How to set code behind properties in javascript

Question

Is it possible to set a property of the code behind using javascript?

I have the following:

private string dateFormat;
public string DateFormat
{
    get
    {
        return dateFormat;
    }
    set
    {
        dateFormat = value;
    }
}

and want to set it like this: '<%=DateFormat%>' = "dd-mm-YYYY"

But when I run this and add a debbugger it comes out like this: '' = "dd-mm-YYYY".

vvvvv · Accepted Answer · 2022-03-23 13:07:42Z

2

Try without quotes:

var <%=DateFormat%> = "dd-mm-YYYY";

but in your case the property does not have a value so you should check if it is set.

edited Mar 23, 2022 at 13:07

vvvvv

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answered Nov 15, 2012 at 12:14

Onur Topal

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Comments

Rawling · Accepted Answer · 2012-11-15 12:12:24Z

1

You can't do this directly; you need to use an ASP.NET hidden field which will then return the value to your code on a postback, and persist it across multiple postbacks.

The C# would be like

public string DateFormat
{
    get
    {
        return DateFormatField.Value;
    }
    set
    {
        DateFormatField.Value = value;
    }
}

The JavaScript to set it would be something like

document.getElementById('<%=DateFormatField.ClientID%>').value = 'dd-mm-YYYY';

answered Nov 15, 2012 at 12:12

Rawling

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