Created
March 16, 2010 07:51
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| // Bookmarklet to calculate the most generic xpath for the current selection | |
| // (helper utility for scraping websites) | |
| function selectionxpath() { | |
| function calculateShortestXpathOfElement( sel ) { | |
| var node = sel; | |
| var nextId = null; | |
| var stop = null; | |
| var xpath = ""; | |
| //find next element with an id | |
| while (true) { | |
| if (node.id && node.id != "") { | |
| nextId = node.id; | |
| break; | |
| } | |
| node = node.parentNode; | |
| if (node == stop) break; | |
| } | |
| if (nextId != null) { | |
| xpath = "//" + node.tagName.toLowerCase() + "[@id='" + nextId + "']"; | |
| if ( node == sel ) { | |
| return xpath; | |
| } else { | |
| stop = node; | |
| } | |
| } | |
| //find next element with unique tag+class | |
| node = sel; | |
| var nextUniqueClass = null; | |
| while (true) { | |
| if (node.nodeType === 1) { | |
| var styleClass = node.getAttribute("class"); | |
| if (styleClass != null) { | |
| var tmpXpath = xpath+"//"+node.tagName+"[@class='"+styleClass+"']"; | |
| var tempResult = document.evaluate(tmpXpath, sel.ownerDocument, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null); | |
| if (tempResult.singleNodeValue == node) { | |
| nextUniqueClass = styleClass; | |
| break; | |
| } | |
| } | |
| } | |
| node = node.parentNode; | |
| if (node == stop) break; | |
| } | |
| if (nextUniqueClass != null) { | |
| xpath += "//"+node.tagName.toLowerCase()+"[@class='"+nextUniqueClass+"']"; | |
| if ( node == sel ) { | |
| return xpath; | |
| } else { | |
| stop = node; | |
| } | |
| } | |
| //find next element with unique tag | |
| node = sel; | |
| var nextUniqueTag = null; | |
| while (true) { | |
| if (node.nodeType === 1) { | |
| var tmpXpath = xpath+"//"+node.tagName; | |
| var tempResult = document.evaluate(tmpXpath, sel.ownerDocument, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null); | |
| if (tempResult.singleNodeValue == node) { | |
| nextUniqueTag = node.tagName; | |
| break; | |
| } | |
| } | |
| node = node.parentNode; | |
| if (node == stop) break; | |
| } | |
| if (nextUniqueTag != null) { | |
| xpath += "//"+node.tagName.toLowerCase(); | |
| if ( node == sel ) { | |
| return xpath; | |
| } else { | |
| stop = node; | |
| } | |
| } | |
| //get absolute path for the rest | |
| var restPath = ""; | |
| for (node = sel; node && node.nodeType == 1; node = node.parentNode) { | |
| if (node == stop) break; | |
| var idx = 1; | |
| for (var sib = node.previousSibling; sib ; sib = sib.previousSibling) { | |
| if(sib.nodeType == 1 && sib.tagName == node.tagName) idx++; | |
| } | |
| var xname = node.tagName.toLowerCase(); | |
| if (idx > 1) xname += "[" + idx + "]"; | |
| restPath = "/" + xname + restPath; | |
| } | |
| var result = xpath + restPath; | |
| return result; | |
| } | |
| function depthOf( el ) { | |
| i = 0; | |
| while (el) { | |
| el = el.parentNode; | |
| i++; | |
| } | |
| return i; | |
| } | |
| function calculateShortestXpathOfSelection() { | |
| var sel = window.getSelection().getRangeAt(0); | |
| if (!sel) return null; | |
| var start = sel.startContainer; | |
| var end = sel.endContainer; | |
| var i = depthOf( start ); | |
| var j = depthOf( end ); | |
| while (start != end && i != 0 && j != 0) { | |
| if (i > j) { | |
| start = start.parentNode; | |
| i--; | |
| } else { | |
| end = end.parentNode; | |
| j--; | |
| } | |
| } | |
| return calculateShortestXpathOfElement(start); | |
| } | |
| var xpath = calculateShortestXpathOfSelection(); | |
| var node = document.evaluate(xpath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue; | |
| var border = node.style.border; | |
| if (!border) border = ""; | |
| node.style.border = "2px dashed red"; | |
| if (xpath) { | |
| prompt("Most generic xpath for selection:", xpath); | |
| node.style.border = border; | |
