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<title data-ice="title">src/modules/alternateRows.js | tablefilter</title>
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<div class="content" data-ice="content"><h1 data-ice="title">src/modules/alternateRows.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import {Feature} from &apos;../feature&apos;;
import {addClass, removeClass} from &apos;../dom&apos;;
import {defaultsStr} from &apos;../settings&apos;;
/**
* Rows with alternating background color for improved readability
*/
export class AlternateRows extends Feature {
/**
* Creates an instance of AlternateRows.
*
* @param {Object} tf TableFilter instance
*/
constructor(tf) {
super(tf, &apos;alternateRows&apos;);
let config = this.config;
/**
* Css class for even rows (default: &apos;even&apos;)
* @type {String}
*/
this.evenCss = defaultsStr(config.even_row_css_class, &apos;even&apos;);
/**
* Css class for odd rows (default: &apos;odd&apos;)
* @type {String}
*/
this.oddCss = defaultsStr(config.odd_row_css_class, &apos;odd&apos;);
}
/**
* Sets alternating rows color
*/
init() {
if (this.initialized) {
return;
}
this.processAll();
// Subscribe to events
this.emitter.on([&apos;row-processed&apos;, &apos;row-paged&apos;],
(tf, rowIndex, arrIndex, isValid) =&gt;
this.processRow(rowIndex, arrIndex, isValid));
this.emitter.on([&apos;column-sorted&apos;, &apos;rows-changed&apos;],
() =&gt; this.processAll());
/** @inherited */
this.initialized = true;
}
/**
* Apply background to all valid rows
*/
processAll() {
if (!this.isEnabled()) {
return;
}
let tf = this.tf;
let validRowsIndex = tf.getValidRows(true);
let indexLen = validRowsIndex.length;
let idx = 0;
//alternates bg color
for (let j = 0; j &lt; indexLen; j++) {
let rowIdx = validRowsIndex[j];
this.setRowBg(rowIdx, idx);
idx++;
}
}
/**
* Set/remove row background based on row validation
* @param {Number} rowIdx Row index
* @param {Number} arrIdx Array index
* @param {Boolean} isValid Valid row flag
*/
processRow(rowIdx, arrIdx, isValid) {
if (isValid) {
this.setRowBg(rowIdx, arrIdx);
} else {
this.removeRowBg(rowIdx);
}
}
/**
* Sets row background color
* @param {Number} rowIdx Row index
* @param {Number} idx Valid rows collection index needed to calculate bg
* color
* @private
*/
setRowBg(rowIdx, idx) {
if (!this.isEnabled() || isNaN(rowIdx)) {
return;
}
let rows = this.tf.dom().rows;
let i = isNaN(idx) ? rowIdx : idx;
this.removeRowBg(rowIdx);
addClass(rows[rowIdx], (i % 2) ? this.evenCss : this.oddCss);
}
/**
* Removes row background color
* @param {Number} idx Row index
* @private
*/
removeRowBg(idx) {
if (isNaN(idx)) {
return;
}
let rows = this.tf.dom().rows;
removeClass(rows[idx], this.oddCss);
removeClass(rows[idx], this.evenCss);
}
/**
* Removes all alternating backgrounds
*/
destroy() {
if (!this.initialized) {
return;
}
let eachRow = this.tf.eachRow(0);
eachRow((row, i) =&gt; this.removeRowBg(i));
// Unsubscribe to events
this.emitter.off([&apos;row-processed&apos;, &apos;row-paged&apos;],
(tf, rowIndex, arrIndex, isValid) =&gt;
this.processRow(rowIndex, arrIndex, isValid));
this.emitter.off([&apos;column-sorted&apos;, &apos;rows-changed&apos;],
() =&gt; this.processAll());
this.initialized = false;
}
}
</code></pre>
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