svenrog / imageresizer.plugins.episerverblobreader Goto Github PK

Nothing much to describe here :) Just install NuGet package and it will register EPiServer Blob reader plugin for ImageResizer in order to serve and process images from EPiServer Media folders by ImageResizer.

If you use fluent API to resize the image and pass in null, string.Empty or ContentReference.EmptyReference you will get ArgumentNullException exception.

Most convenient way to render image in markup would be use HtmlHelper extension method:

@using ImageResizer.Plugins.EPiServer

<img src="@Html.ResizeImage(Model.CurrentPage.MainImage, 100, 100)" />

This will make sure that markup for visitors would be (assuming that image is png):

<img src="/.../image.png?w=100&h=100">

And also for the edit mode it would be generated something like this:

<img src="/.../image.png,,{CONTENT-ID}?epieditmode=False&w=100&h=100">

ResizeImage returns back UrlBuilder type, so you can fluently chain any additional paramters if needed:

<img src="@Html.ResizeImage(Model.CurrentPage.MainImage, 100, 150).Add("gradient", "true").Add("bgcolor", "red)" />

You can also use some basic fluent api support as well:

<img src="@Html.ResizeImage(CurrentPage.MainImage).Width(200)
                                                  .Height(200)
                                                  .Scale(ScaleMode.Both)
                                                  .FitMode(FitMode.Crop)" />

If you need to fallback to other image in cases when given ContentReference is empty (and don't want to check for null or ContentReference.EmptyReference yourself) you can use resize image with fallback:

<img src="@Html.ResizeImageWithFallback(CurrentPage.MainImage, "/no-image.jpg").Width(200).Height(200).Scale(ScaleMode.Both).FitMode(FitMode.Crop)" />

This is pretty simple as well.

1. We need to define picture profile. Profile is metadata how to render <picture> element.

public static PictureProfile SampleImage =
    new PictureProfile
    {
        SrcSetWidths = new[] { 480, 768, 992, 1200 },
        SrcSetSizes = new[]
        {
            "50vw",
        },
       DefaultWidth = 992
    };

Here we can specify couple of properties to customize element:

• Source set sizes (SrcSetSizes) - this regulates image size for various media conditions.
• Source set widths (SrcSetWidths) - this regulates various image sizes (resized by width specified here). Used to generate srcset attribute.
• Default width (DefaultWidth) - what is default width of the image. This is for old-school browsers those have no clue about <picture> element existence.

2. Call actual rendering method

@Html.ResizePicture(Model.CurrentPage.MainImage, PictureProfiles.SampleImage)

3. Code above generates following markup:

<picture>
    <source sizes="50vw"
            srcset="/globalassets/batman.jpg?w=480 480w,
                    /globalassets/batman.jpg?w=768 768w,
                    /globalassets/batman.jpg?w=992 992w,
                    /globalassets/batman.jpg?w=1200 1200w">
    <img alt="" src="/globalassets/batman.jpg?w=992">
</picture>

More info about how to render picture element - here.