Problem with onclick event of a button on asp.net

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Problem with onclick event of a button on asp.net

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#2 by (0 votes)

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I'm making a dynamic table in ASP . This table has buttons in one of the cells.

I have the following code in page_load :

StringBuilder htmlStr = new StringBuilder();
htmlStr.Append(
 "<asp:button onclick='bttn_pdf_Click' class='btn btn-warning btn-xs' ID='Bttn_PDF'>PDF</asp:button>"
);
PlaceHolder1.Controls.Add(new Literal { Text = htmlStr.ToString() });

This is only the part of the buttons that is where I have problems, the idea is that by clicking on it you download a PDF , but the problem is that when you click it shows the following error in the console :

Uncaught ReferenceError: bttn_pdf_Click is not defined
 at HTMLUnknownElement.onclick (VM184 panel.aspx:1)

asp.net

asked by david arellano 11.03.2017 в 18:02

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2 answers

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score 0 · Answer 1

In the code you are showing, you are trying to execute the function on the client side (in the browser) and you will need javascript. In this case:

Normally, the handler of the onclick event is a function and the parentheses are missing. Therefore the code should be onclick="bttn_pdf_Click()

You will have to create in javascript the function bttn_pdf_Click () of the form:

function bttn_pdf_Click(){
  //Código que realice la llamada al servidor para generar el PDF
}

Perhaps it would be better for you if the button were to execute the call directly on the server. In this case you should put onserverclick="bttn_pdf_Click" (and of course you'll have to have declared this function in your asp code). You can see the documentation of events in click on server here: link

score 0 · Answer 2

To add elements dynamically to the interface, it is preferable to create a method that inserts the element in the document:

public void AgregarBoton()
{
    Button nuevo_boton = new Button();
    nuevo_boton.ID = "Bttn_PDF";
    nuevo_boton.Text = "PDF";
    nuevo_boton.Click += new EventHandler(bttn_pdf_Click);
    PlaceHolder1.Controls.Add(nuevo_boton);
}