Deleting a table row using Javascript through content identification

Question

Deleting a table row using Javascript through content identification

I'm working with the following code:

<table>
    <tbody>
        <tr>
            <td align="left">X</td>
            <td>X1</td>     
        </tr>
        <tr>        
            <td width="150" align="left">Y</td>
            <td>Y1</td>
        </tr>
        <tr>    
            <td align="left">Status: </td>
            <td colspan="4">
                <select name="status" size="1">
                    <option selected="selected" value="2">one</option>
                    <option value="1">two</option>
                </select>                   
            </td>
        </tr>
        <tr>        
            <td width="150" align="left">Z</td>
            <td>Z1</td>
        </tr>   
    </tbody>
</table>

My goal is to delete this specific line using Javascript:

<tr>    
    <td align="left">Status: </td>
    <td colspan="4">
        <select name="status" size="1">
            <option selected="selected" value="2">one</option>
            <option value="1">two</option>
        </select>                   
    </td>
</tr>

The challenge is that there are no IDs or classes for identification. Is it possible to remove the row by searching for "Status: " or name="status" using JavaScript specifically for Firefox (intending to use it with Greasemonkey)?

Unfortunately, jQuery cannot be used and the code cannot be edited to add any IDs.

Warm regards, Bernte

javascript

Answer 1

Answer №1

If your website doesn't need to support IE7, you have the option to do the following:

var elements = document.querySelectorAll('td[align="left"]');
for (var i=0; i<elements.length; i++) {
    var text = elements[i].textContent || elements[i].innerText;
    if (text.trim()=='Status:') {
       elements[i].parentNode.parentNode.removeChild(elements[i].parentNode);   
    }
}

See it in action here

If you want compatibility with IE7, you may need to iterate through all rows and cells, although this approach might be less straightforward.

Keep in mind that I used trim, which is not supported in IE8. To make it work on this browser if necessary, you can use this common workaround (from MDN):

if(!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g,'');
  };
}

Answer 2

If your website doesn't need to support IE7, you have the option to do the following:

var elements = document.querySelectorAll('td[align="left"]');
for (var i=0; i<elements.length; i++) {
    var text = elements[i].textContent || elements[i].innerText;
    if (text.trim()=='Status:') {
       elements[i].parentNode.parentNode.removeChild(elements[i].parentNode);   
    }
}

See it in action here

If you want compatibility with IE7, you may need to iterate through all rows and cells, although this approach might be less straightforward.

Keep in mind that I used trim, which is not supported in IE8. To make it work on this browser if necessary, you can use this common workaround (from MDN):

if(!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g,'');
  };
}

Answer 3

Answer №2

function deleteRowByValue(table, value) {
    var cells = table.getElementsByTagName("TD");
    for(var i = 0; i < cells.length; i++) {

        // Make sure the cell has a child node to prevent errors
        if(!cells[i].firstChild) {
            continue;
        }

        if(cells[i].firstChild.nodeValue == value) {
            var row = cells[i].parentNode;
            row.parentNode.removeChild(row);
            break;
        }
    }
}

To start off, find your table by using getElementsByTagName since there is no ID available (assuming it's the first table in the document).

var myTable = document.getElementsByTagName("table")[0];

Next, call the function with the required parameters:

deleteRowByValue(myTable,"Status: ");

Answer 4

function deleteRowByValue(table, value) {
    var cells = table.getElementsByTagName("TD");
    for(var i = 0; i < cells.length; i++) {

        // Make sure the cell has a child node to prevent errors
        if(!cells[i].firstChild) {
            continue;
        }

        if(cells[i].firstChild.nodeValue == value) {
            var row = cells[i].parentNode;
            row.parentNode.removeChild(row);
            break;
        }
    }
}

To start off, find your table by using getElementsByTagName since there is no ID available (assuming it's the first table in the document).

var myTable = document.getElementsByTagName("table")[0];

Next, call the function with the required parameters:

deleteRowByValue(myTable,"Status: ");

Answer 5

Answer №3

let findStatus = document.evaluate("//td[starts-with(.,'Status:')]", document.body, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
let statusElement = findStatus.singleNodeValue.parentNode;
while (statusElement.firstChild)
  statusElement.removeChild(statusElement.firstChild);

View the code on Jsbin at http://jsbin.com/urehuw/1/edit

Answer 6

let findStatus = document.evaluate("//td[starts-with(.,'Status:')]", document.body, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
let statusElement = findStatus.singleNodeValue.parentNode;
while (statusElement.firstChild)
  statusElement.removeChild(statusElement.firstChild);

View the code on Jsbin at http://jsbin.com/urehuw/1/edit

Answer 7

Answer №4

Do you want your code to be compatible with older versions of Internet Explorer?

function closestElement(el, tag) {
    if (!el || !tag) {
        return false;
    }
    else {
        return el.parentNode.tagName.toLowerCase() == tag ? el.parentNode : closestElement(el.parentNode, tag);
    }
}

// Retrieve all 'select' elements
var selectElements = document.getElementsByTagName('select');

// Iterate through each 'select' element found
for (var i=0, length = selectElements.length; i<length; i++) {
    // Check if the 'select' element has the name attribute set to 'status'
    if (selectElements[i].name == 'status') {
        // Use the closestElement() function to find the nearest ancestor 'tr' element
        var tableRow = closestElement(selectElements[i], 'tr');
        // Remove the 'tr' child element from its parent
        tableRow.parentNode.removeChild(tableRow);
    }
}

Check out the JS Fiddle demo here.

Answer 8

Do you want your code to be compatible with older versions of Internet Explorer?

function closestElement(el, tag) {
    if (!el || !tag) {
        return false;
    }
    else {
        return el.parentNode.tagName.toLowerCase() == tag ? el.parentNode : closestElement(el.parentNode, tag);
    }
}

// Retrieve all 'select' elements
var selectElements = document.getElementsByTagName('select');

// Iterate through each 'select' element found
for (var i=0, length = selectElements.length; i<length; i++) {
    // Check if the 'select' element has the name attribute set to 'status'
    if (selectElements[i].name == 'status') {
        // Use the closestElement() function to find the nearest ancestor 'tr' element
        var tableRow = closestElement(selectElements[i], 'tr');
        // Remove the 'tr' child element from its parent
        tableRow.parentNode.removeChild(tableRow);
    }
}

Check out the JS Fiddle demo here.

Answer 9

Answer №5

try this method

    let selectTag = document.getElementsByTagName("tr")[3]; // selecting the third tr tag
         document.removeChild(selectTag);

Answer 10

try this method

    let selectTag = document.getElementsByTagName("tr")[3]; // selecting the third tr tag
         document.removeChild(selectTag);

Deleting a table row using Javascript through content identification

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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