ASP的设置Text属性：标签在Javascript中有道 [英] Set Text property of asp:label in Javascript PROPER way
问题描述
我有一个表格上的一系列文本框。当用户插入数字到这些文本框，计算由和＆LT; ASP：标签＆gt; 控件通过JavaScript更新，以反映这些计算：
的document.getElementById（'＆LT;％= TotalLoans.ClientID％GT;'）。innerHTML的= TotalLoans;
这正确地更新UI。然而，当我尝试在codebehind访问值时，文本属性为空。这是有道理的我想，因为我是通过JavaScript的更新的innerHTML 属性。
// TotalLoans.Text将始终等于在这种情况下
双bTotalLoans = string.IsNullOrEmpty（TotalLoans.Text）
？ 0.00
：Convert.ToDouble（TotalLoans.Text）;
如何更新的文本属性＆LT; ASP：;以这样的方式通过JavaScript标签＆gt我可以读取codebehind财产？
更新
这是一个包含41标签，每个显示一些计算用户的结果大表上的一个小问题。以FishBasketGordo的意见，我将我的＆LT; ASP：标签＆gt; 来禁用＆LT; ASP：文本框＆GT; 。我设置了新的文本框的值，例如：
的document.getElementById（'＆LT;％= TotalLoans.ClientID％GT;'）。值= TotalLoans;
再次在codebehind， TotalLoans.Text 的值总是等于
我不介意改变我如何处理这一点，但这里是问题的症结所在。
我使用JavaScript来操纵某些控件的属性值。我需要能够从当提交被点击后面的code访问这些操纵值。
任何意见，我怎么能去呢？
更新2
关于通过@詹姆斯 - 约翰逊的回答，我不能作为建议检索使用 .innerText 属性的值。我有的EnableViewState 设置为true的＆LT; ASP：标签＆gt; 。有没有别的我丢失的东西吗？
我不明白为什么，当我在一个文本框输入并提交表单，我可以在codebehind访问的价值，但是当我编程由JavaScript的方式改变一个文本框或标签的文本，我无法访问新的价值。
将HiddenField控件在窗体中。
＆LT; ASP：HiddenField ID =隐藏=服务器/＆GT;
创建形式的属性
保护字符串LabelProperty
{
得到
{
返回hidden.Value;
}
组
{
hidden.Value =价值;
}
}
更新从JavaScript的隐藏字段值
＆LT;脚本＆GT;
功能UpdateControl（）{
的document.getElementById（'＆LT;％= hidden.ClientID％GT;'）。值='12';
}
＆LT; / SCRIPT＆GT;
现在，你可以在整个回发直接访问该物业。在标签控制更新的值将在回传的情况下，会丢失它被直接用于code后面。
I have a series of textboxes on a form. When the user inserts numbers into these textboxes, calculations are made and <asp:Label> controls are updated via JavaScript to reflect these calculations:
document.getElementById('<%=TotalLoans.ClientID %>').innerHTML = TotalLoans;
This correctly updates the UI. However, when I try to access the value in the codebehind, the Text property is empty. This makes sense I guess, since I was updating the innerHTML property via the JavaScript.
//TotalLoans.Text will always be equal to "" in this scenario
double bTotalLoans = string.IsNullOrEmpty(TotalLoans.Text)
? 0.00
: Convert.ToDouble(TotalLoans.Text);
How do I update the Text property of the <asp:Label> via JavaScript in such a way that I can read the property in the codebehind?
Update
This is a small problem on a large form that contains 41 labels, each of which displays the results of some calculation for the user. Taking the advice of FishBasketGordo I converted my <asp:Label> to a disabled <asp:TextBox>. I'm setting the value of the new textbox as such:
document.getElementById('<%=TotalLoans.ClientID %>').value = TotalLoans;
Again, in the codebehind, the value of TotalLoans.Text is always equal to "".
I don't mind changing how I approach this, but here's the crux of the matter.
I am using JavaScript to manipulate the property values of some controls. I need to be able to access these manipulated values from the code behind when 'Submit' is clicked.
Any advice how I can go about this?
Update 2
Regarding the answer by @James Johnson, I am not able to retrieve the value using .innerText property as suggested. I have EnableViewState set to true on the <asp:Label>. Is there something else I am missing?
I don't understand why, when I type in a textbox and submit the form, I can access the value in the codebehind, but when I programmatically change the text of a textbox or label by way of JavaScript, I cannot access the new value.
Place HiddenField Control in your Form.
<asp:HiddenField ID="hidden" runat="server" />
Create a Property in the Form
protected String LabelProperty
{
get
{
return hidden.Value;
}
set
{
hidden.Value = value;
}
}
Update the Hidden Field value from JavaScript
<script>
function UpdateControl() {
document.getElementById('<%=hidden.ClientID %>').value = '12';
}
</script>
Now you can access the Property directly across the Postback. The Label Control updated value will be Lost across PostBack in case it is being used directly in code behind .
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