How to remeber clicked buttons after page refresh with javascript?

How to remeber clicked buttons after page refresh with javascript? - javascript

Following code used to highlight table record when the checkbox is clicked. But once I refresh the page highlighted records disappear.How can I remain same highlighted record even after page refresh?
<style>
.highlight {
background-color: yellow;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#Table input").click(function() {
if ($(this).is(":checked")) {
$(this).parent().parent().addClass("highlight");
} else {
$(this).parent().parent().removeClass("highlight");
}
});
});
</script>
<body>
<div class="col-lg-10">
<form name="f">
<table id="Table" border="1"><tr>
<td><input type="checkbox" name="cb1" id="cb1" value="y" /></td>
<td>Click me</td>
</tr><tr>
<td><input type="checkbox" name="cb2" id="cb2" value="y" /></td>
<td>Click me</td>
</tr><tr>
<td><input type="checkbox" name="cb3" id="cb3" value="y" /></td>
<td>Click me</td>
</tr></table>
</div>

You will have to save the state somewhere, either in the url as a query string or you could use the browser localStorage. Then when the page loads, check that state and highlight accordingly.
Try something like this:
$("#Table input").click(function() {
if ($(this).is(":checked")) {
if(!localStorage.checked) {
localStorage.checked = [];
}
localStorage.checked.push($(this));
$(this).parent().parent().addClass("highlight");
} else {
for (var i = 0;i < localStorage.checked.length; i++) {
var itemAtIndex = localStorage.checked[i];
if(itemAtIndex == $(this)){
localStorage.splice(i, 1);
}
}
$(this).parent().parent().removeClass("highlight");
}
});
//on page load
for (var i = 0;i < localStorage.checked.length; i++) {
var itemAtIndex = localStorage.checked[i];
itemAtIndex.parent().parent().addClass("highlight");
}

The idea written in the answer of stackoverfloweth was correct however his code indeed did not work.
Heres your example using localStorage that does work (wont work in preview window here but will if you try it locally):
<style>
.highlight {
background-color: yellow;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
Array.prototype.remove = function() {
var what, a = arguments, L = a.length, ax;
while (L && this.length) {
what = a[--L];
while ((ax = this.indexOf(what)) !== -1) {
this.splice(ax, 1);
}
}
return this;
};
var checked = [];
$(document).ready(function() {
if (localStorage.getItem("checked") == null)
localStorage.setItem("checked", checked);
$("#Table input").click(function() {
if ($(this).is(":checked")) {
$(this).parent().parent().addClass("highlight");
checked.push($(this).attr("id"));
} else {
$(this).parent().parent().removeClass("highlight");
checked.remove($(this).attr("id"));
}
localStorage.setItem("checked", JSON.stringify(checked));
});
var saved = JSON.parse(localStorage.getItem("checked"));
for (var i = 0;i < saved.length; i++) {
var itemAtIndex = $("#" + saved[i] + "");
itemAtIndex.click();
itemAtIndex.parent().parent().addClass("highlight");
}
});
</script>
<body>
<div class="col-lg-10">
<form name="f">
<table id="Table" border="1"><tr>
<td><input type="checkbox" name="cb1" id="cb1" value="y" /></td>
<td>Click me</td>
</tr><tr>
<td><input type="checkbox" name="cb2" id="cb2" value="y" /></td>
<td>Click me</td>
</tr><tr>
<td><input type="checkbox" name="cb3" id="cb3" value="y" /></td>
<td>Click me</td>
</tr></table>
</div>

Related

Button not being enabled after click on checkboxes

So, I have created a table with checkboxes and I want the user to check at least two options in order to enable the button to submit the answers.
HTML
<body>
<h1>Checked two options</h1>
<br />
<p>What are some of your favorite dishes?</p>
<table id="tblFoods">
<tr>
<td><input id="chkPizza" type="checkbox" /><label for="chkPizza">Pizza</label></td>
</tr>
<tr>
<td><input id="chkLasagna" type="checkbox" /><label for="chkLasagna">Lasagna</label></td>
</tr>
<tr>
<td><input id="chkPasta" type="checkbox" /><label for="chkPasta">Pasta</label></td>
</tr>
<tr>
<td><input id="chkBarbecue" type="checkbox" /><label for="chkBarbecue">Barbecue</label></td>
</tr>
</table>
<br />
<input type="submit" id="mybtn" disabled value="Submit" onclick="EnableButton()" />
</body>
And I have this function, but it's not working. I'm using a looping to count how many options have been checked by the user, but it doesn't work.
JS
function EnableButton() {
var tblFoods = document.getElementById("tblFoods");
var checkeds = tblFoods.getElementsByTagName("INPUT");
var counter = 0;
for (let i = 0; i < marcados.length; i++) {
if (checkeds[i].checked) {
counter++;
}
}
if (counter >= 2) {
document.getElementById("mybtn").disabled = false;
} else {
document.getElementById("mybtn").disabled = true;
}
}
What am I doing wrong?

