
if (Event.keycode = 13)
{
Event.cancelbubble = true;
Event.returnvalue = false;
Document.all.funname.value= "The function name you want to call";
Document.form[0].submit ();
}
}
</script>
<input type= "Text" >
<input type= "hidden" >〈! --To store the function you want to call--〉

In the. cs there are:

Copy Code code as follows:

Public Page_onload ()
{
if (! Page.ispost ())
{
String strfunname=request.form["Funname"]!=null? request.form["Funname"]: "";
Decide which function to call based on the returned value
Switch (strfunname)
{
Case "Enter ()":
Enter (); Call this function
Break
Case "Other":
Calling other functions
Break
Default
Calling the default function
Break
}
}
}
public void Enter ()
{
...... Like calculating a value
}

2. How do I access C # variables in JavaScript?

The answer is as follows:

Method One: 1, through the page hidden domain access <input type= "hidden" runat= "Server" >

Method Two: 1, such as the background definition of public STRING N; foreground JS reference to the variable in the format of ' <%=n%> ' or ' + <%=n%>+ '

Method Three: 1, or you can register a script on the page after the server-side variable is assigned

"<script language= ' JavaScript ' >var temp=" + tmp + "</script>"

TMP is a background variable, and then you can directly access the temp to get the value in JS.

3. How do I access the existing variables of JavaScript in C #?

The answer is as follows:

Method One: 1, the foreground uses the static text control to hide the domain, writes the JS variable value to it;

2, the backstage uses request["the ID" to obtain the value;

Method Two: Can use Cookie or session

4. How do I access JavaScript functions in C #?

The answer is as follows:

Execute JavaScript functions in C # code:

Method One: 1, page.registerstartupscript ("GGG", "<script>setvisible (1); </script>");

Method Two: Use the literal class, and then

Copy Code code as follows:

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;
}