# Web App Development

**URL:** https://forum.webostv.developer.lge.com/c/web-app-development/35.md?page=6

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**Page:** 7

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## [Unable to Install Developer Mode App on LG UP7500PVG](https://forum.webostv.developer.lge.com/t/unable-to-install-developer-mode-app-on-lg-up7500pvg/22877)

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**Author:** [@esonesa12](https://forum.webostv.developer.lge.com/u/esonesa12)\
**Replies:** 1\
**Last updated:** [February 12, 2025, 11:19pm UTC](https://forum.webostv.developer.lge.com/t/unable-to-install-developer-mode-app-on-lg-up7500pvg/22877 "2025-02-12T23:19:23Z")

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Hello, I’m experiencing an issue while trying to install the Developer Mode app on my LG Smart TV (model: UP7500PVG, webOS version: 6.4.0-22). Here’s what happens:

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## [Multiple videos not playing Now](https://forum.webostv.developer.lge.com/t/multiple-videos-not-playing-now/22806)

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**Author:** [@user1003](https://forum.webostv.developer.lge.com/u/user1003)\
**Replies:** 0\
**Last updated:** [February 11, 2025, 11:23pm UTC](https://forum.webostv.developer.lge.com/t/multiple-videos-not-playing-now/22806 "2025-02-11T23:23:13Z")

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Multiple videos not playing Now Works fine in webos 22, 24 simulator environment. Deployment test failed on TV model 27TQ600SW “webos developer mode” The link below says it is possible, but when tested, only one video…

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## [Multiple videos not playing](https://forum.webostv.developer.lge.com/t/multiple-videos-not-playing/22722)

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**Author:** [@yongun](https://forum.webostv.developer.lge.com/u/yongun)\
**Replies:** 1\
**Last updated:** [February 11, 2025, 7:31am UTC](https://forum.webostv.developer.lge.com/t/multiple-videos-not-playing/22722 "2025-02-11T07:31:04Z")

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Multiple videos not playing Works fine in webos 22, 24 simulator environment. Deployment test failed on TV model 27TQ600SW “webos developer mode” The link below says it is possible, but when tested, only one video pla…

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## [기능 지원 계획이 궁금합니다.](https://forum.webostv.developer.lge.com/t/topic/22694)

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**Author:** [@user615](https://forum.webostv.developer.lge.com/u/user615)\
**Replies:** 1\
**Last updated:** [February 10, 2025, 11:28pm UTC](https://forum.webostv.developer.lge.com/t/topic/22694 "2025-02-10T23:28:49Z")

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안녕하세요. webos webapp을 개발중입니다. 두개 이상의 미디어 재생에 대해서 기능이 작동하지 않아서 문의드립니다. Multiple video tags to simultaneously play video content Can video and audio tags play together? webos 시뮬레이터에서 관련 기능이 이미 지원되지 않음을 위 토픽을 통하여 확인하였으나,…

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## [Error when canceling a service subscription from the service side](https://forum.webostv.developer.lge.com/t/error-when-canceling-a-service-subscription-from-the-service-side/19640)

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**Author:** [@dprovinciani](https://forum.webostv.developer.lge.com/u/dprovinciani)\
**Replies:** 1\
**Last updated:** [February 6, 2025, 11:23pm UTC](https://forum.webostv.developer.lge.com/t/error-when-canceling-a-service-subscription-from-the-service-side/19640 "2025-02-06T23:23:22Z")

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I see in the webs-service reference that the message object has a cancel method to notify a subscribed call that no more responses will be sent (see link). When I call this method, I see the following error: So, here…

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## [Web App에서 iframe 으로 html video source를 통해 play 되지 않는 이유가 무엇인가요?](https://forum.webostv.developer.lge.com/t/web-app-iframe-html-video-source-play/19625)

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**Author:** [@jhlee.ymtech](https://forum.webostv.developer.lge.com/u/jhlee.ymtech)\
**Replies:** 1\
**Last updated:** [February 6, 2025, 6:09am UTC](https://forum.webostv.developer.lge.com/t/web-app-iframe-html-video-source-play/19625 "2025-02-06T06:09:56Z")

