In Asp.net c# on button click event (server side)

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In Asp.net c# on button click event(server side) I need to clear all textbox on the form using javascript method on add button click and then I need to set value to textbox by serverside as given bellow.
But it is not working if I comment registering script line then it working but I also need to clear the textboxes.

C#

protected void btnAdd_Click(object sender, EventArgs e)
 {  
    ScriptManager.RegisterStartupScript(this, typeof(string), "key1","ClearControls();",                    true);
    TxtChallanNo.Text = "New";
  }

Using above code after add button click event textbox remain empty, I expect to set it to “New”
Thanks in advance.

Posted 2-Sep-15 18:54pm

PatilAnil

Updated 2-Sep-15 19:02pm

Schatak

v2

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Comments

Schatak 3-Sep-15 1:07am

You means after calling ClearControls() function from Javascript, you need to set txtChallanNo text box's value to "New"?

PatilAnil 3-Sep-15 1:10am

yes exactly

Sergey Alexandrovich Kryukov 3-Sep-15 1:14am

What prevents you from writing the value you want?
—SA

Schatak 3-Sep-15 1:17am

then what is the issue? are you not getting the value?

PatilAnil 3-Sep-15 2:26am

after calling javascript function clearcontrols() when i set values to textbox on that form by server side
ie.

btnAdd_click()
{
clearcontrols();//----Javascript Method called using registerstartupscript
TxtID.Text=GetNextID();//----server side method to get next id(max +1) // I have set "New" in my example
TxtDate.Text= "03-Sept-2015";//Simply assinged some text
}

i m not able to see the result of last two line why ? If i comment first line then it works properly but i also need to clear controls only by javascript.

F-ES Sitecore 3-Sep-15 4:31am

Clear the textboxes via your server code rather than using javascript.

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amitbhilare · Answer 1 · 2015-09-02T20:33:00

You have to assign TxtChallanNo.Text = “New”; into your javasScript function i.e. ClearControls(); your executing code wrongly because when you call the following line

ScriptManager.RegisterStartupScript(this, typeof(string), "key1","ClearControls();", true);

it does not execute it that time itself when your button click execution completed that time it execute your javascript code. For more information about this please insert breakpoint on button click as well as javascript function then check how your code get executed.

Schatak · Answer 2 · 2015-09-02T20:52:00

Solution 2

There are many ways to call JS function in code behind, one of them is:

C#

protected void MyButton_Click(object sender, EventArgs e)
    {
        Page.ClientScript.RegisterStartupScript(this.GetType(), "myScript",           "SomeJSFunction();", true);
        textID.Text =SomeFunction();
        textName.Text = "SomeRandomeText";
    }
    public String SomeFunction()
    {
        count += 1;
        return count.ToString();
    }

Try this , it will work for you.
Thanks

Posted 2-Sep-15 20:52pm

Schatak

Updated 2-Sep-15 20:53pm

v2

Comments

F-ES Sitecore 3-Sep-15 4:33am

There are no ways to call js in code-behind. Such statements add to people's confusion about the client\server model. When doing asp.net there are basic concepts that are vital to understand such as the server only generating html which is sent to the browser to be executed. When people think they are calling js from their server code it makes them attempt to implement solutions that will never work. Such as the one being tried by the OP.

Schatak 3-Sep-15 4:37am

i do understand the risk of it. but if there are such functions by asp.net which allow us to call as per our need, then its not bad to use it.
Yes it is advisable not to use such approaches in avoidable circumstances.

In Asp.net c# on button click event (server side)

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In Asp.net c# on button click event (server side)

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