2015-05-30 14:23:33 +02:00
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import Dom from '../dom';
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import Str from '../string';
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2014-12-13 10:04:25 +01:00
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export class HighlightKeyword{
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/**
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* HighlightKeyword, highlight matched keyword
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* @param {Object} tf TableFilter instance
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*/
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constructor(tf) {
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2015-02-21 04:39:09 +01:00
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var f = tf.config();
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2014-12-13 10:04:25 +01:00
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//defines css class for highlighting
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this.highlightCssClass = f.highlight_css_class || 'keyword';
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this.highlightedNodes = [];
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this.tf = tf;
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}
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/**
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* highlight occurences of searched term in passed node
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* @param {Node} node
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* @param {String} word Searched term
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* @param {String} cssClass Css class name
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*/
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highlight(node, word, cssClass){
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// Iterate into this nodes childNodes
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if(node.hasChildNodes){
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var children = node.childNodes;
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for(var i=0; i<children.length; i++){
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this.highlight(children[i], word, cssClass);
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}
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}
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if(node.nodeType === 3){
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var tempNodeVal = Str.lower(node.nodeValue);
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var tempWordVal = Str.lower(word);
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if(tempNodeVal.indexOf(tempWordVal) != -1){
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var pn = node.parentNode;
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if(pn && pn.className != cssClass){
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// word not highlighted yet
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var nv = node.nodeValue,
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ni = tempNodeVal.indexOf(tempWordVal),
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// Create a load of replacement nodes
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before = Dom.text(nv.substr(0, ni)),
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docWordVal = nv.substr(ni,word.length),
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after = Dom.text(nv.substr(ni+word.length)),
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hiwordtext = Dom.text(docWordVal),
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hiword = Dom.create('span');
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hiword.className = cssClass;
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hiword.appendChild(hiwordtext);
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pn.insertBefore(before,node);
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pn.insertBefore(hiword,node);
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pn.insertBefore(after,node);
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pn.removeChild(node);
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this.highlightedNodes.push(hiword.firstChild);
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}
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}
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}
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}
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/**
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* Removes highlight to nodes matching passed string
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* @param {String} word
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* @param {String} cssClass Css class to remove
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*/
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unhighlight(word, cssClass){
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var arrRemove = [];
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var highlightedNodes = this.highlightedNodes;
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for(var i=0; i<highlightedNodes.length; i++){
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var n = highlightedNodes[i];
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if(!n){
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continue;
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}
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var tempNodeVal = Str.lower(n.nodeValue),
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tempWordVal = Str.lower(word);
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if(tempNodeVal.indexOf(tempWordVal) !== -1){
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var pn = n.parentNode;
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if(pn && pn.className === cssClass){
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var prevSib = pn.previousSibling,
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nextSib = pn.nextSibling;
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if(!prevSib || !nextSib){ continue; }
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nextSib.nodeValue = prevSib.nodeValue + n.nodeValue +
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nextSib.nodeValue;
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prevSib.nodeValue = '';
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n.nodeValue = '';
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arrRemove.push(i);
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}
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}
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}
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for(var k=0; k<arrRemove.length; k++){
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highlightedNodes.splice(arrRemove[k], 1);
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}
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}
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/**
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* Clear all occurrences of highlighted nodes
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*/
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unhighlightAll(){
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if(!this.tf.highlightKeywords || !this.tf.searchArgs){
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return;
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}
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for(var y=0; y<this.tf.searchArgs.length; y++){
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this.unhighlight(
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this.tf.searchArgs[y], this.highlightCssClass);
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}
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this.highlightedNodes = [];
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}
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}
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