webvi-examples

Customize WebVI with CSS

Customize WebVI with CSS Demo Link Customize WebVI with CSS README Link

This example demonstrates how to customize the styling of a WebVI using CSS.

The underlying technology used by WebVIs is HTML Custom Elements. One of the advantages of using HTML Custom Elements is the ability leverage CSS in a web application that separates style from the content. For example, you could create a custom CSS file that is shared across your organization for custom styles and layouts.

Screenshot of Demo

Usage

You can use this approach in your own projects if you are familiar with CSS and how it interacts with HTML. For example, you can customize controls and indicators to match a corporate color scheme or make them accessible for color-blind users or in low contrast situations.

Dependencies

Setup

  1. Clone the ni/webvi-examples repository to your machine.
  2. Open CustomizeWithCss/CustomizeWithCss.gwebproject.
  3. On the Project Files tab, expand WebApp.gcomp and open index.gviweb.
  4. Click the Run button.
  5. Build the web application.
    a. On the Project Files tab, double-click WebApp.gcomp to open the web application component.
    b. On the Document tab, click Build.
    • To view the build output on your machine, click Output Directory on the Document tab once your application finishes building.
    • To launch and view the Web Application locally you can use the Run button on the Document tab.

Hosting

You can manually move the build output found at \CustomizeWithCss\Builds to any web server. This project also includes a Distribution (WebApp.lvdist) that can be used to build a package (.nipkg). Packages utilize NI Package Manager to automated the process of installing, upgrading, or removing the web app. A package is also a requirement for hosting a Web application on SystemLink Cloud.

The following steps can be used to host the web app on SystemLink Cloud

  1. Open CustomizeWithCss.gwebproject.
  2. Open WebApp.lvdist.
  3. Click the build icon in the top command bar of this distribution document
  4. Open a Web browser and navigate to https://www.systemlinkcloud.com/webapphosting
  5. Click the Choose nipkg button and select the nipkg built in step 3.
  6. When the upload is complete, click on your newly uploaded Web app from your list of Web apps

Local Hosting

The following steps can be used to host the web app on a local web server

Hosting on the NI Web Server with a nipkg

  1. Open CustomizeWithCss.gwebproject
  2. Open WebApp.lvdist.
  3. Click the build icon in the top command bar of this distribution document
  4. Double-click the nipkg and follow the on screen instructions
  5. Open a web browser and navigate to http://localhost:9090/customizewithcss/

Hosting on the LabVIEW 2009-2021 Web Server

  1. Open C:\Program Files (x86)\National Instruments\Shared\NI WebServer\www.
  2. Copy the WebApp_Default Web Server directory into the www directory.
  3. Open a web browser and navigate to http://localhost:8080/WebApp_Default%20Web%20Server/

Hosting on the NI Web Server

  1. Open C:\Program Files\National Instruments\Shared\Web Server\htdocs.
  2. Copy the WebApp_Default Web Server directory into the htdocs directory.
  3. Open a web browser and navigate to http://localhost:9090/WebApp_Default%20Web%20Server/.

Details

Adding custom CSS rules to a WebVI

  1. Add a CSS file to the root of the Web Application component, for example: custom_style.css
  2. Open index.gviweb and launch the HTML source dialog by pressing the Edit panel HTML button in the WebVI panel’s toolbar.

  3. Enter the following line inside the head section of the page right before the closing </head> tag.

     <link rel="stylesheet" href="custom_style.css">
  4. Click the OK button in the HTML source dialog and build the web application. Refer to the setup section for instructions on building a web application.
  5. Modify custom_style.css to include the style rules for the page

CSS rule behavior

The following section describes the behavior of the CSS rules used in the example. The style rules are included from the WebApp.gcomp/support/style.css file.

/*
Make the page background white.
Set the panel to blue with a drop shadow.
*/

ni-front-panel {
    background-color: #00adef;
    box-shadow: 0px 0px 18px 3px rgba(0, 0, 0, 0.75);
}

/*
Define a class for "example sections" with a white background color.
*/

.example-section {
    background-color: white;
}

/*********************************/

/*
Set the thumb to yellow when true, including its hover (mouseover) state.
*/

jqx-switch-button[checked] .jqx-thumb::after,
jqx-switch-button[checked]:hover .jqx-thumb::after {
    background: yellow;
}

/*********************************/

/*
Set the track to be transparent.
Set the track fill to yellow.
Set the track labels to be white.
*/

jqx-slider .jqx-container .jqx-track::before {
    background: transparent;
    border: none;
}

jqx-slider {
    --ni-fill-background: yellow;
    --ni-foreground-color: white !important;
}


/*********************************/

/*
Set the power button to have an orange foreground when true.
*/

.activation-button {
    --ni-true-foreground-color: orange;
}

/*
Set the power button to have a yellow background.
Set the circular progress bar to have a yellow fill.
*/

.activation-button.warning {
    --ni-true-background: yellow;
}

.activation-progress.warning {
    --ni-fill-background: yellow;
}

/*
Set the power button to have a red background.
Set the circular progress bar to have a red fill.
*/

.activation-button.danger {
    --ni-true-background: red;
}

.activation-progress.danger {
    --ni-fill-background: red;
}


/*********************************/

/*
Make the non-plot area and the plot area transparent.
Make the axis ticks white.
Make the axis labels light gray.
*/

ni-cartesian-graph {
    background: transparent;
    border: none;
}

ni-cartesian-graph .flot-x-axis text,
ni-cartesian-graph .flot-y-axis text {
    fill: white;
}

ni-cartesian-graph text.axisLabels {
    fill: lightgray;
}


/*********************************/

/*
Set the tank scale color to hotpink.
*/

jqx-tank {
    --ni-foreground-color: hotpink !important;
}

/*********************************/

/*
Make the numeric text white.
Remove all borders and background colors.
*/

jqx-numeric-text-box {
    --ni-border: none;
    --ni-foreground-color: white !important;
    --ni-indicator-background-color: transparent;
    --ni-control-background-color: transparent;
}
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