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안녕하세요. Web App을 개발하여 WebOS 내장된 LG스탠바이미에 배포하였습니다. 해당 App에서 Iframe을 통해 지도(Vworld)를 불러오고 해당 지도에서 CCTV 영상을 제공하는 부분이 있습니다. 해당 CCTV 영상은 html video source를 통해 URL로 데이터를 받아 play합니다. 그런데 CCTV영상이 나오지 않는데 원인이 무엇인지 알 수 있을까요? (L…

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## ["Failed to load module script" error on webOS 5+ LG TVs](https://forum.webostv.developer.lge.com/t/failed-to-load-module-script-error-on-webos-5-lg-tvs/2351)

<div class="topic-metadata">

**Author:** [@jonybekov](https://forum.webostv.developer.lge.com/u/jonybekov)\
**Replies:** 19\
**Last updated:** [February 5, 2025, 1:30pm UTC](https://forum.webostv.developer.lge.com/t/failed-to-load-module-script-error-on-webos-5-lg-tvs/2351 "2025-02-05T13:30:49Z")

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I am experiencing an issue with my web app on a webOS 5+ LG TV. When I try to load a module script using the \<script type="module"\> tag, I receive a “Failed to load module script” error in the browser console. The error …

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## [Keycode mapping](https://forum.webostv.developer.lge.com/t/keycode-mapping/19591)

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**Author:** [@harshjeet](https://forum.webostv.developer.lge.com/u/harshjeet)\
**Replies:** 1\
**Last updated:** [February 5, 2025, 7:58am UTC](https://forum.webostv.developer.lge.com/t/keycode-mapping/19591 "2025-02-05T07:58:53Z")

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i am making a game using coco editor , but in cocos editor there is no such keycode for red, green, blue or yellow button , even i mapped the keycode (403,404,405 so on ) it is not listening , but when i create in simple…

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## [Error calling luna://com.webos.service.tv.systemproperty from JS services](https://forum.webostv.developer.lge.com/t/error-calling-luna-com-webos-service-tv-systemproperty-from-js-services/19429)

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**Author:** [@dprovinciani](https://forum.webostv.developer.lge.com/u/dprovinciani)\
**Replies:** 4\
**Last updated:** [February 5, 2025, 12:04am UTC](https://forum.webostv.developer.lge.com/t/error-calling-luna-com-webos-service-tv-systemproperty-from-js-services/19429 "2025-02-05T00:04:44Z")

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I’m implementing a JS service to be used by web apps. The service works well, and I can successfully call each of the commands defined in the services.json file from a web app. However, I am facing an issue when trying …

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## [Virtual keyboard automatically closes after 2 minutes](https://forum.webostv.developer.lge.com/t/virtual-keyboard-automatically-closes-after-2-minutes/19536)

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**Author:** [@Aida\_Ban](https://forum.webostv.developer.lge.com/u/Aida_Ban)\
**Replies:** 1\
**Last updated:** [February 4, 2025, 5:53am UTC](https://forum.webostv.developer.lge.com/t/virtual-keyboard-automatically-closes-after-2-minutes/19536 "2025-02-04T05:53:02Z")

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Leaving the TV idle with the virtual keyboard open, after about 2 minutes it closes. The input remains focused. Is there a way to programmatically disable this behavior? Or at least a way to differentiate between a user-…

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## [API for WiFi RSSI & MAC Address in Web App](https://forum.webostv.developer.lge.com/t/api-for-wifi-rssi-mac-address-in-web-app/19448)

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**Author:** [@olivier.sii](https://forum.webostv.developer.lge.com/u/olivier.sii)\
**Replies:** 1\
**Last updated:** [February 4, 2025, 5:16am UTC](https://forum.webostv.developer.lge.com/t/api-for-wifi-rssi-mac-address-in-web-app/19448 "2025-02-04T05:16:10Z")

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I am developing a WebOS Web App, and I would like to know if there is an API to retrieve the WiFi RSSI (Received Signal Strength Indicator). Additionally, could you confirm whether the device’s MAC address is still not …

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## [Service worker caching](https://forum.webostv.developer.lge.com/t/service-worker-caching/4257)

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**Author:** [@user2247](https://forum.webostv.developer.lge.com/u/user2247)\
**Replies:** 5\
**Last updated:** [February 3, 2025, 11:24pm UTC](https://forum.webostv.developer.lge.com/t/service-worker-caching/4257 "2025-02-03T23:24:35Z")

