ASP.NET文本框-更新标签onkeyup

Question

<script type="text/javascript">
    function RefreshUpdatePanel(id) {
        __doPostBack(id, '');
    };
</script>

<div style="width:800px; margin:0 auto;">
        <asp:Panel ID="testpanel" runat="server"></asp:Panel>
        <asp:ScriptManager runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="update" runat="server">
            <ContentTemplate>
                <asp:Panel ID="pnlProdKits" runat="server"></asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>

    </div>

TextBox txtQuantity = new TextBox() { Width = 30, Text = "0", MaxLength = 4, ID = prod.Number };
txtQuantity.Style["text-align"] = "right";
txtQuantity.TextChanged += delegate(object o, EventArgs e) { lblPriceTotal.Text = "new text!"; };
                txtQuantity.Attributes.Add("onkeyup", string.Format("RefreshUpdatePanel(ContentPlaceHolder1_{0});", txtQuantity.ClientID));

AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
trigger.ControlID = txtQuantity.ClientID;
update.Triggers.Add(trigger);

testpanel.Controls.Add(txtQuantity);

标签被添加到更新面板内的面板中：

pnlProdKits.Controls.Add(priceTotal);

Answer 1

正如所讨论的，

您可以尝试下面的脚本，

<script type="text/javascript">

function RefreshUpdatePanel(){
//Find all textboxes which you want to get the values by their `ClientID` property. Like,
var a = $('#' + '<%= txtQuantity.ClientID %>').val();
var b = $('#' + '<%= txtQuantity2.ClientID %>').val();

//Since the value will be in string, you need to convert it to numeric for mathematical operations

var sum = parseFloat(a) + parseFloat(b);

//Then find the label and assign the result

$('#'+'<%= Label1.ClientID %>').val(sum.toFixed(2));

}

</script>

添加onkeyup/onkeydown的其余代码将是相同的。