It is a very common issue to handle automatic postbacks to controls. Here I am going to explain how we can handle autopostback of a button click using Javascript Event.
Suppose you have a button :
<asp:button runat="server" onclick="btn_click"
Id ="btnAutoPostBack" />
Now you want to occationally cancel the click event so that the page will only be posted back when you want. So add this code:
<asp:button runat="server" onclick="btn_click"
Id ="btnAutoPostBack" onclientclick="javacript:return isValid();"/>
or Add the attribute onclick to the button in Page_Load
:
btn.Attributes.Add("onclick", "javascript:return isValid()");
Now let us look what the function look like:
function isValid(){
return confirm("Are you sure you want to postback?");
}
Thus when you click on Ok, the btn_click
will get generated as the page is posted back, otherwise the page will remain intact.
here Javascript:return false;
means we are disallowing the postback event of the button.
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