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Selection Context

Get the selected text along with text before and after the selection

当前为 2025-03-05 提交的版本，查看 最新版本。

此脚本不应直接安装，它是供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/528822/1547501/Selection%20Context.js 

  1. // ==UserScript==
  2. // @name         Selection Context
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.1.0
  5. // @description  Get the selected text along with text before and after the selection
  6. // @author       RoCry
  7. // @license MIT
  8. // ==/UserScript==
  9.  
  10. /**
  11.  * Gets the selected text along with text before and after the selection
  12.  * @returns {Object} Object containing selectedText, textBefore, and textAfter
  13.  */
  14. function GetSelectionContext() {
  15.   const selection = window.getSelection();
  16.   if (!selection || selection.rangeCount === 0 || selection.toString().trim() === '') {
  17.     return { selectedText: null, textBefore: null, textAfter: null, paragraphText: null };
  18.   }
  19.  
  20.   const selectedText = selection.toString().trim();
  21.   
  22.   // Get the range of the current selection
  23.   const range = selection.getRangeAt(0);
  24.   
  25.   // Get the paragraph containing the selection
  26.   let paragraphElement = range.commonAncestorContainer;
  27.  
  28.   // Navigate up to find a paragraph or meaningful content container
  29.   while (paragraphElement &&
  30.     (paragraphElement.nodeType !== Node.ELEMENT_NODE ||
  31.       !['P', 'DIV', 'ARTICLE', 'SECTION', 'LI'].includes(paragraphElement.tagName))) {
  32.     paragraphElement = paragraphElement.parentNode;
  33.   }
  34.  
  35.   // Get the paragraph text
  36.   let paragraphText = '';
  37.   if (paragraphElement) {
  38.     paragraphText = paragraphElement.textContent.trim();
  39.     if (paragraphText.length > 500) {
  40.       paragraphText = paragraphText.substring(0, 497) + '...';
  41.     }
  42.   }
  43.  
  44.   // Create ranges for text before and after selection
  45.   let textBefore = '';
  46.   let textAfter = '';
  47.  
  48.   try {
  49.     // Get text before selection
  50.     const beforeRange = range.cloneRange();
  51.     beforeRange.setStart(paragraphElement || document.body, 0);
  52.     beforeRange.setEnd(range.startContainer, range.startOffset);
  53.     textBefore = beforeRange.toString().trim();
  54.     
  55.     // Get text after selection
  56.     const afterRange = range.cloneRange();
  57.     afterRange.setStart(range.endContainer, range.endOffset);
  58.     afterRange.setEnd(paragraphElement || document.body, paragraphElement ? paragraphElement.childNodes.length : document.body.childNodes.length);
  59.     textAfter = afterRange.toString().trim();
  60.     
  61.     // Limit the length of before/after text to be reasonable
  62.     if (textBefore.length > 250) {
  63.       textBefore = '...' + textBefore.substring(textBefore.length - 250);
  64.     }
  65.     
  66.     if (textAfter.length > 250) {
  67.       textAfter = textAfter.substring(0, 250) + '...';
  68.     }
  69.   } catch (e) {
  70.     console.error('Error getting text before/after selection:', e);
  71.   }
  72.  
  73.   return { selectedText, textBefore, textAfter, paragraphText };
  74. }
  75.  
  76. // Export the function for use in other scripts
  77. if (typeof module !== 'undefined' && module.exports) {
  78.   module.exports = { GetSelectionContext };
  79. } else {
  80.   // For direct browser use
  81.   window.SelectionUtils = window.SelectionUtils || {};
  82.   window.SelectionUtils.GetSelectionContext = GetSelectionContext;
  83. }