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From the documentation here Web API and Web Engine | webOS TV Developer , it says “The stored cache is used only while the web browser engine is running and is not used anymore once an app has been terminated” , does tha…

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## [Glitches during preload](https://forum.webostv.developer.lge.com/t/glitches-during-preload/19339)

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**Author:** [@ID2Bytes](https://forum.webostv.developer.lge.com/u/ID2Bytes)\
**Replies:** 1\
**Last updated:** [February 3, 2025, 5:24am UTC](https://forum.webostv.developer.lge.com/t/glitches-during-preload/19339 "2025-02-03T05:24:48Z")

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I am developing a video player on the LG webOS tv platform. I have trouble with (pre)loading the data on LG WebOS 4.0 displays. I read in the HCAP documentation that there is a specific video and app layer, and that a v…

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## [Add ability to set home screen to app of default home page](https://forum.webostv.developer.lge.com/t/add-ability-to-set-home-screen-to-app-of-default-home-page/19246)

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**Author:** [@user654](https://forum.webostv.developer.lge.com/u/user654)\
**Replies:** 1\
**Last updated:** [February 3, 2025, 5:19am UTC](https://forum.webostv.developer.lge.com/t/add-ability-to-set-home-screen-to-app-of-default-home-page/19246 "2025-02-03T05:19:43Z")

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Can LG add the ability to set home screen to app of default home page?

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## [Splash screen issu](https://forum.webostv.developer.lge.com/t/splash-screen-issu/19030)

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**Author:** [@harshjeet](https://forum.webostv.developer.lge.com/u/harshjeet)\
**Replies:** 1\
**Last updated:** [January 22, 2025, 2:04am UTC](https://forum.webostv.developer.lge.com/t/splash-screen-issu/19030 "2025-01-22T02:04:33Z")

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{ "id": "com.webos.demo", "version": "1.0.0", "vendor": "My Company", "type": "web", "main": "index.html", "title": "demo\_game", "icon": "icon.png", "largeIcon": "largeIcon.png", "splashBackground": "sp…

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## [webOS Text To Speech](https://forum.webostv.developer.lge.com/t/webos-text-to-speech/9168)

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**Author:** [@max.cohen](https://forum.webostv.developer.lge.com/u/max.cohen)\
**Replies:** 13\
**Last updated:** [January 21, 2025, 4:27pm UTC](https://forum.webostv.developer.lge.com/t/webos-text-to-speech/9168 "2025-01-21T16:27:33Z")

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I am looking to implement TTS on my web app. It appears that both aria-live regions and the SpeechSynthesis API are not supported by webOS. I found these docs which suggest using the webOS TTS service. com.webos.service…

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## [App displays correctly on webos 6.0 simulator and is broken on webos 6.0 emulator](https://forum.webostv.developer.lge.com/t/app-displays-correctly-on-webos-6-0-simulator-and-is-broken-on-webos-6-0-emulator/11917)

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**Author:** [@nuukde](https://forum.webostv.developer.lge.com/u/nuukde)\
**Replies:** 3\
**Last updated:** [January 21, 2025, 7:12am UTC](https://forum.webostv.developer.lge.com/t/app-displays-correctly-on-webos-6-0-simulator-and-is-broken-on-webos-6-0-emulator/11917 "2025-01-21T07:12:55Z")

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Our web hosted app was bounced back from Q&A with a broken layout report. We can reproduce the issue on the webos 6.0 deprecated emulator but it displays flawlessly on the recommended simulator tool running webos 6.0 web…

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## [Creating game on webos](https://forum.webostv.developer.lge.com/t/creating-game-on-webos/18702)

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**Author:** [@harshjeet](https://forum.webostv.developer.lge.com/u/harshjeet)\
**Replies:** 10\
**Last updated:** [January 13, 2025, 6:10am UTC](https://forum.webostv.developer.lge.com/t/creating-game-on-webos/18702 "2025-01-13T06:10:53Z")

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Hi webos family, I want to create games for webos, how can i proceed so that game will run on low resource but give high performance, i want to build a racing game, how can i do ?

