Stack Overflow Asked on December 25, 2021
Situation: I have created a html table header entirely with javascript and now I want to add a delete column feature which takes the cell index as an argument. However, every time I try to get the cell index of the created th element the index obtained is -1. Once I get the element by tag name there is no longer any issues with getting the respective cell indices of the header.
Any help is highly appreciated.
let headerFragment = document.createDocumentFragment();
//Append counter at the beginning of each row
let number_th = document.createElement("th")
let number_txt = document.createTextNode('#');
number_th.appendChild(number_txt);
headerFragment.appendChild(number_th);
//Append active checkbox
let active_th = document.createElement("th")
let active_txt = document.createTextNode('Active');
active_th.appendChild(active_txt);
headerFragment.appendChild(active_th);
//Append all other data fields
if (headersArray){
headersArray.forEach((header, index) => {
let th = document.createElement("th");
//Create text identifier
let txt = document.createTextNode(headersArray[index]);
//Create delete column button
let delete_column = document.createElement("p");
delete_column.innerHTML = "Delete";
delete_column.onclick = function() {
//Delete column - here is the problem
alert(th.cellIndex) //alerts -1
deleteColumn(th.cellIndex);
}
th.appendChild(txt);
th.appendChild(delete_column);
headerFragment.appendChild(th);
});
//Final append
tableHeader.appendChild(headerFragment);
}
If I run this function all indices are properly retrieved
function myFunction() {
var x = document.getElementsByTagName("th");
var txt = "";
var i;
for (i = 0; i < x.length; i++) {
txt = txt + "The index of Cell "+(i+1)+" is: "+x[i].cellIndex+"<br>";
}
alert(txt);
}
I suggest you assign an id dynamically to your "th" element and then delete it using that id.
declare a variable
let i = 0;
and then
let th = document.createElement("th");
th.id = i++;
in your delete may be
delete_column.onclick = function() {
let elementToDelete = document.getElementById(th.id);
elementToDelete.parentNode.removeChild(elementToDelete);
}
Answered by Declare on December 25, 2021
The docs state that cellIndex
returns -1 when the cell doesn't belong to a tr
, so my guess would be that that is the case.
Answered by Bart Barnard on December 25, 2021
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