121 lines
3.4 KiB
TypeScript
121 lines
3.4 KiB
TypeScript
import deselectCurrent from './toggle-selection';
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interface Options {
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debug?: boolean;
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message?: string;
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format?: string; // MIME type
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onCopy?: (clipboardData: object) => void;
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}
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const clipboardToIE11Formatting = {
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'text/plain': 'Text',
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'text/html': 'Url',
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default: 'Text',
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};
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const defaultMessage = 'Copy to clipboard: #{key}, Enter';
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function format(message: string) {
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const copyKey = (/mac os x/i.test(navigator.userAgent) ? 'â' : 'Ctrl') + '+C';
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return message.replace(/#{\s*key\s*}/g, copyKey);
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}
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function copy(text: string, options?: Options): boolean {
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let message,
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reselectPrevious,
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range,
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selection,
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mark,
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success = false;
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if (!options) {
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options = {};
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}
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const debug = options.debug || false;
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try {
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reselectPrevious = deselectCurrent();
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range = document.createRange();
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selection = document.getSelection();
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mark = document.createElement('span');
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mark.textContent = text;
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// reset user styles for span element
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mark.style.all = 'unset';
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// prevents scrolling to the end of the page
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mark.style.position = 'fixed';
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mark.style.top = 0;
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mark.style.clip = 'rect(0, 0, 0, 0)';
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// used to preserve spaces and line breaks
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mark.style.whiteSpace = 'pre';
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// do not inherit user-select (it may be `none`)
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mark.style.webkitUserSelect = 'text';
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mark.style.MozUserSelect = 'text';
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mark.style.msUserSelect = 'text';
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mark.style.userSelect = 'text';
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mark.addEventListener('copy', function (e) {
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e.stopPropagation();
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if (options.format) {
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e.preventDefault();
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if (typeof e.clipboardData === 'undefined') {
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// IE 11
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debug && console.warn('unable to use e.clipboardData');
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debug && console.warn('trying IE specific stuff');
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(window as any).clipboardData.clearData();
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const format =
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clipboardToIE11Formatting[options.format] || clipboardToIE11Formatting['default'];
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(window as any).clipboardData.setData(format, text);
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} else {
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// all other browsers
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e.clipboardData.clearData();
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e.clipboardData.setData(options.format, text);
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}
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}
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if (options.onCopy) {
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e.preventDefault();
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options.onCopy(e.clipboardData);
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}
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});
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document.body.appendChild(mark);
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range.selectNodeContents(mark);
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selection.addRange(range);
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const successful = document.execCommand('copy');
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if (!successful) {
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throw new Error('copy command was unsuccessful');
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}
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success = true;
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} catch (err) {
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debug && console.error('unable to copy using execCommand: ', err);
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debug && console.warn('trying IE specific stuff');
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try {
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(window as any).clipboardData.setData(options.format || 'text', text);
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options.onCopy && options.onCopy((window as any).clipboardData);
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success = true;
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} catch (err) {
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debug && console.error('unable to copy using clipboardData: ', err);
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debug && console.error('falling back to prompt');
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message = format('message' in options ? options.message : defaultMessage);
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window.prompt(message, text);
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}
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} finally {
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if (selection) {
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if (typeof selection.removeRange == 'function') {
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selection.removeRange(range);
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} else {
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selection.removeAllRanges();
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}
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}
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if (mark) {
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document.body.removeChild(mark);
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}
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reselectPrevious();
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}
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return success;
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}
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export default copy;
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