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:tada: A helper function to easily modify Shadow DOM CSS.

Home Page: https://www.npmjs.com/package/shadow-dom-inject-styles

License: MIT License

JavaScript 58.12% TypeScript 41.88%

shadow-dom css ionic4 stenciljs web-components

shadow-dom-inject-styles's Introduction

Shadow-DOM-inject-styles

A helper function to easily modify Shadow DOM CSS.

Install

npm install shadow-dom-inject-styles --save

Vanilla JS Example / Demo

jsfiddle

<script type="module">
  import {injectStyles} from 'https://unpkg.com/shadow-dom-inject-styles@latest/dist/index.js';

  setTimeout(() => {

    const toolbar = document.querySelector('ion-app > ion-header > ion-toolbar');

    // language=CSS
    const styles = `
        .toolbar-background {
            background: red !important;
        }
        .toolbar-container {
            color: #fff !important;
        }
    `;

    injectStyles(toolbar, '.toolbar-background', styles);

  }, 200);
</script>

Typescript Example

import {injectStyles} from 'shadow-dom-inject-styles';

const toolbar = (this.el.querySelector('ion-header > ion-toolbar') as HTMLElement);

// language=CSS
const styles = `
  .toolbar-background {
    background: red !important;;
  }
`;

injectStyles(toolbar, '.toolbar-background', styles);

shadow-dom-inject-styles's People

Contributors

Stargazers

Watchers

Forkers

ghenry22 ionic4-toolbox avxkim xiaoyu86 amilamen tonn franciraldo ld07080304131

shadow-dom-inject-styles's Issues

Style not injected when no existing style element present in shadow DOM

  const root = shadowRootElement.shadowRoot;
  let styleAlreadyAdded = false;
  const currentStyleTags = Array.from(root.querySelectorAll('style'));
  currentStyleTags.forEach((element: HTMLStyleElement, index) => {
    if (element.innerHTML === styles) {
      styleAlreadyAdded = true;
    }
    if (currentStyleTags.length - 1 === index && styleAlreadyAdded === false) {
      const newStyleTag = document.createElement('style');
      newStyleTag.innerHTML = styles;
      root.insertBefore(newStyleTag, root.querySelector(insertBeforeSelector));
    }
  });

If there are no style elements already within the shadow DOM, currentStyleTags will be an empty array and the code path that conditionally injects the new styles never executes.

big bug

there is a bug: if there isn't any <style> tag in the shadowRootElement, this function can't work, because it use forEach of style tag elements.

Typescript example for multi DOM object

Maybe someone need this:

[].forEach.call(document.querySelectorAll('ion-button'), function(div) {
      const styles = `
      button {
        background: red !important;
      }
      `;
      injectStyles(div, 'button', styles);
    });

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Starting ChromeDriver 90.0.4430.24 (4c6d850f087da467d926e8eddb76550aed655991-refs/branch-heads/4430@{#429}) on port 16826
Only local connections are allowed.
Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
ChromeDriver was started successfully.
May 27, 2021 2:39:18 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: W3C
May 27, 2021 2:39:18 PM org.openqa.selenium.devtools.CdpVersionFinder findNearestMatch
WARNING: Unable to find an exact match for CDP version 90, so returning the closest version found: 86
May 27, 2021 2:39:18 PM org.openqa.selenium.devtools.CdpVersionFinder findNearestMatch
INFO: Found CDP implementation for version 90 of 86
Exception in thread "main" org.openqa.selenium.JavascriptException: javascript error: Cannot read property 'shadowRoot' of null
(Session info: chrome=90.0.4430.212)
Build info: version: '4.0.0-alpha-7', revision: 'de8579b6d5'
System info: host: 'LAPTOP-OT58K9N8', ip: '192.168.1.101', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '15.0.2'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 90.0.4430.212, chrome: {chromedriverVersion: 90.0.4430.24 (4c6d850f087da..., userDataDir: C:\Users\SRIKAN~1\AppData\L...}, goog:chromeOptions: {debuggerAddress: localhost:58595}, javascriptEnabled: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: WINDOWS, platformName: WINDOWS, proxy: Proxy(), setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:extension:largeBlob: true, webauthn:virtualAuthenticators: true}
Session ID: c9d0c3a102710fe4b62167e0861c02be
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:196)
at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:129)
at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:53)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:167)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:123)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:501)
at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:436)
at order.Shadowdom.main(Shadowdom.java:22)

TypeError: Cannot read property 'shadowRoot' of null

I used shadow-DOM-inject-styles as follow:
constructor(private el: ElementRef) {
const tabbar = this.el.nativeElement.querySelector('ion-tabs > ion-tabbar') as HTMLElement;
const styles = .tabbar-background { background: red !important;; };
injectStyles(tabbar, '.tabbar-background', styles);
}
but i got an error as below:
TypeError: Cannot read property 'shadowRoot' of null

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