You need to check for whether the button needs to be enabled when the inputs get checked, not when the button gets clicked.
The nicest, most concise way to do this is:
const table = document.querySelector('#tblFoods');
table.addEventListener('change', () => {
const checkedCount = [...table.querySelectorAll('input')].reduce((a, input) => a + input.checked, 0);
document.getElementById("mybtn").disabled = checkedCount < 2;
});
<h1>Checked two options</h1>
<br/>
<p>What are some of your favorite dishes?</p>
<table id="tblFoods">
<tr>
<td><input id="chkPizza" type="checkbox" /><label for="chkPizza">Pizza</label></td>
</tr>
<tr>
<td><input id="chkLasagna" type="checkbox" /><label for="chkLasagna">Lasagna</label></td>
</tr>
<tr>
<td><input id="chkPasta" type="checkbox" /><label for="chkPasta">Pasta</label></td>
</tr>
<tr>
<td><input id="chkBarbecue" type="checkbox" /><label for="chkBarbecue">Barbecue</label></td>
</tr>
</table>
<br />
<input type="submit" id="mybtn" disabled value="Submit" />
Your original code, tweaked, works too, but is pretty verbose in comparison.
document.querySelector('#tblFoods').addEventListener('change', () => {
var tblFoods = document.getElementById("tblFoods");
var checkeds = tblFoods.getElementsByTagName("INPUT");
var counter = 0;
for(let i =0; i < checkeds.length;i++)
{
if(checkeds[i].checked)
{
counter++;
}
}
if(counter>=2)
{
document.getElementById("mybtn").disabled = false;
}
else
{
document.getElementById("mybtn").disabled = true;
}
});
<h1>Checked two options</h1>
<br/>
<p>What are some of your favorite dishes?</p>
<table id="tblFoods">
<tr>
<td><input id="chkPizza" type="checkbox" /><label for="chkPizza">Pizza</label></td>
</tr>
<tr>
<td><input id="chkLasagna" type="checkbox" /><label for="chkLasagna">Lasagna</label></td>
</tr>
<tr>
<td><input id="chkPasta" type="checkbox" /><label for="chkPasta">Pasta</label></td>
</tr>
<tr>
<td><input id="chkBarbecue" type="checkbox" /><label for="chkBarbecue">Barbecue</label></td>
</tr>
</table>
<br />
<input type="submit" id="mybtn" disabled value="Submit" />

You have to handle the changes on each checkbox element separately and finally, the submit button. You can do something like the below.
Note: See how the onClick event handlers are used on each input type checkbox element and on the submit button separately. Also, we have to reset everything when submitting.
A possible solution:
let checks_counter = 0;
function EnableButton(checkbox) {
if (checkbox.checked) {
checks_counter++;
}
if (checks_counter > 2) {
document.getElementById("mybtn").disabled = false;
} else {
document.getElementById("mybtn").disabled = true;
}
}
function submitHandler() {
var elements = document.getElementsByTagName('input');
//unchecking everything
for (var i = elements.length; i--;) {
if (elements[i].type == 'checkbox') {
elements[i].checked = false;
}
}
//resetting the counter and disabling the button
checks_counter = 0;
document.getElementById("mybtn").disabled = true;
}
<body>
<h1>Checked two options</h1>
<br/>
<p>What are some of your favorite dishes?</p>
<table id="tblFoods">
<tr>
<td><input id="chkPizza" type="checkbox" onChange="EnableButton(this)" /><label for="chkPizza">Pizza</label></td>
</tr>
<tr>
<td><input id="chkLasagna" type="checkbox" onChange="EnableButton(this)" /><label for="chkLasagna">Lasagna</label></td>
</tr>
<tr>
<td><input id="chkPasta" type="checkbox" onChange="EnableButton(this)" /><label for="chkPasta">Pasta</label></td>
</tr>
<tr>
<td><input id="chkBarbecue" type="checkbox" onChange="EnableButton(this)" /><label for="chkBarbecue">Barbecue</label></td>
</tr>
</table>
<br />
<input type="submit" id="mybtn" disabled value="Submit" onclick="submitHandler()" />
</body>

