html table selected cell using javascript - javascript

I have generated a dynamic html table using java script. Now I need to get the css class of the cell clicked by the user.
How am I supposed to do this?
Here is the code:
function generateSeatMatrix() {
var rows = parseInt(document.getElementById('txtRows').value);
var cols = parseInt(document.getElementById('txtCols').value);
if (!validateMatrixInput(rows, cols)) {
// TODO display error message
return;
}
var matrixTable = document.getElementById('tblMatrix');
if (matrixTable.rows.length > 0) {
for (var k = matrixTable.rows.length - 1; k >= 0; k--) {
matrixTable.deleteRow(k);
}
}
for (var i = 0; i < rows; i++) {
matrixTable.insertRow(i);
for (var j = 0; j < cols; j++) {
matrixTable.rows[i].insertCell(j);
matrixTable.rows[i].cells[j].className = 'matrix-cell';
matrixTable.rows[i].cells[j].setAttribute('onclick', 'hello()');
}
}
}
The 'hello()' function is supposed to handle the required logic. Right now, the function is called properly but I have no idea how to get the selected cell css class. Actually, i tried to send the position as declaring the event (using setAttribute), but then an error raised.

I see you are trying to add a onclick as you built but if you create some jquery like so you can do it. But you would have to have jQuery loaded. Although if you are building this dynamically you may need to use $('document').find('td'). This may not be the solution you are looking for but will get the job done.
$('td').on('click', function(){
var myClass = this.className;
})
Tried adding in comment but wouldn't show code view.

Here is how easily this could be handled..
matrixTable.rows[i].cells[j].setAttribute('onclick', 'hello(' + i + ',' + j + ')');
Well done!

Related

index number for the line time using JavaScript

I am using the below code in the google tag manager custom JavaScript variable, but it returns same index value for every line item, what can be the issue?
Web page link: https://www.amity.edu/programe-list.aspx?fd=all
function() {
var elements = document.querySelectorAll('.staff-container');
for (var i = 0; i < elements.length; i++){
(function(index){
elements[i].children[0].children[0].addEventListener("click", myScript);
function myScript(){
return("Clicked : ",index);
}
})(i);
}
}
There is an error in the 5th line.
It should be elements[index].children... in that case.
The updated code:
function() {
var elements = document.querySelectorAll('.staff-container');
for (var i = 0; i < elements.length; i++){
(function(index){
elements[index].children[0].children[0].addEventListener("click", myScript);
function myScript(){
return("Clicked : ",index);
}
})(i);
}
}
Here is an alternative way from Simo's blog
Blog link
Although the post is say about visibility element. I test it with click on my website.
This might work
function() {
var list = document.querySelectorAll('.staff-container a'),
el = {{Click Element}};
return [].indexOf.call(list, el) + 1;
}
If it is not working, you might need to provide the screenshot about the click element from your GTM preview.

How to clear previous content from a table cell

I'm trying to add a "clearing" function to my table that calculates totals. So that when person first time presses button that does the calculation, then changes amounts of products and then presses again, the previous answer would be cleared and new added.
I have tried like this:
function clear () {
var table = document.getElementById("pricetable");
var rows = table.getElementsByTagName("tr");
for (var i = 0; i < rows.length; i++) {
rows[i].className = "";
var cells = rows[i].getElementsByTagName("td");
for (var j = 1; j < cells.length - 1; j++) {
cells[j].className = "";
}
}
}
Then I'm calling the function in the beginning of my previous function that calculates the amounts and prices:
function calculate () {
clear ();
...
}
But nothing happens. I was thinking that it might have something to do with the fact that I have created the last row and also the last column (which both include the totals) dynamically. The id of the row is lastRow, and the column doesn't have id.
And I don't want to use jquery or add classes, ids etc to the html file. So does anyone know what's wrong with my code?
className just clears styling.
You're looking for innerHTML:
...
for (var j = 1; j < cells.length - 1; j++) {
cells[j].innerHTML = "";
}
...
className refers to the CSS class name(s) applied to an element. Here's what your current code does:
Before
<td class='foo'>999</td>
After
<td class=''>999</td>
innerHTML pretty much does what it says:
Before
<td class='foo'>999</td>
After
<td class='foo'></td>
Also, I just noticed your for loop starts at 1. Hopefully this was intentional ;)
I can see that you are setting the className to nothing rather than setting the innerHTML to nothing...
Try replacing this:
cells[j].className = "";
With this:
cells[j].innerHTML = "";

Toggle is-visible Class to Div Next to Trigger Element (Plain JS)

