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<title data-ice="title">src/modules/gridLayout.js | tablefilter</title>
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<div class="content" data-ice="content"><h1 data-ice="title">src/modules/gridLayout.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 {createElm, removeElm, elm, tag} from &apos;../dom&apos;;
import {addEvt, targetEvt} from &apos;../event&apos;;
import {contains} from &apos;../string&apos;;
import {NONE} from &apos;../const&apos;;
import {
defaultsBool, defaultsStr, defaultsNb, defaultsArr
} from &apos;../settings&apos;;
/**
* Grid layout, table with fixed headers
*/
export class GridLayout extends Feature {
/**
* Creates an instance of GridLayout
* @param {TableFilter} tf TableFilter instance
*/
constructor(tf) {
super(tf, &apos;gridLayout&apos;);
let f = this.config.grid_layout || {};
/**
* Grid-layout container width as CSS string
* @type {String}
*/
this.width = defaultsStr(f.width, null);
/**
* Grid-layout container height as CSS string
* @type {String}
*/
this.height = defaultsStr(f.height, null);
/**
* Css class for main container element
* @type {String}
*/
this.mainContCssClass = defaultsStr(f.cont_css_class, &apos;grd_Cont&apos;);
/**
* Css class for body table container element
* @type {String}
*/
this.contCssClass = defaultsStr(f.tbl_cont_css_class, &apos;grd_tblCont&apos;);
/**
* Css class for headers table container element
* @type {String}
*/
this.headContCssClass = defaultsStr(f.tbl_head_css_class,
&apos;grd_headTblCont&apos;);
/**
* Css class for toolbar container element (rows counter, paging etc.)
* @type {String}
*/
this.infDivCssClass = defaultsStr(f.inf_grid_css_class, &apos;grd_inf&apos;);
/**
* Index of the headers row, default: 0
* @type {Number}
*/
this.headRowIndex = defaultsNb(f.headers_row_index, 0);
/**
* Collection of the header row indexes to be moved into headers table
* @type {Array}
*/
this.headRows = defaultsArr(f.headers_rows, [0]);
/**
* Enable or disable column filters generation, default: true
* @type {Boolean}
*/
this.filters = defaultsBool(f.filters, true);
/**
* Enable or disable column headers, default: false
* @type {Boolean}
*/
this.noHeaders = Boolean(f.no_headers);
/**
* Grid-layout default column widht as CSS string
* @type {String}
*/
this.defaultColWidth = defaultsStr(f.default_col_width, &apos;100px&apos;);
/**
* List of column elements
* @type {Array}
* @private
*/
this.colElms = [];
/**
* Prefix for grid-layout filter&apos;s cell ID
* @type {String}
* @private
*/
this.prfxGridFltTd = &apos;_td_&apos;;
/**
* Prefix for grid-layout header&apos;s cell ID
* @type {String}
* @private
*/
this.prfxGridTh = &apos;tblHeadTh_&apos;;
/**
* Mark-up of original HTML table
* @type {String}
* @private
*/
this.sourceTblHtml = tf.dom().outerHTML;
/**
* Indicates if working table has column elements
* @type {Boolean}
* @private
*/
this.tblHasColTag = tag(tf.dom(), &apos;col&apos;).length &gt; 0 ? true : false;
/**
* Main container element
* @private
*/
this.tblMainCont = null;
/**
* Table container element
* @private
*/
this.tblCont = null;
/**
* Headers&apos; table container element
* @private
*/
this.headTblCont = null;
/**
* Headers&apos; table element
* @private
*/
this.headTbl = null;
// filters flag at TF level
tf.fltGrid = this.filters;
}
/**
* Generates a grid with fixed headers
* TODO: reduce size of init by extracting single purposed methods
*/
init() {
let tf = this.tf;
let tbl = tf.dom();
if (this.initialized) {
return;
}
// Override relevant TableFilter properties
this.setOverrides();
// Assign default column widths
this.setDefaultColWidths();
//Main container: it will contain all the elements
this.tblMainCont = this.createContainer(
&apos;div&apos;, this.mainContCssClass);
if (this.width) {
this.tblMainCont.style.width = this.width;
}
tbl.parentNode.insertBefore(this.tblMainCont, tbl);
//Table container: div wrapping content table
this.tblCont = this.createContainer(&apos;div&apos;, this.contCssClass);
this.setConfigWidth(this.tblCont);
if (this.height) {
this.tblCont.style.height = this.height;
}
tbl.parentNode.insertBefore(this.tblCont, tbl);
let t = removeElm(tbl);
this.tblCont.appendChild(t);
//In case table width is expressed in %
if (tbl.style.width === &apos;&apos;) {
let tblW = this.initialTableWidth();
tbl.style.width = (contains(&apos;%&apos;, tblW) ?