You need to call your Enable function when you check boxes. Here's a working example: https://codesandbox.io/s/proud-architecture-ou5l2?file=/src/index.js
using your existing code:
var tblFoods = document.getElementById("tblFoods");
var checkeds = tblFoods.querySelectorAll("input");
const btn = document.getElementById("mybtn");
function enableButton() {
var counter = 0;
for (let i = 0; i < checkeds.length; i++) {
if (checkeds[i].checked) {
counter++;
}
}
if (counter >= 2) {
btn.disabled = false;
} else {
btn.disabled = true;
}
}
const handleClick = () => {
enableButton();
// do whatever else you need in here
};
checkeds.forEach((box) => box.addEventListener("click", handleClick));

You have to run your function when the user select the food, not when the user click the button. A simple solution is removing the onclick event from the button and adding the onchange event in every input:
<h1>Checked two options</h1>
<br />
<p>What are some of your favorite dishes?</p>
<table id="tblFoods">
<tr>
<td><input id="chkPizza" type="checkbox" onchange="EnableButton()" /><label for="chkPizza">Pizza</label></td>
</tr>
<tr>
<td><input id="chkLasagna" type="checkbox" onchange="EnableButton()" /><label for="chkLasagna">Lasagna</label>
</td>
</tr>
<tr>
<td><input id="chkPasta" type="checkbox" onchange="EnableButton()" /><label for="chkPasta">Pasta</label></td>
</tr>
<tr>
<td><input id="chkBarbecue" type="checkbox" onchange="EnableButton()" /><label for="chkBarbecue">Barbecue</label>
</td>
</tr>
</table>
<br />
<input type="submit" id="mybtn" disabled value="Submit" />

You could use something like:
document.querySelectorAll("input[type='checkbox']").forEach(e => e.addEventListener("click", () => {
const submitButton = document.querySelector("#mybtn");
if (!submitButton) return;
const checkedInputs = document.querySelectorAll("#tblFoods input[type='checkbox']:checked").length;
submitButton.disabled = checkedInputs < 2;
}));
In other words, every time a checkbox is clicked, a check is run on how many checkboxes are checked in total. If this amount is greater than or equal to two, the button is enabled, otherwise it is disabled.

Maybe i am wrong but since u had initialized counter = 0, every time that the function its called, it will automatically set to 0, so u should declare it globally in order to be an effective counter.
var counter = 0;
function EnableButton()
{
var tblFoods = document.getElementById("tblFoods");
var checkeds = tblFoods.getElementsByTagName("INPUT");
for(let i =0; i < checkeds.length;i++)
{
if(checkeds[i].checked)
{
counter++;
}
}
if(counter>=2)
{
document.getElementById("mybtn").disabled = false;
}
else
{
document.getElementById("mybtn").disabled = true;
}
}

Select multiple check boxes by clicking the first one

I have an html table with many check boxes. If I select the first check box, the next one is automatically selected. Does someone know how to do this? Also, the exact row number in table is unknown.
function toggle(source) {
var row_index = $("#checkFirst").index();
var row_first = $(".row").index();
checkboxes = document.getElementsByName('row');
for (var i = 0, n = checkboxes.length; i < n; i++) {
if (i == row_index && i == row_first) {
checkboxes[i].checked = source.checked;
}
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<tbody data-bind="foreach: list">
<tr>
<td><input type="checkbox" id="checkFirst" onClick="toggle(this)" /></td>
<td><input type="checkbox" name="row"></td>
<td><input type="checkbox"></td>
<td><input type="checkbox"></td>
<td><input type="checkbox"></td>
</tr>
</tbody>

You can use below code for this. First give class checkbox to all other checkboxes. Hope this can help you
$(function(){
$("#checkFirst").click(function () {
$('.checkbox').attr('checked', this.checked);
});
$(".checkbox").click(function(){
if($(".checkbox").length == $(".checkbox:checked").length) {
$("#checkFirst").attr("checked", "checked");
} else {
$("#checkFirst").removeAttr("checked");
}
});
});

