javascript 如何从asp.net隐藏字段设置和获取布尔值
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How to set and get Boolean value from a asp.net hidden field
提问by user1926138
I have a hidden field. Where I need to set a Boolean value intitially. After some operation I need to update the hidden filed value using JavaScript. But we can only store string value in hidden field. How to set/get Boolean value in hidden field?
我有一个隐藏字段。我需要最初设置布尔值的地方。一些操作后,我需要使用 JavaScript 更新隐藏的字段值。但是我们只能在隐藏字段中存储字符串值。如何在隐藏字段中设置/获取布尔值?
Any Idea how to implement it?
任何想法如何实施它?
回答by Mike W
As you correctly noticed - you can only store String in HiddenField Value. To determine boolean value in Code Behind - you should Convert String Value to Bool.
正如您正确注意到的那样 - 您只能将 String 存储在 HiddenField Value 中。要确定代码隐藏中的布尔值 - 您应该将字符串值转换为布尔值。
For example:
例如:
bool val = Convert.ToBoolean(HiddenField1.Value);
To set Hidden Field value:
设置隐藏字段值:
HiddenField1.Value = val.ToString();
in JavaScript - you can accomplish this by using:
在 JavaScript 中 - 您可以使用以下方法完成此操作:
var hiddenFieldValueString = document.getElementById("HiddenField1").value;
var val = (hiddenFieldValueString === "true");
setting new Hidden Field Value:
设置新的隐藏字段值:
document.getElementById("HiddenField1").value = val;
回答by User125
You can use it without converting into Boolean
您可以使用它而无需转换为布尔值
<asp:HiddenField ID="hf" runat="server" Value="True" />
<script type="text/javascript">
var hf = document.getElementById('<%= hf.ClientID %>');
if (hf.value == "True") {
//your code
hf.value == "False";
} else {
//your code
hf.value == "True";
}
</script>