coil-kt/coil

Error image not displayed in Compose Wasm

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#2786 opened on Jan 14, 2025

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 (2 comments) (0 reactions) (0 assignees)Kotlin (11,779 stars) (757 forks)batch import
help wanted

Description

Describe the bug When an URL fails to load, the "error" image is not displayed on the web target. I'm trying to test a case where I load a value like "invalid url".

image

The same code works fine on Desktop:

image

The logs show that loading the image fails, but it doesn't display the error resource:

🚨 Failed - invalid url
KotlinConfApp-ui-components-gallery-wasm-js.uninstantiated.mjs:129 IllegalStateException: Unable to create a fetcher that supports: invalid url
    at kotlin.captureStackTrace (webpack-internal:///./kotlin/KotlinConfApp-ui-components-gallery-wasm-js.uninstantiated.mjs:21:44)
    at <KotlinConfApp:ui-components-gallery>.kotlin.captureStackTrace__externalAdapter (http://localhost:8080/536236261657b35af741.wasm:wasm-function[13473]:0x3c0e80)
    at <KotlinConfApp:ui-components-gallery>.kotlin.Throwable.<init> (http://localhost:8080/536236261657b35af741.wasm:wasm-function[13463]:0x3c0cd6)
    at <KotlinConfApp:ui-components-gallery>.kotlin.Throwable.<init> (http://localhost:8080/536236261657b35af741.wasm:wasm-function[13464]:0x3c0d0f)
    at <KotlinConfApp:ui-components-gallery>.kotlin.Exception.<init> (http://localhost:8080/536236261657b35af741.wasm:wasm-function[13849]:0x3c543e)
    at <KotlinConfApp:ui-components-gallery>.kotlin.RuntimeException.<init> (http://localhost:8080/536236261657b35af741.wasm:wasm-function[13839]:0x3c5260)
    at <KotlinConfApp:ui-components-gallery>.kotlin.IllegalStateException.<init> (http://localhost:8080/536236261657b35af741.wasm:wasm-function[13854]:0x3c552d)
    at <KotlinConfApp:ui-components-gallery>.coil3.intercept.$fetchCOROUTINE$4.doResume (http://localhost:8080/536236261657b35af741.wasm:wasm-function[61530]:0x81fcde)
    at <KotlinConfApp:ui-components-gallery>.coil3.intercept.EngineInterceptor.fetch (http://localhost:8080/536236261657b35af741.wasm:wasm-function[61541]:0x8203dc)
    at <KotlinConfApp:ui-components-gallery>.coil3.intercept.$executeCOROUTINE$3.doResume (http://localhost:8080/536236261657b35af741.wasm:wasm-function[61528]:0x81f7fa)

KotlinConfApp-ui-components-gallery-wasm-js.uninstantiated.mjs:129 🚨 Failed - invalid url

Other errors produce the correct behavior, for example, trying to load "https://example.com/not-an-image.jpg" throws a CORS error and displays the error drawable as expected. Just not completely invalid strings like the one shown here.

To Reproduce

AsyncImage(
    model = "invalid url",
    contentDescription = null,
    modifier = Modifier.size(96.dp),
    placeholder = painterResource(Res.drawable.kodee_emotion_positive), // Any value could go here
    error = painterResource(Res.drawable.kodee_emotion_neutral), // Any value could go here
)

Version 3.0.3

Contributor guide

Tech stack
kotlinwasm
Domain
frontendmobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic Kotlin knowledgefamiliarity with Composeunderstanding of image loading concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the fetcher creation in Coil's engine. The error indicates that no fetcher supports 'invalid url' on Wasm, but desktop handles it. Check the EngineInterceptor class and the fetcher factory implementations for Wasm. Compare how the error drawable is displayed when a fetcher cannot be created. Possibly the Wasm target lacks a fallback to show the error painter when no fetcher is found.