You can try with below code. It will help you.
jQuery file:
https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js
<table>
<tbody data-bind="foreach: list">
<tr id="first">
<td><input type="checkbox" id="checkfirst" onClick="toggle('first',this.id)"/></td>
<td><input type="checkbox" name="row"></td>
<td><input type="checkbox" name="row"></td>
<td><input type="checkbox" name="row"></td>
<td><input type="checkbox" name="row"></td>
</tr>
<tr id="second">
<td><input type="checkbox" id="checksecond" onClick="toggle('second',this.id)"/></td>
<td><input type="checkbox" ></td>
<td><input type="checkbox"></td>
<td><input type="checkbox"></td>
<td><input type="checkbox"></td>
</tr>
</table>
Script
<script>
function toggle(source,id) {
chcked = $('#'+id).prop( "checked" );
if(chcked)
{
$('#'+source+' :checkbox').each(function() {
this.checked = true;
});
}
else
{
$('#'+source+' :checkbox').each(function() {
this.checked = false;
});
}
}
</script>

You can try this snippet.
function handleCheck(e) {
let will_change = false;
if (e.shiftKey && this.checked) {
checkboxes.forEach(element => {
if (element === this || element === last_checked) {
will_change = !will_change;
}
if (will_change) {
element.checked = true;
}
});
}
last_checked = this;
}
Then add a click event listener to each of the checkboxes you want to act as a group
https://codepen.io/anon/pen/GyQEJZ

this makes the first checkbox a global control for all
$('#checkFirst').on('change',function(){
if($(this).is(':checked'))
$('input[type="checkbox"]').prop('checked', true);
else
$('input[type="checkbox"]').prop('checked', false);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<tbody data-bind="foreach: list">
<tr>
<td><input type="checkbox" id="checkFirst"/></td>
<td><input type="checkbox" name="row"></td>
<td><input type="checkbox"></td>
<td><input type="checkbox"></td>
<td><input type="checkbox"></td>
</tr>
</tbody>
and this is to select the following checkboxes in the same row
$('input[type="checkbox"]').on('change',function(){
$(this).parent().nextAll().find('input[type="checkbox"]').prop('checked', $(this).is(':checked'));
});

jquery - get html string of table cells

I have some HTML that is being generated by some server-side code. The HTML that's generated looks like this:
<table id="myChoices">
<tr>
<td><input type="radio" name="choice" value="1" /></td>
<td>Monday</td>
<td>Mar 7</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="2" /></td>
<td>Tuesday</td>
<td>Mar 8</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="3" /></td>
<td>Wednesday</td>
<td>Mar 9</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="4" /></td>
<td>Thursday</td>
<td>Mar 10</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="5" /></td>
<td>Friday</td>
<td>Mar 11</td>
</tr>
</table>
When a user makes a choice, I need to get the two cells next to it. For example, if someone chooses the third option, I'm trying to get the following:
<td>Wednesday</td><td>Mar 9</td>
In my attempt to do this, I have the following jQuery:
function getHtml() {
var html = '';
var item = $("#myChoices input[type='radio']:checked");
if (item.length > 0) {
var grandparent = item.parent().parent();
var cells = grandparent.children();
var html = '';
for (var i = 0; i < cells.length; i++) {
if (i > 0) {
var cellHtml = cells[i];
html += cellHtml;
}
}
}
return html;
}
Unfortunately, my approach is not working. When I do the following:
var test = getHtml();
console.log(test);
I see the following in the console window:
[object HTMLTableCellElement][object HTMLTableCellElement]
Why? How do I get the actual HTML string?

Use outerHTML, instead you are storing the jQuery object in the variable.
var cellHtml = cells[i];
should be
var cellHtml = cells[i].outerHTML;
JS
function getHtml() {
var item = $("#myChoices input[type='radio']:checked");
if (item.length > 0) {
var grandparent = item.closest('tr'),
cells = grandparent.children();
var html = '';
for (var i = 1; i < cells.length; i++) {
html += cells[i].outerHTML + ' ';
}
}
return html;
}
js Fiddle

I propose you change the script a bit to simplify the process altogether.
$("#myChoices input").change( function() {
var string = $(this).parent().nextAll("td").text();
});
Variable "string" will contain the text you are looking for.

