How to set and get Boolean value from a asp.net hidden field

javascript asp.net hidden-field boolean-operations
user1926138 picture user1926138 · Jan 5, 2015 · Viewed 19.1k times · Source

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?

Any Idea how to implement it?

Answer

Mike W picture Mike W · Jan 5, 2015

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.

For example:

bool val = Convert.ToBoolean(HiddenField1.Value);

To set Hidden Field value:

HiddenField1.Value = val.ToString();

in JavaScript - you can accomplish this by using: 

var hiddenFieldValueString = document.getElementById("HiddenField1").value;
var val = (hiddenFieldValueString === "true");

setting new Hidden Field Value:

document.getElementById("HiddenField1").value = val;

Related questions

asp.net hidden field not retaining value when updated from code behind

I'm using a hidden field to store a value in an asp.net page. Basically I set the value of the hidden field whenever a value on the form is changed i.e. first name, date etc. The field is …

Read More
Hidden value assigned in js lost after postback

Here's my problem. I have a hidden field whose value I change through a javascript method. The problem is after postback the value is lost. How can I persist the value after postback? Thanks! .aspx File <asp:HiddenField ID="…

Read More
Change the selected value of a drop-down list with jQuery

I have a drop-down list with known values. What I'm trying to do is set the drop down list to a particular value that I know exists using jQuery. Using regular JavaScript, I would do something like: ddl = document.getElementById("…

Read More