| } else { | |
| alert("Could not determine generic xpath for selection"); | |
| } | |
| } | |
| selectionxpath(); |
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| <html><body><p><a href="javascript:function%20selectionxpath()%20{function%20calculateShortestXpathOfElement(%20sel%20)%20{var%20node%20=%20sel;var%20nextId%20=%20null;var%20stop%20=%20null;var%20xpath%20=%20%22%22;while%20(true)%20{if%20(node.id%20&&%20node.id%20!=%20%22%22)%20{nextId%20=%20node.id;break;}node%20=%20node.parentNode;if%20(node%20==%20stop)%20break;}if%20(nextId%20!=%20null)%20{xpath%20=%20%22//%22%20+%20node.tagName.toLowerCase()%20+%20%22[@id=%27%22%20+%20nextId%20+%20%22%27]%22;if%20(%20node%20==%20sel%20)%20{return%20xpath;}%20else%20{stop%20=%20node;}}node%20=%20sel;var%20nextUniqueClass%20=%20null;while%20(true)%20{if%20(node.nodeType%20===%201)%20{var%20styleClass%20=%20node.getAttribute(%22class%22);if%20(styleClass%20!=%20null)%20{var%20tmpXpath%20=%20xpath+%22//%22+node.tagName+%22[@class=%27%22+styleClass+%22%27]%22;var%20tempResult%20=%20document.evaluate(tmpXpath,%20sel.ownerDocument,%20null,%20XPathResult.FIRST_ORDERED_NODE_TYPE,%20null);if%20(tempResult.singleNodeValue%20==%20node)%20{nextUniqueClass%20=%20styleClass;break;}}}node%20=%20node.parentNode;if%20(node%20==%20stop)%20break;}if%20(nextUniqueClass%20!=%20null)%20{xpath%20+=%20%22//%22+node.tagName.toLowerCase()+%22[@class=%27%22+nextUniqueClass+%22%27]%22;if%20(%20node%20==%20sel%20)%20{return%20xpath;}%20else%20{stop%20=%20node;}}node%20=%20sel;var%20nextUniqueTag%20=%20null;while%20(true)%20{if%20(node.nodeType%20===%201)%20{var%20tmpXpath%20=%20xpath+%22//%22+node.tagName;var%20tempResult%20=%20document.evaluate(tmpXpath,%20sel.ownerDocument,%20null,%20XPathResult.FIRST_ORDERED_NODE_TYPE,%20null);if%20(tempResult.singleNodeValue%20==%20node)%20{nextUniqueTag%20=%20node.tagName;break;}}node%20=%20node.parentNode;if%20(node%20==%20stop)%20break;}if%20(nextUniqueTag%20!=%20null)%20{xpath%20+=%20%22//%22+node.tagName.toLowerCase();if%20(%20node%20==%20sel%20)%20{return%20xpath;}%20else%20{stop%20=%20node;}}var%20restPath%20=%20%22%22;for%20(node%20=%20sel;%20node%20&&%20node.nodeType%20==%201;%20node%20=%20node.parentNode)%20{if%20(node%20==%20stop)%20break;var%20idx%20=%201;for%20(var%20sib%20=%20node.previousSibling;%20sib%20;%20sib%20=%20sib.previousSibling)%20{if(sib.nodeType%20==%201%20&&%20sib.tagName%20==%20node.tagName)%20idx++;}var%20xname%20=%20node.tagName.toLowerCase();if%20(idx%20>%201)%20xname%20+=%20%22[%22%20+%20idx%20+%20%22]%22;restPath%20=%20%22/%22%20+%20xname%20+%20restPath;}var%20result%20=%20xpath%20+%20restPath;return%20result;}function%20depthOf(%20el%20)%20{i%20=%200;while%20(el)%20{el%20=%20el.parentNode;i++;}return%20i;}function%20calculateShortestXpathOfSelection()%20{var%20sel%20=%20window.getSelection().getRangeAt(0);if%20(!sel)%20return%20null;var%20start%20=%20sel.startContainer;var%20end%20=%20sel.endContainer;var%20i%20=%20depthOf(%20start%20);var%20j%20=%20depthOf(%20end%20);while%20(start%20!=%20end%20&&%20i%20!=%200%20&&%20j%20!=%200)%20{if%20(i%20>%20j)%20{start%20=%20start.parentNode;i--;}%20else%20{end%20=%20end.parentNode;j--;}}return%20calculateShortestXpathOfElement(start);}var%20xpath%20=%20calculateShortestXpathOfSelection();var%20node%20=%20document.evaluate(xpath,%20document,%20null,%20XPathResult.FIRST_ORDERED_NODE_TYPE,%20null).singleNodeValue;var%20border%20=%20node.style.border;if%20(!border)%20border%20=%20%22%22;node.style.border%20=%20%222px%20dashed%20red%22;if%20(xpath)%20{prompt(%22Most%20generic%20xpath%20for%20selection:%22,%20xpath);node.style.border%20=%20border;}%20else%20{alert(%22Could%20not%20determine%20generic%20xpath%20for%20selection%22);}}selectionxpath();">Selection XPath</a></p><p/><p>Drag the link to you bookmark bar</p></body></html> |
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