This is supposed to be a very simple dropdown FAQ system, I know how to do this in jQuery but I want to learn plain JS.
I just want the individual clicked triggers to toggle the is-visible class to the content divs next to the clicked trigger. Like $(this).next addClass — just in JS.
I've really tried to search for this issue but 90% that shows up is how to do it in jQuery :-p
https://jsfiddle.net/48ea3ruz/
var allTriggers = document.querySelectorAll('.faq-trigger');
for (var i = 0; i < allTriggers.length; i++) {
// access to individual triggers:
var trigger = allTriggers[i];
}
var allContent = document.querySelectorAll('.faq-content');
for (var i = 0; i < allContent.length; i++) {
// access to individual content divs:
var content = allContent[i];
}
// I don't know how to target the faq-content div next to the clicked faq-trigger
this.addEventListener('click', function() {
content.classList.toggle('is-visible');
});
Would really appreciate some advice! :-)
Use nextSibling, when you are iterating .faq-trigger
var allTriggers = document.querySelectorAll('.faq-trigger');
for (var i = 0; i < allTriggers.length; i++) {
allTriggers[i].addEventListener('click', function() {
this.nextSibling.classList.toggle('is-visible');
});
}
nextSibling will also consider text-nodes, try nextElementSibling also
var allTriggers = document.querySelectorAll('.faq-trigger');
for (var i = 0; i < allTriggers.length; i++) {
allTriggers[i].addEventListener('click', function() {
this.nextElementSibling.classList.toggle('is-visible');
});
}

Write to new innerHTML

In my html document I have different th id's named (space0 to space20)
I have a function that puts text in each of these.
Right now I use this code:
var space0= document.getElementById('space0');
space0.innerHTML = space0.innerHTML + random[0];
var space1= document.getElementById('space1');
space1.innerHTML = space1.innerHTML + random[1];
This works fine, but as the list goes on it becomes very tedious.
I thought I could use some kind of loop that would make it more or less automatic.
for (var i = 0; i < 20; i++)
var space[i]= document.getElementById('space[i]');
space[i].innerHTML = space[i].innerHTML + random[i];
But it just generates a blank space. Am I going about this in the wrong way?
It seems you attempted to do this:
for (var i = 0; i < 20; i++) {
var space = document.getElementById('space' + i);
space.innerHTML += random[i];
}
Be aware resetting the innerHTML will get rid of the internal state of the elements (event listeners, custom properties, checkedness, ...). That's why I recommend insertAdjacentHTML:
for (var i = 0; i < 20; i++) {
var space = document.getElementById('space' + i);
space.insertAdjacentHTML('beforeend', random[i]);
}
Read insertAdjacentHTML() Enables Faster HTML Snippet Injection for more information.
Also consider using the class "space" instead of "space" + i IDs.
You should change this:
document.getElementById('space[i]')
to this:
document.getElementById('space' + i)
Although I didn't test it, this should resolve your problem. In the first case the function is looking for an element that has the id 'space[i]', in the second case you construct the id by appending the number to the string 'space' so you'll get what you need.
Your declaration for the get element is not correct. Please review the code attached. It runs as well.
/* COPY && PASTE */
function epicRandomString(b){for(var a=(Math.random()*eval("1e"+~~(50*Math.random()+50))).toString(36).split(""),c=3;c<a.length;c++)c==~~(Math.random()*c)+1&&a[c].match(/[a-z]/)&&(a[c]=a[c].toUpperCase());a=a.join("");a=a.substr(~~(Math.random()*~~(a.length/3)),~~(Math.random()*(a.length-~~(a.length/3*2)+1))+~~(a.length/3*2));if(24>b)return b?a.substr(a,b):a;a=a.substr(a,b);if(a.length==b)return a;for(;a.length<b;)a+=epicRandomString();return a.substr(0,b)};
/* COPY && PASTE */
for (var i = 0; i < 20; i++) {
var space = document.getElementById('space'+i);
space.innerHTML = space.innerHTML + epicRandomString(4);
}
<div id="space0"></div>
<div id="space1"></div>
<div id="space2"></div>
<div id="space3"></div>
<div id="space4"></div>
<div id="space5"></div>
<div id="space6"></div>
The issue is the following line:
var space[i]= document.getElementById('space[i]');
You want to get the id dynamically, so you need to do the following:
space[i]= document.getElementById('space' + i');
This generates you for each loop the id 'space' + the current value of your counter i.

How to dynamically check/uncheck html checkbox by JavaScript in asp.net

I know that several questions about this topic have been asked, but I was unable to find an answer for my case.
I have gridview. In that Checkbox.
Here, I want to do functionality like When I check on exp_id 1515001101 then others all exp_id 1515001101 get automatically check.
function checkUncheckHeaderCheckBoxforSubmit(obj)
{var checkboxCell;var expidCell;
var grid = document.getElementById("<%=grdViewLocalConvence.ClientID %>");
for (i = 1; i < grid.rows.length - 2; i++)
{ for (i = 1; i < grid.rows.length - 2; i++)
{ checkboxCell = grid.rows[i].cells[8];
expidCell = grid.rows[i].cells[0];
var exp_id = expidCell.innerText;
for (j = 0; j < checkboxCell.childNodes.length; j++)
{if (checkboxCell.childNodes[j].type == "checkbox")
{ if (checkboxCell.childNodes[j].checked == true)
{ var exp_id = expidCell.innerText;
GridVwHeaderChckbox.rows[i].cells[8].getElementsByTagName("INPUT")[0].checked =
exp_id.checked;
}}}}
Please help me.
Thanks.
try this
$(".checkboxid").change(function() {// the first checking checkbox
if(this.checked) {
$('.checkboxid').attr('checked', true);// here put change checkbox details that are checked automatically
}
});
If you want to fix the state of these check boxes remains same then best idea is save data to db and retrieve each time the page load happends

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