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<script type="text/javascript">
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Robin Winslow | http://www.robinwinslow.me.uk */
// Find and select all text in the document that matches the "value" of the element passed
// If no element if passed, it will attempt to use the value of "this"
// Only works in a browser that supports the "window.getSelection" method, as other selection methods don't support multiple selectionsz
function performMultiSearch(elem,searchElem) {
// set up variables
var searchString; // Will hold the text to search for
var theSelection; // Will hold the document's selection object
var textNodes; // Will hold all the text nodes in the document
// Set it to search the entire document if we haven't been given an element to search
if(!searchElem || typeof(searchElem) == 'undefined') searchElem = document.body;
// Get the string to search for
if(elem && elem.value) searchString = elem.value;
else if(this && this.value) searchString = this.value;
// Get all the text nodes in the document
textNodes = findTypeNodes(searchElem,3);
// Get the selection object
if(window.getSelection) theSelection = window.getSelection(); // firefox
else { // some other browser - doesn't support multiple selections at once
alert("sorry this searching method isn't supported by your browser");
return;
}
// Empty the selection
theSelection.removeAllRanges(); // We want to empty the selection regardless of whether we're selecting anything
if(searchString.length > 0) { // make sure the string isn't empty, or it'll crash.
// Search all text nodes
for(var i = 0; i < textNodes.length; i++) {
// Create a regular expression object to do the searching
var reSearch = new RegExp(searchString,'gmi'); // Set it to 'g' - global (finds all instances), 'm' - multiline (searches more than one line), 'i' - case insensitive
var stringToSearch = textNodes[i].textContent;
while(reSearch(stringToSearch)) { // While there are occurrences of the searchString
// Add the new selection range
var thisRange = document.createRange();
thisRange.setStart(textNodes[i],reSearch.lastIndex - searchString.length); // Start node and index of the selection range
thisRange.setEnd(textNodes[i],reSearch.lastIndex); // End node and index of the selection
theSelection.addRange(thisRange); // Add the node to the document's current selection
}
}
}
return;
}
// Will find and select the first instance of the value of the passed element, then when called again will moves on to the next instance
// If no element passed it will try to get the value from "this"
function performSingleSearch(elem,searchElem) {
// set up variables
var searchString; // Will hold the text to search for
var theSelection; // Will hold the document's selection object
var textNodes; // Will hold all the text nodes in the document
// Set it to search the entire document if we haven't been given an element to search
if(!searchElem || typeof(searchElem) == 'undefined') searchElem = document.body;
// Get the string to search for
if(elem && elem.value) searchString = elem.value;
else if(this && this.value) searchString = this.value;
if(searchString && searchString.length > 0) { // make sure the string isn't empty, or it'll crash.
if(window.getSelection) { // Firefox
// Get the selection
theSelection = window.getSelection();
// Get all the text nodes in the document
textNodes = findTypeNodes(searchElem,3);
// If there's already a selection, and it's the string we're searching for
var searchMatch = new RegExp(searchString,'i');
if(theSelection.rangeCount == 1 && searchMatch(theSelection.getRangeAt(0).toString())) {
var currentRange = theSelection.getRangeAt(0);
theSelection.removeAllRanges();
// Move on to the next occurrence of it by iterating through text nodes...:
for(var i = 0; i < textNodes.length; i++) {
// If this text node is before the currentRange, ignore it and carry on to the next one
if(currentRange.comparePoint(textNodes[i],0) == -1 && currentRange.startContainer != textNodes[i]) continue;
// If this text node is the same as the currentRange, find the point in the currentRange
else if((currentRange.comparePoint(textNodes[i],0) == -1 && currentRange.startContainer == textNodes[i]) || (currentRange.comparePoint(textNodes[i],0) == 0)) {
// Create a regular expression object to do the searching
var reSearch = new RegExp(searchString,'gmi'); // Set it to 'g' - global (finds all instances), 'm' - multiline (searches more than one line), 'i' - case insensitive
var stringToSearch = textNodes[i].textContent;
var newRange = null;
while(reSearch(stringToSearch)) { // While there are occurrences of the searchString
// Test if the index is after the currentRange's position
if(reSearch.lastIndex - searchString.length > currentRange.startOffset) {
// This is the new search position - empty the old selection and add the new selection range
theSelection.removeAllRanges();
newRange = document.createRange();
newRange.setStart(textNodes[i],reSearch.lastIndex - searchString.length); // Start node and index of the selection range
newRange.setEnd(textNodes[i],reSearch.lastIndex); // End node and index of the selection
theSelection.addRange(newRange); // Add the node to the document's current selection
break; // We're not interested in the other results, so break out of this while loop.
