Highlight Text By Page User

Dec 11, 2010

I'm working on an educational website for reading strategies where I would like to have the possibilty for the user to highlight text and the possibilty to check their highlighted answers.User task: Mark all the cause and effect connectors (because, so, therefore etc) in the text.Now I want the user to take the mouse and go over the text and mark all these connectors in the text. After marking the entire text the user will get feedback for his correct and incorrect answers and a possibilty to correct his mistakes.If the user marks in the sentence "He got hurt, because he fell of his bike." the word 'because' I would like somewhere else on the page be written that he did this correctly. If he would mark the word 'hurt' I would like the user to get a feedback saying that this answer is incorrect.Is this possible with simple html or do I need something else. If I need something else what do I need and maybe there is already a ready to use script for this.

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Inline Text Highlighting - User To Be Able To Select The Text They Want To Highlight

Sep 10, 2010

Alright, I'm using a Rooh.It WordPress plugin right now, but I don't like the way they do it, so I want to write my own code to do something similar.

I want the user to be able to select the text they want to highlight, and the background color of that text changes to whatever color they have selected.

How can I do this in JavaScript?

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Gecko Find/Highlight Text In Page

Jul 9, 2002

People have complained that window.find() doesn't work, and everyone knows Gecko doesn't support IE's proprietary TextRange object, some have assumed you can't do this in Gecko.

On the contrary though:


Node.prototype.findTextMatches = [];

Node.prototype.findText = function(query, ignoreCase) {
this.findTextMatches.length = 0;
if (ignoreCase)
query = query.toLowerCase();

var tw = this.ownerDocument.createTreeWalker(this, NodeFilter.SHOW_TEXT, { acceptNode: function(node) {return NodeFilter['FILTER_' + (RegExp(query, (ignoreCase ? 'i' : '')).test(node.nodeValue) ? 'ACCEPT' : 'REJECT')] } }, true);
var offsets = [];
offsets[-1] = query.length * -1;
var totalMatches, trueOffsetDiff;
var range = this.ownerDocument.createRange();

while (tw.nextNode()) {
totalMatches = tw.currentNode.nodeValue.split(RegExp(query, (ignoreCase ? 'i' : ''))).length - 1;
for (var i = 0; i < totalMatches; i++) {
trueOffsetDiff = offsets[offsets.length - 1] + query.length;
offsets[offsets.length] = tw.currentNode.nodeValue.substr(trueOffsetDiff)[ignoreCase ? 'toLowerCase' : 'toString']().indexOf(query) + trueOffsetDiff;

range.selectNode(tw.currentNode);
range.setStart(tw.currentNode, offsets[offsets.length - 1]);
range.setEnd(tw.currentNode, range.startOffset + query.length);
this.findTextMatches[this.findTextMatches.length] = range.cloneRange();
}
offsets.length = 0;
}
return (tw.currentNode != this);
}

Node.prototype.highlightText = function() {
if (this.findTextMatches.length > 0) {
with (window.getSelection()) {
removeAllRanges();
addRange(this.findTextMatches.shift());
}
return true;
}
else
return false;
}


To search all text in the body, ignoring case, you'd go like:

document.body.findText('search query', true);

That loads up an array full of ranges selecting the text into document.body.findTextMatches.

To selectively highlight next occurences after executing findText:

document.body.highlightText();
// highlights first occurence

document.body.highlightText();
// removes previous selection, highlights second occurrence

// etc

Just calling that method over and over will successfully highlight instances. It returns true if it highlighted something, false otherwise,

Also, since I prototyped Node, it works not just in HTML documents, but can work in XML documents too.

Calling document.findText in an HTMLDocument may cause interesting results, as it searches through all the nodes, including <head>...

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Here's a sample form:

Code:
<form action="#" method="post">
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[code]...

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Here's a sample form:

Code:
<form action="#" method="post">
Name:<br />
<input type="text" name="name" value="your name" /><br />

[Code].....

When you tab to a text input, the value gets highlighted. How can it be disabled?

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Here's a sample form:

<form action="#" method="post">
Name:<br />
<input type="text" name="name" value="your name" /><br />

[code]....

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onload="storeCaret(this);"

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Jul 23, 2005

Is it possible, using Javascript, to highlight (in yellow..) all the occurrences of "number: [0-9]+" (regex) of the document?

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[Code]...

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[code].....

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<!--//
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