无法在Javascript中访问Codebehind值 [英] Codebehind value not accessed in Javascript

问题描述

在javascript中具有以下功能:

window.onunload = unloadPage;

Have a function in javascript as :

window.onunload = unloadPage;

function unloadPage()
        {
        var abc= <%=Price %>
        alert(abc)

}

Price是代码背后的变量，其值在Datagrid OnPageIndexChanged事件中设置.

VB.NET代码是:
公开价格为字符串

}

Price is the variable in codebehind and its value is set in Datagrid OnPageIndexChanged event.

VB.NET Code is:
Public Price As String

Protected Sub dgttumfileview_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) Handles dgttumfileview.PageIndexChanged
                   Price = "True"
               End Sub

但是我在警报中获得未定义"的价格.如何获得在代码隐藏中设置的"True"值.

But I''m getting value of Price as ''undefind'' in alert. How can I get value as "True" which is set in codebehind.

推荐答案

有时，在后面的代码中设置的值不会出现在javascript中.因此，我建议使用隐藏字段而不是变量.

在源中添加一个隐藏字段，并在后面的代码中设置值并从javascript函数中读取.

Hi,

some times the values set in code behind will not appear in javascript. so, i suggest to use hidden field instead of variable.

add one hidden field to the source and set the value in code behind and read from javascript function.

function unloadPage()
{
    var abc= document.getElelmentById('hdfID').value;
    //hdfID is the id of hidden field.
    alert(abc) 
}

希望对您有所帮助.

hope it helps.

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