Develop Reference

javascript highlight multiple rows

I have looked all over but can't find a good answer.
So what I'm wanting to do is highlight multiple rows on a table
Then if you click on a highlighted row it gets un-highlighted.
All of this works for me. The problem I'm having is when I un-highlight a row for some reason it won't highlight again.
function highlight_row() {
var table = document.getElementById("display-table");
var cells = table.getElementsByTagName('td');
for (var i = 0; i < cells.length; i++) {
var cell = cells[i];
cell.onclick = function () {
var rowId = this.parentNode.rowIndex;
var rowSelected = table.getElementsByTagName('tr')[rowId];
rowSelected.className += "selected";
$(cell).toggleClass('selected');
}
}
}
I have changed out $(cell) with $(this) and that works but only re highlighting the cell I click on and not the whole row.
I'm at a lose here.
Thanks

If you want to highlight the whole row, you need to get parent tr
cell.onclick = function () {
$(this).parent('tr').toggleClass('selected');
}

Jquery Data table Search Option is not enable sorting icon

I am stuck in jquery Data table. if we use jquery data table then it provide by default search option. But problem is that if i search particular record and if content is not match or i found single record. then i need to remove sorting icon. it will work but as i press back space and remove searching content then as usual it display all records. But now sortable icon is disable it needs to enabled once again then what is the solution for that.
This is function call:-
$('#datatable-information').on('draw.dt', function () {
disableSortingSearchOption(oTable, 'datatable-information_filter input');
This is Function Defination:-
function disableSortingSearchOption(oTables, tableClass) {
if (oTables != null) {
var rowCount = oTables.fnSettings().fnRecordsDisplay();
{
if (rowCount == 0 || rowCount == 1) {
var oSettings = oTables.fnSettings();
//Remove sort icon
$('.DataTables_sort_icon').remove();
//Remove hand cursor
$('.datatable th').css('cursor', 'default');
//Iterate through each column and disable sorting
$('.' + tableClass + ' th').each(function (index) {
if ((oSettings.aoColumns[index]) != undefined) {
oSettings.aoColumns[index].bSortable = false;
}
});
}
}
}
}

Here is a simple way to remove the sorting arrows on the table headers and change the pointer to default when the drawed table has 1 line or less.
On more than one line, the table sorting and the pointer comes back to "normal".
My solution is quite different than the code you provided.
function disableSortingSearchOption(oTables) {
if (oTables != null) {
var colCount = 0;
$(oTables).find('th').each(function(){
colCount++;
});
//console.log(colCount+" colunms");
var rowCount = 0;
$(oTables).find('td').each(function(){
rowCount++;
});
rowCount = rowCount/colCount;
//console.log(rowCount+" rows");
if (rowCount <= 1) {
//Remove hand cursor
$(oTables).find('th').css('cursor', 'default');
//Remove sort arrows
$(oTables).find('th').removeClass('sorting');
}else{
//Add hand cursor
$(oTables).find('th').css('cursor', 'pointer');
//Add sort arrows
$(oTables).find('th').addClass('sorting');
}
}
}
We need to know the row amount...
To achieve this, we first count the column amount and the whole table's td amount.
The row amount is the td amount divided by the column amount.
Based on this number, we can add or remove the sorting class on all th and set the cursor.
Note that when there is no result, there is still one line to show "No matching records found". But since there is only 1 td in this case... divided by the colunm count, we have to think about "one or less line".
;)
Have a look at this CodePen.

Select programmatically Kendo grid row

I found posts with similar titles but I still cannot resolve my issue. Definitely I am doing something wrong.
In Kendo grid configuration have some function which take context (grid) and read selected row:
change: function (e) {
refresh(this);
}
This is how I configured "change" event.
In function "refresh(grid)" I am getting selected row on following way:
refresh: function (grid) {
var selectedRows = grid.select();
var selectedRow = grid.dataItem(selectedRows[0]);
var id = selectedRow.Id;
}
This approach works perfect when I select grid row manually. But when I select row programatically "selectedRow" variable is null.
I am selecting programatically on following way:
var grid = $("#grid").data("kendoGrid");
var rows = grid.dataSource.data();
var row = rows[rows.length - 1];
grid.select(row);
As I sad in above, in previous "refresh(grid)" method variable selectedRow will be null.
Does anybody have some opinion about that? Why is it happened?
Thanks

According to the Grid documentation the "select" method accepts "string" parameter (selector) or jQuery element. That why if you need to correctly select the row you should modify your current code as follows:
var grid = $("#grid").data("kendoGrid");
//if you are using the "pageable" option of the grid
//you should get the visible rows using the .view() method
var models = grid.dataSource.data();
var model = models[models.length - 1];
var lastRowUid = model.uid;
//find the target row element:
var row = grid.table.find("[data-uid=" + lastRowUid + "]");
grid.select(row);

Creating a table of divs

I want to create a 16*16 table in html that holds div container in each cell. I'm not sure to what degree I'm allowed to mix jquery and pure javascript but what I have is
$( document ).ready(function() {
var table = Doucument.getElementById('table');
for (var i = 0; i <16; i++) {
var row = table.insertRow(i);
for(var j = 0; j < 16; j++){
row.insertCell(i);
}
};
});
This is adding a row to my table and then adding 16 cells. However I'm not sure how to add the div element to each cell. Perhaps theres a simpler way to do this with jquery? I'm not so proficient in jquery

