单击按钮时JavaScript函数清除标签值 [英] JavaScript function clear label value at button click

问题描述

我为总和计算编写 JavaScript 函数。它工作，但当我点击添加按钮插入数据库时​​，它清除标签值，我无法获得标签值到代码页我的 JavaScript 代码是

I write a JavaScript function for sum calculation. it works but when I click add button to insert in to database it clear label value and i can't get label value to code page my JavaScript code is

<script type="text/javascript">
function sum()
{
    var sales_cost = document.getElementById("<%=txtsales_cost.ClientID%>").value;
    var vat = document.getElementById("<%=ddvat.ClientID%>").value;
    document.getElementById("<%=txtnetamt.ClientID%>").innerHTML=parseInt(sales_cost)+parseInt(sales_cost)*vat/100; 
}
</script>

我在点击按钮时调用它

I call it at button click

<asp:Button ID="Button1" runat="server" CssClass="button" Text="Add" Width="79px" onclick="Button1_Click1" />

推荐答案

您好，

问题不是很清楚，但了解您可以尝试这些来解决您的问题



选项1：

Hello,
Question is not very clear but understand you can try these to solve your issue

Option1:

<asp:button id="Button1" runat="server" cssclass="button" text="Add" xmlns:asp="#unknown">
                Width="79px" onclick="Sum()" /></asp:button>

option2：

option2:

<asp:button id="Button1" runat="server" cssclass="button" text="Add" xmlns:asp="#unknown">
                Width="79px" onclick="javascript:Sum()" />
</asp:button>

选项3：如果你想要服务器端和客户端电话

option3:If you want server side and client side call

<asp:button id="Button1" runat="server" cssclass="button" text="Add" xmlns:asp="#unknown">
                Width="79px" onclick="Button1_Click1" onclientclick="return Sum()" />
</asp:button>

更改脚本：

Change your Script:

function sum()
{
    var sales_cost=document.getElementById("<%=txtsales_cost.ClientID%>").value;
    var vat=document.getElementById("<%=ddvat.ClientID%>").value;
                    document.getElementById("<%=txtnetamt.ClientID%>").innerHTML=parseInt(sales_cost)+parseInt(sales_cost)*vat/100;
return false;
}

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