}
}
if(newRange) break; // If we found a new range, break out of this for loop, cos there's nothing more to do.
else continue; // Otherwise continue
}
// If this text node is after the current one, search to see if it has any occurrences of the searchString
else if(currentRange.comparePoint(textNodes[i],0) == 1) {
// Create a regular expression object to do the searching
var reSearch = new RegExp(searchString,'gmi'); // Set it to 'g' - global (finds all instances), 'm' - multiline (searches more than one line), 'i' - case insensitive
var stringToSearch = textNodes[i].textContent;
// If we had a find, use it
if(reSearch(stringToSearch)) {
// This is the new search position - empty the old selection and add the new selection range
theSelection.removeAllRanges();
newRange = document.createRange();
newRange.setStart(textNodes[i],reSearch.lastIndex - searchString.length); // Start node and index of the selection range
newRange.setEnd(textNodes[i],reSearch.lastIndex); // End node and index of the selection
theSelection.addRange(newRange); // Add the node to the document's current selection
break; // We're not interested in the other results, so break out of this while loop.
} else continue;
}
}
}
// If we don't already have a selection, just find the first instance
else {
// Search all text nodes
for(var i = 0; i < textNodes.length; i++) {
// Create a regular expression object to do the searching
var reSearch = new RegExp(searchString,'gmi'); // Set it to 'g' - global (finds all instances), 'm' - multiline (searches more than one line), 'i' - case insensitive
var stringToSearch = textNodes[i].textContent;
if(reSearch(stringToSearch)) { // If there are occurrences of the searchString
// This is the new search position - empty the old selection and add the new selection range
theSelection.removeAllRanges();
// Add the new selection range
var thisRange = document.createRange();
thisRange.setStart(textNodes[i],reSearch.lastIndex - searchString.length); // Start node and index of the selection range
thisRange.setEnd(textNodes[i],reSearch.lastIndex); // End node and index of the selection
theSelection.addRange(thisRange); // Add the node to the document's current selection
break; // We're done
}
}
}
}
else if(document.selection) { // Internet Explorer
theSelection = document.selection;
var currentRange = theSelection.createRange();
// Empty the current selection
theSelection.empty();
if(currentRange && currentRange.text && currentRange.text.match(eval('/'+searchString+'/i'))) {
// Move start position of range past this word
currentRange.moveStart('word');
// Move end position to end of document
currentRange.moveEnd('textEdit');
// Search again
if(currentRange.findText(searchString)) {
// Select
currentRange.select();
return true;
}
return false;
} else {
// Get a new range
var searchRange = document.body.createTextRange();
// Make it encompass the whole document
searchRange.expand('textedit');
// Find the first occurrence of the searchString
if(searchRange.findText(searchString)) {
// Select
searchRange.select();
return true;
} else {
return false;
}
}
} else alert("Sorry your browser doesn't support a supported selection object");
}
}
// Recursively find all text nodes within an element
function findTypeNodes(elem,type) {
// Remove superfluous text nodes and merge adjacent text nodes
elem.normalize();
var typeNodes = new Array();
// Search all children of this element to see which ones are the right type of node
for(var nodeI = 0; nodeI < elem.childNodes.length; nodeI++) {
if(elem.childNodes[nodeI].nodeType == type) typeNodes.push(elem.childNodes[nodeI]); // If it is a the right type of node, add it to the array
else {
// If not a the right type of node, search it in turn
typeNodes = typeNodes.concat(findTypeNodes(elem.childNodes[nodeI],type));
}
}
return typeNodes; // return the array
}
// Multiple onload function created by: Simon Willison
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
if (oldonload) {
oldonload();
}
func();
}
}
}
addLoadEvent(function() {
// Create a button
var theInput = document.getElementById('searchInput');
var theButton = document.getElementById('performSearch');
var elementToSearch = document.body; // Use getElementById('yourIDName') to only allow search for a specific id.
theButton.onclick = function() { // Set the onclick function
performSingleSearch(theInput,elementToSearch);
}
});
</script>
<fieldset style="width: 240px;">
<legend>Search the page</legend>
<input type="text" id="searchInput"><button id="performSearch">search</button>
</fieldset>


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