Change "Document" to "document", remove the loop indexes (i, j) from the insertRow() and insertCell methods, and capture the newly inserted cell so that you can populate it. I've set each div's ID to be a combination of row and cell number in the example below.
I should also point out that there are better ways to do this. Tables should only be used for displaying data that requires tables. Also, this kind of thing would ideally be done on the server side unless there's a reason for you to do it in JavaScript.
That being said, here is a working example using JavaScript:
HTML:
<table id="myTable"></table>
JavaScript:
$(document).ready(function () {
var table = document.getElementById('myTable');
for (var i = 0; i < 16; i++) {
var row = table.insertRow();
for (var j = 0; j < 16; j++) {
var cell = row.insertCell();
var id = 'r' + i + 'c' + j;
cell.innerHTML = '<div id="' + id + '">' + id + '</div>';
}
};
});
CSS (after reading your comment about controlling size):
#myTable TD DIV {
height: 30px;
width: 30px;
}
Demo: http://jsfiddle.net/BenjaminRay/ugm613zg/

Do you have a specific reason to create a "table" - it is frowned upon by UX and CSS experts. It is considered a better approach to consider creating a table-like layout using Div/Spans and CSS. There are frameworks available that can provide you this layout style out of the box.
One of the most popular ones is Bootstrap's Grid - and here are some layout examples - http://getbootstrap.com/examples/grid/. The benefit of using this approach instead of tables is that your layout will adjust better to screen size changes like say viewing on a mobile device (called responsive layout).
In the interest of full disclosure Bootstrap supports 12 columns out of the box - but modifications are available for 16 and 24 columns - How to use bootstrap with 16 or 24 columns.
This is a longer route but a better solution than tables overall.

And using jQuery, you could do the following.
function addElems(ele, howMany, append) {
var $items = $();
for (var i = 0; i < howMany; i++) {
var $ele = $("<" + ele + "/>");
typeof append !== "undefined" && $ele.append(append);
$items = $items.add($ele);
}
return $items;
}
var $table = $("#myTable").append("<tbody></tbody>");
var $trs = addElems('tr', 16);
$table.append($trs);
$table.find("tbody > tr").each(function() {
var $tds = addElems('td', 16, "<div>My Div</div>");
$(this).append($tds);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id="myTable"></table>

Hide table column ondblclick

I have a table and I want to hide a column when I double click a column.
Code for hiding a column is practically all around Stack Overflow. All I need is a hint on how/where to add the ondblclick event so I can retrieve the identity of a <td> within a <table>.

Here are two solutions that should work. One done with jQuery and one with only standard Javascript.
http://jsfiddle.net/GNFN2/2/
// Iterate over each table, row and cell, and bind a click handler
// to each one, keeping track of which column each table cell was in.
var tables = document.getElementsByTagName('table');
for (var i = 0; i < tables.length; i++) {
var rows = tables[i].getElementsByTagName('tr');
for (var j = 0; j < rows.length; j++) {
var cells = rows[j].getElementsByTagName('td');
for (var k = 0; k < cells.length; k++) {
// Bind our handler, capturing the list of rows and colum.
cells[k].ondblclick = column_hide_handler(rows, k);
}
}
}
// Get a click handler function, keeping track of all rows and
// the column that this function should hide.
function column_hide_handler(rows, col) {
return function(e) {
// When the handler is triggered, hide the given column
// in each of the rows that were found previously.
for (var i = 0; i < rows.length; i++) {
var cells = rows[i].getElementsByTagName('td');
if (cells[col]) {
cells[col].style.display = 'none';
}
}
}
}
With jQuery it is much cleaner. This method also uses event bubbling, so you don't need to bind an event handler to each table cell individually.
http://jsfiddle.net/YCKZv/4/
// Bind a general click handler to the table that will trigger
// for all table cells that are clicked on.
$('table').on('dblclick', 'td', function() {
// Find the row that was clicked.
var col = $(this).closest('tr').children('td').index(this);
if (col !== -1) {
// Go through each row of the table and hide the clicked column.
$(this).closest('table').find('tr').each(function() {
$(this).find('td').eq(col).hide();
});
}
});

You can do this way:
<td ondblclick="this.style.display = 'none';">Some Stuff</td>
Here this refers to current td clicked.
Working Example
To go unobtrusive, you can do that easily using jQuery if you want:
$('#tableID td').dblclick(function(){
$(this).hide();
});

Due to lack of answears I came up with a workaround, which is a big ugly, but it works fine.
On the window load event I decided to iterate the table and set each 's onclick event to call my show_hide_column function with the column parameter set from the iteration.
window.onload = function () {
var headers = document.getElementsByTagName('th');
for (index in headers) {
headers[index].onclick = function (e) {
show_hide_column(index, false)
}
}
}
show_hide_column is a function that can be easily googled and the code is here:
function show_hide_column(col_no, do_show) {
var stl;
if (do_show) stl = 'table-cell'
else stl = 'none';
var tbl = document.getElementById('table_id');
var rows = tbl.getElementsByTagName('tr');
var headers = tbl.getElementsByTagName('th');
headers[col_no].style.display=stl;
for (var row=1; row<rows.length; row++) {
var cels = rows[row].getElementsByTagName('td')
cels[col_no].style.display=stl;
}
}
Note: my html only had one table so the code also assumes this. If you have more table you should tinker with it a little. Also it assumes the table has table headers ();
Also I noted this to be an ugly approach as I was expecting to be able to extract the index of a table cell from the table without having to iterate it on load.