I believe you could just use something simple like:
$("input[type='radio']:checked").parents("tr").first().text();
Example: http://codepen.io/cchambers/pen/ONNawo

JSFIDDLE DEMO
Use this instead
var cellHtml = cells[i].outerHTML;
Complete JS
var html = '';
var item = $("#myChoices input[type='radio']:checked");
if (item.length > 0) {
var grandparent = item.parent().parent();
var cells = grandparent.children();
var html = '';
for (var i = 0; i < cells.length; i++) {
if (i > 0) {
var cellHtml = cells[i].outerHTML; //change here
html += cellHtml;
}
}
}
console.log(html);
Result format:
<td>Monday</td><td>Mar 7</td>

The easiest way would be to use the .html() method on a dynamic tr which contains the other two td elements.
A trick is to clone them then wrap them in a tr and get the html of that
var others = $(this).closest('td').siblings().clone();
alert( others.wrapAll('<tr>').parent().html());
$(function(){
$('#myChoices [name="choice"]').on('change', function(){
var others = $(this).closest('td').siblings().clone();
alert( others.wrapAll('<tr>').parent().html());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id="myChoices">
<tr>
<td><input type="radio" name="choice" value="1" /></td>
<td>Monday</td>
<td>Mar 7</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="2" /></td>
<td>Tuesday</td>
<td>Mar 8</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="3" /></td>
<td>Wednesday</td>
<td>Mar 9</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="4" /></td>
<td>Thursday</td>
<td>Mar 10</td>
</tr>
<tr>
<td><input type="radio" name="choice" value="5" /></td>
<td>Friday</td>
<td>Mar 11</td>
</tr>
</table>
In a function form it would be
function getHtml() {
var item = $("#myChoices input[type='radio']:checked");
var otherTD = item.closest('td').siblings().clone();
return otherTD.wrapAll('<tr>').parent().html();
}

You could use jquery's siblings method:
var textContents = $("#myChoices input[type='radio']:checked").siblings().html();

Calculate Row Total and Grand Total in gridview using jquery

Hi in below JavaScript code the multiplication is betweentxtQuantity which is textbox TemplateField in grid view and price which is BoundField in grid view.
My issue is my grid view have both txtQuantity and txtPrice as TemplateFieldes
<ItemTemplate><asp:TextBox ID="txtprice" runat="server" Text='<%# Bind("Price") %>'></asp:TextBox></ItemTemplate>
<ItemTemplate><asp:TextBox ID="txtQuantity" runat="server"></asp:TextBox></ItemTemplate>
i have tried to modify the java-script code
$("[id*=lblTotal]", row).html(parseFloat($("[id*=txtprice]", row).html()) * parseFloat($(this).val()));
but it give me NaNas result of multiplication
Original js code
<script type="text/javascript">
$(function () {
$("[id*=txtQuantity]").val("0");
});
$("[id*=txtQuantity]").live("change", function () {
if (isNaN(parseInt($(this).val()))) {
$(this).val('0');
} else {
$(this).val(parseInt($(this).val()).toString());
}
});
$("[id*=txtQuantity]").live("keyup", function () {
if (!jQuery.trim($(this).val()) == '') {
if (!isNaN(parseFloat($(this).val()))) {
var row = $(this).closest("tr");
$("[id*=lblTotal]", row).html(parseFloat($(".price", row).html()) * parseFloat($(this).val()));
}
} else {
$(this).val('');
}
var grandTotal = 0;
$("[id*=lblTotal]").each(function () {
grandTotal = grandTotal + parseFloat($(this).html());
});
$("[id*=lblGrandTotal]").html(grandTotal.toString());
});
</script>

There are some minor issues with your code, try this:
$(function () {
$("[id*=txtQuantity").val("0");
});
$(document).on("change", "[id*=txtQuantity]", function () {
if (isNaN(parseInt($(this).val()))) {
$(this).val('0');
} else {
$(this).val(parseInt($(this).val()).toString());
}
});
$(document).on("keyup mouseup", "[id*=txtQuantity]", function () {
if (!jQuery.trim($(this).val()) == '') {
if (!isNaN(parseFloat($(this).val()))) {
var row = $(this).closest("tr");
$("[id*=lblTotal]", row).html(parseFloat($("[id*=txtPrice]", row).val()) * parseFloat($(this).val()));
}
} else {
$(this).val('');
}
var grandTotal = 0;
$("[id*=lblTotal]").each(function () {
var value = $(this).html();
if(value != "")
grandTotal = grandTotal + parseFloat(value);
});
$("[id*=lblGrandTotal]").html(grandTotal.toString());
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table cellspacing="5">
<tr>
<td><input type="text" id="txtPrice1" value="100" /></td>
<td><input type="text" id="txtQuantity1" value="1" /></td>
<td><div id="lblTotal1" /></td>
</tr>
<tr>
<td><input type="text" id="txtPrice2" value="200" /></td>
<td><input type="text" id="txtQuantity2" value="2" /></td>
<td><div id="lblTotal1" /></td>
</tr>
<tr>
<td><input type="text" id="txtPrice3" value="300" /></td>
<td><input type="text" id="txtQuantity3" value="3" /></td>
<td><div id="lblTotal1" /></td>
</tr>
</table>
<div id="lblGrandTotal" />

