CODEWITHSUNDEEP
asp.netcss
user2801184
user2801184

Reputation: 329

Update CSS property from Code behind

I am new to web programming and need some help. I am using this CSS code to control look of a label dynamically. how can I change the value of the attribute "width"from code behind dynamically?Also I need to flash the label text. Please find my code below

**strong text**
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"> 
     <style type="text/css">
            .bar {
        position: relative;
        width: 250px;
        height: 25px;
        text-align: center;
        line-height: 25px;
        background: #003458;
        background: linear-gradient(to bottom, #005478 0%,#003747 100%);
        color: white;

    }

    .bar:before {
        position: absolute;
        display: block;
        top: 0;
        left: 0;
        bottom: 0;
        width: 40%;**** this value needs to be changed from code behind.
        content: '';
        background: rgba(0, 255, 0, 0.1);
    }
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
<asp:Label ID="Label18" runat= "server"  CssClass="bar">20%</asp:Label>

</ContentTemplate>

        </asp:UpdatePanel>

Solutions would be appreciated.

Thank you in advance!

Upvotes: 2

Views: 2723

Answers (2)

MikeSmithDev
MikeSmithDev

Reputation: 15797

You could set that width to a variable that you control:

.bar:before {
        position: absolute;
        display: block;
        top: 0;
        left: 0;
        bottom: 0;
        width: <%= BarWidth %>;
        content: '';
        background: rgba(0, 255, 0, 0.1);
    }

Then in your code behind, set it:

private string barWidth = "40%";

public string BarWidth
{
    get { return barWidth; }
    set { barWidth = value; }
}

protected void Page_Load(object sender, EventArgs e)
{
    barWidth="70%";
}

UPDATE: following your comment... here is a different approach. I renamed .bar:before to .barStatus and removed the width line from the CSS. You won't need the HiddenField like I have in the example... this is just an example so you can watch it work, and then fix it to be what you need for your code.

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <div id="_bar" class="bar"><span id="_barStatus" style="width:0%;" class="barStatus" runat="server"></span></div>
        <asp:Timer runat="server" id="Timer1" Interval="100" OnTick="UpdateBar"></asp:Timer>
        <asp:HiddenField ID="_barState" Value="10" runat="server" />
    </ContentTemplate>
</asp:UpdatePanel>

And the OnTick function:

protected void UpdateBar(object sender, EventArgs e)
{
    int barStatus = Convert.ToInt32(_barState.Value);
    if (barStatus < 100)
    {  
        barStatus += 2;
        _barState.Value = barStatus.ToString();
        _barStatus.Attributes["style"] = String.Format("width:{0}%;", barStatus);
        _barStatus.InnerText = String.Format("{0}%", barStatus);
    }
}

Upvotes: 3

Zainab
Zainab

Reputation: 25

For Label Width Label18.Style.Add("width","200px"); Label18.Width = 200; [ this will also work ]

For text display Label18.Text ="Whatever you want to display";

Upvotes: 0

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