How to restrict append string in Java script

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Hello Frinds,

I am using javascript. I call javascript function on del OnclintClick event. when I clicked on code behind on del button. it's give me Confirm box msg when I click on ok it's return YES. but second time Click on Ok its. append string like Ex "Yes,Yes"
how could I restrict to append it.
My Code Is -
Javascript code ----

C#

function Confirm() {
            var confirm_value
            confirm_value = document.createElement("INPUT");
            confirm_value.type = "hidden";
            confirm_value.name = "confirm_value";

            if (confirm("Do you want to delete supplier ?")) {
                confirm_value.value = "Yes";
            } else {
                confirm_value.value = "No";
            }

            document.forms[0].appendChild(confirm_value);
        }

C# Code----------

C#

string confirmValue = string.Empty;
                    confirmValue = Request.Form["confirm_value"];
                    if (confirmValue == "Yes")
                    {
                        string str = string.Empty;
                        int rowIndex = Convert.ToInt32(e.CommandArgument);
                        ViewState["Index"] = rowIndex;
                        int Id = Convert.ToInt32(grdTenDistSupp.Rows[rowIndex].Cells[0].Text);
                        str = ClsResponse.DeleteTenderDistributionById(Id);
                        if (str == "SUCCESS")
                        {
                            ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('Supplier deleted successfully ');", true);
                            TenderDistributionSuppliersByTCId();

                        }
                    }

Thanks
Rameshwar

Posted 30-Sep-15 18:29pm

rameshvar

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Palash Mondal_ · Answer 1 · 2015-09-30T19:05:00

The issue here is you are appending the same element over and over again on multiple clicks. You can remove the previously added element before adding a new one like

JavaScript

function Confirm() {

    var form = document.forms[0];

    // Remove the previous element added
    var oldInput = document.getElementById('myInput');
    if (oldInput !== null) form.removeChild(oldInput);

    // Add a new element
    var confirm_value = document.createElement("INPUT");
    confirm_value.setAttribute('id', 'myInput');
    confirm_value.type = "hidden";
    confirm_value.name = "confirm_value";

    if (confirm("Do you want to delete supplier ?")) {
        confirm_value.value = "Yes";
    } else {
        confirm_value.value = "No";
    }

    form.appendChild(confirm_value);
}

Krunal Rohit · Answer 2 · 2015-09-30T18:46:00

Clear the Yes/No value before assigning it.

JavaScript

function Confirm() {
    var confirm_value;
    
    confirm_value = document.createElement("INPUT");
    confirm_value.type = "hidden";
    confirm_value.name = "confirm_value";
    confirm_value.value = "";
    confirm_value.value = "";
    if (confirm("Do you want to delete supplier ?")) {
        confirm_value.value = "Yes";
    } else {
        confirm_value.value = "No";
    }
    
    document.forms[0].appendChild(confirm_value);
}

-KR

How to restrict append string in Java script

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