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## [Exit Youtube/Netflix app and go back to my current app](https://forum.webostv.developer.lge.com/t/exit-youtube-netflix-app-and-go-back-to-my-current-app/18322)

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**Author:** [@user251](https://forum.webostv.developer.lge.com/u/user251)\
**Replies:** 2\
**Last updated:** [January 10, 2025, 1:18pm UTC](https://forum.webostv.developer.lge.com/t/exit-youtube-netflix-app-and-go-back-to-my-current-app/18322 "2025-01-10T13:18:21Z")

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Hello everyone, I am developing an app that has the feature of opening Youtube, Netflix app when clicking on the icon. I have used Application Manager API to open the app. I am having a problem that is there a way to go …

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## [Appicon background color and tile color do not match](https://forum.webostv.developer.lge.com/t/appicon-background-color-and-tile-color-do-not-match/18675)

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**Author:** [@peafowlinc](https://forum.webostv.developer.lge.com/u/peafowlinc)\
**Replies:** 2\
**Last updated:** [January 10, 2025, 1:16pm UTC](https://forum.webostv.developer.lge.com/t/appicon-background-color-and-tile-color-do-not-match/18675 "2025-01-10T13:16:37Z")

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Please match the appicon background color and tile color. / Gradient is not possible. Pretest / Image need more clarity on this issue.

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## [Playing DASH Streaming Video on webOS APP](https://forum.webostv.developer.lge.com/t/playing-dash-streaming-video-on-webos-app/10365)

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**Author:** [@AlvaroPlexus](https://forum.webostv.developer.lge.com/u/AlvaroPlexus)\
**Replies:** 2\
**Last updated:** [January 10, 2025, 1:14pm UTC](https://forum.webostv.developer.lge.com/t/playing-dash-streaming-video-on-webos-app/10365 "2025-01-10T13:14:28Z")

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Hello, We are trying to play DASH streaming video on an app for a 55UH625V model screen, but we’re not sure if the screen is compatible. The stream in question is the following: https://live.codereext.edge2befaster.io/…

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## [Webgl 실행 시 cache 관련 문의](https://forum.webostv.developer.lge.com/t/webgl-cache/18631)

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**Author:** [@hc.jung](https://forum.webostv.developer.lge.com/u/hc.jung)\
**Replies:** 1\
**Last updated:** [January 8, 2025, 11:46pm UTC](https://forum.webostv.developer.lge.com/t/webgl-cache/18631 "2025-01-08T23:46:04Z")

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데이터 캐싱 문제를 겪고 있어 관련된 담당자분께 문의드리고자 합니다. Unity WebGL 빌드를 webOS 디바이스에서 실행할 때, IndexedDB를 이용한 데이터 캐싱이 정상적으로 작동하지 않고 있습니다. WebLoadingTest 링크를 PC 크롬에서 접속할 때는 데이터가 정상적으로 캐싱되고 불러와지지만, TV(oled55c4sna)에서는 캐싱이 되지 않는 문제가 발생하고 있습니…

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## [What framework to use in OTT app for webOS?](https://forum.webostv.developer.lge.com/t/what-framework-to-use-in-ott-app-for-webos/5260)

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**Author:** [@isaacjon](https://forum.webostv.developer.lge.com/u/isaacjon)\
**Replies:** 5\
**Last updated:** [January 8, 2025, 12:24am UTC](https://forum.webostv.developer.lge.com/t/what-framework-to-use-in-ott-app-for-webos/5260 "2025-01-08T00:24:50Z")

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Hi eveyone. i am building an OTT app. i can’t decide what framework to use. should i use enact.js or react or next or vue or nuxt or even maybe vanilla js? i am lost completely. currenly I have knowledge of react/next. …

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## [Aria-press does not work](https://forum.webostv.developer.lge.com/t/aria-press-does-not-work/18605)

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**Author:** [@user557](https://forum.webostv.developer.lge.com/u/user557)\
**Replies:** 1\
**Last updated:** [January 8, 2025, 12:03am UTC](https://forum.webostv.developer.lge.com/t/aria-press-does-not-work/18605 "2025-01-08T00:03:59Z")

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do you know if aria-press can work on LG device? also how to check if tts is enabled? can we do window.webos? or we need to use luna bus?

