superset injectCustomCss 源码
superset injectCustomCss 代码
文件路径：/superset-frontend/src/dashboard/util/injectCustomCss.ts
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
function createStyleElement(className: string) {
const style = document.createElement('style');
style.className = className;
style.type = 'text/css';
return style;
}
// The original, non-typescript code referenced `style.styleSheet`.
// I can't find what sort of element would have a styleSheet property,
// so have created this type to satisfy TS without changing behavior.
type MysteryStyleElement = {
styleSheet: {
cssText: string;
};
};
export default function injectCustomCss(css: string) {
const className = 'CssEditor-css';
const head = document.head || document.getElementsByTagName('head')[0];
const style: HTMLStyleElement =
document.querySelector(`.${className}`) || createStyleElement(className);
if ('styleSheet' in style) {
(style as HTMLStyleElement & MysteryStyleElement).styleSheet.cssText = css;
} else {
style.innerHTML = css;
}
/**
* Ensures that the style applied is always the last.
*
* from: https://developer.mozilla.org/en-US/docs/Web/API/Node/appendChild
* The Node.appendChild() method adds a node to the end of the list of children
* of a specified parent node. If the given child is a reference to an existing
* node in the document, appendChild() moves it from its current position to the
* new position (there is no requirement to remove the node from its parent node
* before appending it to some other node).
*/
head.appendChild(style);
return function removeCustomCSS() {
style.remove();
};
}
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