文本框值在服务器端不可用。 [英] Textbox value not available on server side.

问题描述

我通过javascript为ASP.NET页面设置了Textbox的值，但在回发中，该值显示为空字符串。我没有禁用ViewState。我试图在服务器上获取的文本框的值是txtTotalSplit。我正在使用以下javascript代码来设置它。



有什么建议吗？

I am setting a value of Textbox via javascript for ASP.NET page but in postback the value is showing empty string. I haven''t disabled ViewState .The textbox''s value I am trying to get on the server is of txtTotalSplit. I am using following javascript code to set it.

Any suggestion ?

function totalSplit() {
        var cash = document.getElementById('<%=txtCash.ClientID %>').value;
        var creditcard = document.getElementById('<%=txtCreditCard.ClientID %>').value;
        var eft = document.getElementById('<%=txtEFT.ClientID %>').value;
        var amax = document.getElementById('<%=txtAMEX.ClientID %>').value;
        var cheque = document.getElementById('<%=txtCheque.ClientID %>').value;
        var total=0;

        if (!(cash == "")) total += parseFloat(cash.toString());
        if (!(creditcard == "")) total += parseFloat(creditcard.toString());
        if (!(eft == "")) total += parseFloat(eft.toString());
        if (!(amax == "")) total += parseFloat(amax.toString());
        if (!(cheque == "")) total += parseFloat(cheque.toString());
        document.getElementById('<%=txtTotalSplit.ClientID %>').value = parseFloat(total.toString()).toString();

    }

以下是否有任何问题

Is Anything wrong with following

document.getElementById('<%=txtTotalSplit.ClientID %>').value = parseFloat(total.toString()).toString();

推荐答案

您可以按如下方式调试：



1.在下一行中设置一个固定值，看看你是否在PostBack中得到了值：

You can debug this as follows:

1. Set a fixed value in the following line and see whether you get the value in PostBack:

document.getElementById(''<%=txtTotalSplit.ClientID %>'').value = ''100'';

2.如果您获得了价值，这意味着您在以下代码中遇到问题，并且您需要修复它。

2. If you get the value, that means, you have problem in the following code, and, you need to fix it.

parseFloat(total.toString()).toString();

3.如果您没有得到该值，请确保以下代码返回正确找到文本框：

3. If you don''t get the value, make sure the following code returns finds a textbox correctly:

document.getElementById(''<%=txtTotalSplit.ClientID %>'')

此外，请确保以下方法是正确执行没有任何错误：

And also, make sure the following method is executed correctly without any error :

totalSplit()

希望你的问题能得到解决。

Hopefully, your problem will be solved.

参考我的代码和下面的代码工作正常myend



javascript代码

refer my code and below code working fine myend

javascript code

function setTextDynamically() 
{
var total = 100;
document.getElementById('<%=txtTest.ClientID %>').value = parseFloat(total.toString()).toString();
        }

html代码

html code

<asp:TextBox ID="txtTest" runat="server"></asp:TextBox>
        <asp:Button id="btnTest" runat="server" Text="Set Text Box" OnClientClick="setTextDynamically();" />

        <asp:Button ID="btnGet" runat="server" Text="Get Value" />

代码背后

code behind

protected void Page_Load(object sender, EventArgs e)
    {
        btnGet.Click += new EventHandler(btnGet_Click);
    }

    void btnGet_Click(object sender, EventArgs e)
    {
        Response.Write(txtTest.Text);
    }

首先，在您提供的代码中， Enabled =false不包括在内。



其次，如果 Enabled =false包含在Server控件中，则以下呈现HTML

First, in the code you provided, the Enabled="false" is not included.

Second, if the Enabled="false" is included the Server control, the following HTML is renderered

<input type="text" disabled="disabled" id="txtTest" name="txtTest">

而且，在这种情况下，用户也无法修改文本框的值，更不用说JavaScript了。



所以，这是问题的主要原因。

And, in this case, user also cannot modify the value of the text box, let alone the JavaScript.

So, this was the main reason of the problem.

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