Javascript "check all" a subset of multiple checkbox groups

My checkbox group are in html table. Each row has checbox group. I am trying to put a select_all button in each row of table (which can select all or unselect all the checkbox of that particular row). I used javascript for the purpose. However, select all button checks all the checkbxes of the table. I couldnt find a way to select_all button applicable to only single row. Any idea?
I think the change in javascript can solve this prob, but I am unfamiliar with javascript orjquery.
function checkAll(bx) {
var cbs = document.getElementsByTagName('input');
for (var i = 0; i < cbs.length; i++) {
if (cbs[i].type == 'checkbox') {
cbs[i].checked = bx.checked;
}
}
}
<form action="backend.php" method="POST" target="iframe_3">
<table border="10" width="900" bordercolor="green">
<tr>
<td colspan="3" style="background-color:#7F77AE">DNA</td>
<td><input type="checkbox" name="check_list[]" value="value 1">seq</td>
<td><input type="checkbox" name="check_list[]" value="value 2">codon</td>
<td><input type="checkbox" onclick="checkAll(this)">Select_all</td>
</tr>
<tr>
<td colspan="3" style="background-color:#7F77AE">RNA</td>
<td><input type="checkbox" name="check_list2[]" value="value 3">seq</td>
<td><input type="checkbox" name="check_list2[]" value="value 4">codon</td>
<td><input type="checkbox" onclick="checkAll(this)">Select_all</td>
</tr>
</table>

Using jQuery, this is a kind of trivial task. You actually just need to query for the <input> nodes within you specific <tr> node.
function checkAll(bx) {
var cbs = $( bx ).closest( 'tr' ).find( 'input:checkbox' );
for(var i=0; i < cbs.length; i++) {
if(cbs[i].type == 'checkbox') {
cbs[i].checked = bx.checked;
}
}
}
Without jQuery, this would look like
function checkAll(bx) {
var cbs = bx.parentNode.parentNode.querySelectorAll( 'input[type="checkbox"]' );
for(var i=0; i < cbs.length; i++) {
if(cbs[i].type == 'checkbox') {
cbs[i].checked = bx.checked;
}
}
}

jQuery way:
$(this).closest('tr').find('input[type=checkbox]').prop('checked', true);
fiddle

check this
<tr>
<td colspan="3" style="background-color:#7F77AE">DNA</td>
<td><input type="checkbox" name="check_list[]" value="value 1">seq</td>
<td><input type="checkbox" name="check_list[]" value="value 2">codon</td>
<td><input type="checkbox" onclick="checkAll(this)" id="check_list" role="selectall">Select_all</td>
</tr>
<tr>
<td colspan="3" style="background-color:#7F77AE">RNA</td>
<td><input type="checkbox" name="check_list2[]" value="value 3">seq</td>
<td><input type="checkbox" name="check_list2[]" value="value 4">codon</td>
<td><input type="checkbox" onclick="checkAll(this)" id="check_list2" role="selectall">Select_all</td>
</tr>
</table>
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script type="text/javascript">
(function($){
$(document).ready(function(e) {
$('[role="selectall"]').each(function(){
// + handle click of select all
$(this).bind('click.selall', handleSelectAll);
var group_name = $(this) .attr('id')+'[]';
$('[name='+group_name+']').bind('click.single', handleSingle);
})
});
function handleSingle(){
var grp_name = $(this).attr('name');
var sel_all_id = grp_name.replace('[','').replace(']', '');
if( $('[name='+grp_name+']').length == $('[name='+grp_name+']:checked').length){
$('#'+grp_name).prop('checked', true);
}else{
$('#'+grp_name).prop('checked', false)
}
}
function handleSelectAll(){
var group_name = $(this) .attr('id')+'[]';
if( $(this).is(':checked')){
$('[name='+group_name+']').prop('checked', true);
}else{
$('[name='+group_name+']').prop('checked', false);
}
}
})(jQuery)
</script>
the key is the id of the select all check box is same as the group name without paranthesis

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