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MVC: How to set style or class attributes on HTML elements from code?

Posted on 2016-08-31
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Last Modified: 2016-09-01
I have a partial view in an MVC project that is inserted once for each item in a collection, kind of like a user control. Each view needs to have its border, background and foreground color set depending on certain values in the Model.
Is there a way to set the style or class attributes based on these values from code?
Here's some code to explain:
@model IEnumerable<AccountViewModel>
@{
    ViewData["Title"] = "Accounts";
}

<h3>Accounts overview</h3>
<div class="row">

    @foreach (var item in Model)
    {
        <div class="well well-sm col-lg-2 col-md-3 col-sm-4 col-xs-6">
            @Html.Partial("_DashboardItem", item)
            <br />
        </div>
    }

</div>

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Right now, each instance of "_DashboardItem" is simply:
@model AccountViewModel

<div class="panel panel-primary text-center">
    <div class="panel-heading">@Model.AccountName</div>
    <div class="panel-body">
        <div class="table-responsive">
            <table class="table table-hover table-condensed">
                <tr>
                    <td>@Model.Status.Ask</td>
                </tr>
                <tr>
                    <td>@Model.EquityPercent</td>
                </tr>
                <tr>
                    <td>@Model.Weight</td>
                </tr>
            </table>
        </div>
    </div>
    <div class="panel-footer">
        @Model.Status.LastUpdated
    </div>
</div>

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The problem is to change colors based on the incoming values so that if f.ex. @Model.EquityPercent is above 50, then the table's background is green and so on.

Any good ideas?
TIA!
Dennis
0
Comment
Question by:Dennis_Gundersen
2 Comments
 
LVL 23

Accepted Solution

by:
Ioannis Paraskevopoulos earned 250 total points
ID: 41779408
Hi,

you can define your css classes. I am not going to say what code will they have, but let's say you have table-green, table-yellow and tabe-red.

Then in your partial view you may have it this way:

@model AccountViewModel
@{
var tableClass = "table-green";
if(Model.EquityPercent < 50 && Model.EquityPercent >= 15){
    tableClass = "table-yellow";
}
if (Model.EquityPercentage < 15){
    tableClass = "table-red";
}
}
<div class="panel panel-primary text-center">
    <div class="panel-heading">@Model.AccountName</div>
    <div class="panel-body">
        <div class="table-responsive">
            <table class="table table-hover table-condensed @tableClass">
                <tr>
                    <td>@Model.Status.Ask</td>
                </tr>
                <tr>
                    <td>@Model.EquityPercent</td>
                </tr>
                <tr>
                    <td>@Model.Weight</td>
                </tr>
            </table>
        </div>
    </div>
    <div class="panel-footer">
        @Model.Status.LastUpdated
    </div>
</div>

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Giannis
0
 
LVL 55

Assisted Solution

by:Julian Hansen
Julian Hansen earned 250 total points
ID: 41779442
The standard way of solving this is
Put your unchanging styles in your css
and then
a) Add style tags to the elements that need specific styling
OR
b) If your colour changes are static - i.e. they are a known set then you can define the colours as separate styles and then use a condition in your code to add the correct class to each element

So, either in-line overrides
<div class="panel ..." style="background: blue; border-color: red; color: green">

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Or predefined classes
CSS stylesheet
...
.bg-blue {
   background: blue;
}
.border-red {
   border-color: red;
}
.fg-green {
  color: green;
}
...

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HTML
<div class="panel ... bg-blue border-red fg-green"

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