c# - ASP.NET 3.5 onClientClick 返回 false 不起作用

Question

我有以下代码：

    <script language="javascript" type="text/javascript">
    function readCookie(name)
    {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++)
        {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    }

    function imprimeTesis()
    {
        valor = readCookie("Marcadas");

        if (valor == null) return true;
        var resultado = true;
        if (valor == "1")
        {
           resultado = confirm("¿Quiere imprimir todas las tesis marcadas? Si contesta no imprimirá sólo la actual ");
        }
        return resultado;
    }
</script>
<asp:Table ID="Table1" runat="server" Height="46px" Width="696px">
    <asp:TableRow runat="server">
    <asp:TableCell ID="TableCell1" runat="server">
        <asp:ImageButton runat="server" ID="BtnGuardar" style="cursor: hand"
                     onmouseover="this.src = '../images/GUARDAR2.png';"
                     onmouseout = "this.src = '../images/GUARDAR1.png';"
                     OnClick="BtnGuardar_Click"  ImageUrl="../images/GUARDAR1.png"/>
        </asp:TableCell>
        <asp:TableCell ID="TableCell2" runat="server">
        <asp:ImageButton runat="server" ID="BtnImprimir" style="cursor: hand"
                     onmouseover="this.src = '../images/IMPRIMIR2.png';"
                     onmouseout = "this.src = '../images/IMPRIMIR1.png';"
                     OnClientClick = "imprimeTesis()"
                     OnClick="BtnImprimir_Click"  ImageUrl="../images/IMPRIMIR1.png"/>
        </asp:TableCell>

我的 BtnImprimir 按钮上的 OnClientClick 事件被触发 OK，如果我有 cookie，则会显示确认对话框，但我在确认对话框上响应 YES 或 No 都没有关系...... onClik 总是被执行。

Answer 1

使用OnClientClick = "return imprimeTesis();". 您需要将函数的结果返回给控件。

<asp:ImageButton runat="server" ID="BtnImprimir" style="cursor: hand"
                 onmouseover="this.src = '../images/IMPRIMIR2.png';"
                 onmouseout = "this.src = '../images/IMPRIMIR1.png';"
                 OnClientClick = "return imprimeTesis();"
                 OnClick="BtnImprimir_Click"  ImageUrl="../images/IMPRIMIR1.png"/>

Answer 2

您需要添加一个返回语句：

OnClientClick = "return imprimeTesis();" 

Answer 3

更新：在 VS2017 中，如果 UseSubmitBehavior 为 False C# 将自己的函数调用添加到 onclick 事件

onclick="doPostBack('ctl00$ContentPlaceHolder1$AddBtn','')" 

所以我将 return function() 更改为 if(!function()) return;

onclick="if(!ValidWorkOrder()) return;__doPostBack('ctl00$ContentPlaceHolder1$AddBtn','')"

这解决了我的问题。