var arr=["1","2","-3","4","-5","-6","7"] // data changes as well arr[] size ;
Here, scenario is, it is to me made in table dynamically.Table depends on arr[].
1)create a single row <tr> <td></td></tr>, where number of <td> </td> depends upon length of arr[];
2)Provide style="background-color" to <td> ;
3)For negative numbers, <td> will be created at index of that negative number.
For eg: here negative number indexes are 3,5,6.
So, for negative numbers in arr[], create <td> in next row <tr><td></td></tr> ie <td> at 3,5,6 position with background-color.
Here, for -3,-5,-6 of arr[] create <td> in first row <tr> but dont provide background-color;
4)If no negative numbers in an arr[], then dont create second row ;
Here, arr[] data is changing, so table should be dynamic.
For above case, just few codes to understand only
//length of arr = 7;
<tr>
<td style="background:#ccc">1</td>
<td style="background:#ccc">2</td>
<td style="background:#ccc"></td>
<td style="background:#ccc">4</td>
<td></td>
<td></td>
<td style="background:#ccc">7</td>
</tr>
<tr>
<td></td>
<td></td>
<td style="background:#ccc">-3</td>
<td></td>
<td style="background:#ccc">-5</td>
<td style="background:#ccc">-6</td>
<td></td>
</tr>
The above scenario will change according to data. Please help
var arr = ["1","2","-3","4","-5","-6","7"];
var table = document.createElement("table"), // create the table element
tbody = document.createElement("tbody"); // create the table body element
table.appendChild(tbody); // add the table body to table
// ### POSITIVE ROW ######################
var tr = document.createElement("tr"); // create the table row element
arr.forEach(function(e) { // for each element e in arr
var td = document.createElement("td"); // create a table cell element
if(e >= 0) { // if e is positive
td.textContent = e; // then change the text content of this cell to e
td.style.background = "#ccc"; // and change the background as well
}
tr.appendChild(td); // add the cell to the row (if the number is negative the cell will be empty and without background)
});
tbody.appendChild(tr); // add the row to table
//### NEGATIVE ROW ######################
tr = document.createElement("tr"); // same but for negative numbers ...
arr.forEach(function(e) {
var td = document.createElement("td");
if(e < 0) {
td.textContent = e;
td.style.background = "#ccc";
}
tr.appendChild(td);
});
tbody.appendChild(tr);
document.body.appendChild(table);
You can group some of the code in a function and reuse it:
// elt is shortcut for document.createElement
function elt(tag) {
return document.createElement(tag);
}
// take an array and a condition function conditionFN and return a row of all the element that passed the condition function with a background of #ccc
function makeRow(arr, conditionFN) {
var tr = elt("tr");
arr.forEach(function(e) {
var td = elt("td");
if (conditionFN(e)) {
td.textContent = e;
td.style.background = "#ccc";
}
tr.appendChild(td);
});
return tr;
}
// take an array and return the equivalent table element
function makeTable(arr) {
var table = elt("table"),
tbody = elt("tbody");
table.appendChild(tbody);
tbody.appendChild(makeRow(arr, function(e) { return e >= 0; })); // the condition function only allows positive numbers => positive row
tbody.appendChild(makeRow(arr, function(e) { return e < 0; })); // the condition function only allows negative numbers => negative row
return table;
}
document.body.appendChild(makeTable([1, 2, -3, 4, -5, -6, -7, 8, 9, 10]));
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