tbl.clientWidth : tblW) + &apos;px&apos;;
}
let d = removeElm(this.tblCont);
this.tblMainCont.appendChild(d);
//Headers table container: div wrapping headers table
this.headTblCont = this.createContainer(
&apos;div&apos;, this.headContCssClass);
//Headers table
this.headTbl = createElm(&apos;table&apos;);
let tH = createElm(&apos;tHead&apos;);
//1st row should be headers row, ids are added if not set
//Those ids are used by the sort feature
let hRow = tbl.rows[this.headRowIndex];
let sortTriggers = this.getSortTriggerIds(hRow);
//Filters row is created
let filtersRow = this.createFiltersRow();
//Headers row are moved from content table to headers table
this.setHeadersRow(tH);
this.headTbl.appendChild(tH);
if (tf.filtersRowIndex === 0) {
tH.insertBefore(filtersRow, hRow);
} else {
tH.appendChild(filtersRow);
}
this.headTblCont.appendChild(this.headTbl);
this.tblCont.parentNode.insertBefore(this.headTblCont, this.tblCont);
//THead needs to be removed in content table for sort feature
let thead = tag(tbl, &apos;thead&apos;);
if (thead.length &gt; 0) {
tbl.removeChild(thead[0]);
}
// ensure table layout is always set even if already set in css
// definitions, potentially with custom css class this could be lost
this.headTbl.style.tableLayout = &apos;fixed&apos;;
tbl.style.tableLayout = &apos;fixed&apos;;
//content table without headers needs col widths to be reset
tf.setColWidths(this.headTbl);
//Headers container width
this.headTbl.style.width = tbl.style.width;
//
//scroll synchronisation
addEvt(this.tblCont, &apos;scroll&apos;, (evt) =&gt; {
let elm = targetEvt(evt);
let scrollLeft = elm.scrollLeft;
this.headTblCont.scrollLeft = scrollLeft;
//New pointerX calc taking into account scrollLeft
// if(!o.isPointerXOverwritten){
// try{
// o.Evt.pointerX = function(evt){
// let e = evt || global.event;
// let bdScrollLeft = tf_StandardBody().scrollLeft +
// scrollLeft;
// return (e.pageX + scrollLeft) ||
// (e.clientX + bdScrollLeft);
// };
// o.isPointerXOverwritten = true;
// } catch(err) {
// o.isPointerXOverwritten = false;
// }
// }
});
// TODO: Trigger a custom event handled by sort extension
let sort = tf.extension(&apos;sort&apos;);
if (sort) {
sort.asyncSort = true;
sort.triggerIds = sortTriggers;
}
//Col elements are enough to keep column widths after sorting and
//filtering
this.setColumnElements();
if (tf.popupFilters) {
filtersRow.style.display = NONE;
}
/** @inherited */
this.initialized = true;
}
/**
* Overrides TableFilter instance properties to adjust to grid layout mode
* @private
*/
setOverrides() {
let tf = this.tf;
tf.refRow = 0;
tf.headersRow = 0;
tf.filtersRowIndex = 1;
}
/**
* Set grid-layout default column widths if column widths are not defined
* @private
*/
setDefaultColWidths() {
let tf = this.tf;
if (tf.colWidths.length &gt; 0) {
return;
}
tf.eachCol((k) =&gt; {
let colW;
let cell = tf.dom().rows[tf.getHeadersRowIndex()].cells[k];
if (cell.width !== &apos;&apos;) {
colW = cell.width;
} else if (cell.style.width !== &apos;&apos;) {
colW = parseInt(cell.style.width, 10);
} else {
colW = this.defaultColWidth;
}
tf.colWidths[k] = colW;
});
tf.setColWidths();
}
/**
* Initial table width
* @returns {Number}
* @private
*/
initialTableWidth() {
let tbl = this.tf.dom();
let width; //initial table width