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## [Stall occurs in webos 4.1](https://forum.webostv.developer.lge.com/t/stall-occurs-in-webos-4-1/18490)

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**Author:** [@bluuue](https://forum.webostv.developer.lge.com/u/bluuue)\
**Replies:** 1\
**Last updated:** [January 7, 2025, 8:22am UTC](https://forum.webostv.developer.lge.com/t/stall-occurs-in-webos-4-1/18490 "2025-01-07T08:22:39Z")

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Hello. I am developing a player on webos 4.1 and stalls occur continuously. I am using shaka 4.1.7 version and when stall occurs, I stop and play, but intermittently, the stop and play do not work. When I seek at this …

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## [Hosted Apps and the Motion Sensor API](https://forum.webostv.developer.lge.com/t/hosted-apps-and-the-motion-sensor-api/5917)

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**Author:** [@XRStudio](https://forum.webostv.developer.lge.com/u/XRStudio)\
**Replies:** 1\
**Last updated:** [March 11, 2024, 8:30am UTC](https://forum.webostv.developer.lge.com/t/hosted-apps-and-the-motion-sensor-api/5917 "2024-03-11T08:30:14Z")

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Is it possible to work with the Motion Sensor API on Hosted Apps? So far I’ve been working with Spatial Nav and the portable WebTVOS.js. I’m trying to figure out what API’s are or are not available for Hosted Apps. I…

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## [Cannot press Channel Up/Down to trigger an event](https://forum.webostv.developer.lge.com/t/cannot-press-channel-up-down-to-trigger-an-event/18008)

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**Author:** [@user251](https://forum.webostv.developer.lge.com/u/user251)\
**Replies:** 1\
**Last updated:** [January 3, 2025, 12:03am UTC](https://forum.webostv.developer.lge.com/t/cannot-press-channel-up-down-to-trigger-an-event/18008 "2025-01-03T00:03:46Z")

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Hello everyone, I am currently having a problem developing an app that requires clicking on the Channel Up/Down button. I don’t know the exact key code of those two buttons, I have tried logging on the Simulator but it d…

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## [Get/set Current source in LG WebOS TV Programatically/API](https://forum.webostv.developer.lge.com/t/get-set-current-source-in-lg-webos-tv-programatically-api/16338)

<div class="topic-metadata">

**Author:** [@DigiLGDev](https://forum.webostv.developer.lge.com/u/DigiLGDev)\
**Replies:** 1\
**Last updated:** [December 24, 2024, 5:40am UTC](https://forum.webostv.developer.lge.com/t/get-set-current-source-in-lg-webos-tv-programatically-api/16338 "2024-12-24T05:40:29Z")

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Hi there, I’m looking for an API or any way in SDK to get and set the current source (input source like HDMI1, AV etc). It’s needed for my application. Can someone help me ? I went through the official documentation bu…

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## [HEVC support is lost](https://forum.webostv.developer.lge.com/t/hevc-support-is-lost/15084)

<div class="topic-metadata">

**Author:** [@Roberc](https://forum.webostv.developer.lge.com/u/Roberc)\
**Replies:** 1\
**Last updated:** [December 24, 2024, 5:33am UTC](https://forum.webostv.developer.lge.com/t/hevc-support-is-lost/15084 "2024-12-24T05:33:56Z")

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Hi Community, Does anybody noticed that a couple of days ago the support of HEVC videos is removed from the browser after the last OS update. Please share if not, and I will look into video streaming code. Anyway h264 …

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## [How can I open Youtube, Netflix,... app on my current app when I press something](https://forum.webostv.developer.lge.com/t/how-can-i-open-youtube-netflix-app-on-my-current-app-when-i-press-something/14098)

<div class="topic-metadata">

**Author:** [@user251](https://forum.webostv.developer.lge.com/u/user251)\
**Replies:** 1\
**Last updated:** [December 24, 2024, 5:13am UTC](https://forum.webostv.developer.lge.com/t/how-can-i-open-youtube-netflix-app-on-my-current-app-when-i-press-something/14098 "2024-12-24T05:13:25Z")

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I want to open an application like Youtube, Netflix or any application on my current application, how to do it? Can give me some documentation or a sample example? Hope to receive help, thank you very much

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