116 lines
3.3 KiB
JavaScript
Executable File
116 lines
3.3 KiB
JavaScript
Executable File
"use strict";
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var deselectCurrent = require("toggle-selection");
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var 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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var defaultMessage = "Copy to clipboard: #{key}, Enter";
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function format(message) {
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var copyKey = (/mac os x/i.test(navigator.userAgent) ? "⌘" : "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, options) {
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var debug,
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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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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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// avoid screen readers from reading out loud the text
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mark.ariaHidden = "true"
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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") { // 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.clipboardData.clearData();
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var format = clipboardToIE11Formatting[options.format] || clipboardToIE11Formatting["default"]
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window.clipboardData.setData(format, text);
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} else { // 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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var 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.clipboardData.setData(options.format || "text", text);
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options.onCopy && options.onCopy(window.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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module.exports = copy;
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