if (tbl.width !== &apos;&apos;) {
width = tbl.width;
}
else if (tbl.style.width !== &apos;&apos;) {
width = tbl.style.width;
} else {
width = tbl.clientWidth;
}
return parseInt(width, 10);
}
/**
* Creates container element
* @param {String} tag Tag name
* @param {String} className Css class to assign to element
* @returns {DOMElement}
* @private
*/
createContainer(tag, className) {
let element = createElm(tag);
element.className = className;
return element;
}
/**
* Creates filters row with cells
* @returns {HTMLTableRowElement}
* @private
*/
createFiltersRow() {
let tf = this.tf;
let filtersRow = createElm(&apos;tr&apos;);
if (this.filters &amp;&amp; tf.fltGrid) {
tf.externalFltIds = [];
tf.eachCol((j) =&gt; {
let fltTdId = `${tf.prfxFlt + j + this.prfxGridFltTd + tf.id}`;
let cl = createElm(tf.fltCellTag, [&apos;id&apos;, fltTdId]);
filtersRow.appendChild(cl);
tf.externalFltIds[j] = fltTdId;
});
}
return filtersRow;
}
/**
* Generates column elements if necessary and assigns their widths
* @private
*/
setColumnElements() {
let tf = this.tf;
let cols = tag(tf.dom(), &apos;col&apos;);
this.tblHasColTag = cols.length &gt; 0;
for (let k = (tf.getCellsNb() - 1); k &gt;= 0; k--) {
let col;
if (!this.tblHasColTag) {
col = createElm(&apos;col&apos;);
tf.dom().insertBefore(col, tf.dom().firstChild);
} else {
col = cols[k];
}
col.style.width = tf.colWidths[k];
this.colElms[k] = col;
}
this.tblHasColTag = true;
}
/**
* Sets headers row in headers table
* @param {HTMLHeadElement} tableHead Table head element
* @private
*/
setHeadersRow(tableHead) {
if (this.noHeaders) {
// Handle table with no headers, assuming here headers do not
// exist
tableHead.appendChild(createElm(&apos;tr&apos;));
} else {
// Headers row are moved from content table to headers table
for (let i = 0; i &lt; this.headRows.length; i++) {
let row = this.tf.dom().rows[this.headRows[i]];
tableHead.appendChild(row);
}
}
}
/**
* Sets width defined in configuration to passed element
* @param {DOMElement} element DOM element
* @private
*/
setConfigWidth(element) {
if (!this.width) {
return;
}
if (this.width.indexOf(&apos;%&apos;) !== -1) {
element.style.width = &apos;100%&apos;;
} else {
element.style.width = this.width;
}
}
/**
* Returns a list of header IDs used for specifing external sort triggers
* @param {HTMLTableRowElement} row DOM row element
* @returns {Array} List of IDs
* @private
*/
getSortTriggerIds(row) {
let tf = this.tf;
let sortTriggers = [];
tf.eachCol((n) =&gt; {
let c = row.cells[n];
let thId = c.getAttribute(&apos;id&apos;);
if (!thId || thId === &apos;&apos;) {
thId = `${this.prfxGridTh + n}_${tf.id}`;
c.setAttribute(&apos;id&apos;, thId);
}
sortTriggers.push(thId);
});
return sortTriggers;
}
/**
* Removes the grid layout
*/
destroy() {
let tf = this.tf;
let tbl = tf.dom();
if (!this.initialized) {
return;
}
let t = removeElm(tbl);
this.tblMainCont.parentNode.insertBefore(t, this.tblMainCont);
removeElm(this.tblMainCont);
this.tblMainCont = null;
this.headTblCont = null;
this.headTbl = null;
this.tblCont = null;
tbl.outerHTML = this.sourceTblHtml;
//needed to keep reference of table element for future usage
this.tf.tbl = elm(tf.id);
this.initialized = false;
}
}
</code></pre>
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