Insert the input into mysql - javascript

I am a newbie in programming. Excuse my ignorance.
My english is not too good. Hope you understand what I mean in my question.
How can I get the value of id NILAI below and insert into mysql.
html += '<tr>';
html += '<td class="indi" align="center">';
html += row.nis;
html += '</td>';
html += '<td class="indi">';
html += row.nama_siswa;
html += '</td>';
html += '<td>';
html += '<input id="nilai" type="text" placeholder="nilai"/>';
html += '</td>';
html += '</tr>';
I want the input value insert into mysql where col nis in mysql table same with row. nis
I've been trying this, but It's wrong. It just read the value of the first row in input nilai and make a new nis=0.
var data1 = document.getElementById("nilai") ;
var i;
for (i=0;i<data1.length;i++) {
var sql='INSERT INTO nilaitugas(no_tugas, nilai) VALUES ("'+dataid+'","'data1.elements[i]. value+'")';
}
Note: dataid is a variabel from url that I need to input.

you should use this code in javascript to get the value
var data1 = document.getElementById("nilai").value;

USE:
var data1 = document.getElementById("nilai").value; //to get the value in the input tag
var sql='INSERT INTO nilaitugas(no_tugas, nilai) VALUES ("'+dataid+'","'data1+'")';

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`
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That line is for my variable last modified that is the same as my create_date variable.
The DOM lastModified property in HTML. That displayed the time of the last time i modified the file.
new Date().toLocaleDateString()
is that what you need?

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Is this more like what you're trying to do?
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additional code based on further questions below: (additional edits above and below to add totals to each row)
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This outer loop gets the inputs for each row, then uses your loop to add them.
#Noah B
The below codes is the ans i got from you to display the tables which ive modified it abit to acomodate my requirements.
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{
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}
for(var k=1;k<=1;k++)//display project or final exams txt box
{
html+= "<td style='border:1px solid black;'><input type='text' class='stdMrk' placeholder='0' value='0' /></td>";
}
html += "</tr>";
}
But my other issue is that now i need to retrieve the value of each rows and from what you can see,ive added an additional for loop to display another set of textboxes which has the same class name as the previous one.
For example n1 will have 3int value entered from the keyboard and i have to compute that 3value and return it. It must be a loop which get repeated for each names.
This is the codes i've written to retrieve the value but it display all the value 1by 1 without any means to know from which rows this belong to..
var txtValue = document.getElementsByClassName("stdMrk");
if(txtValue.length>0)
{
for(var i = 0;i<=y;i++)
{
x += parseInt(txtValue[i].value);
}
alert(x);
}//edit ive manage to create this but still need to iterate through all the names...
Thanks in advance..

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