单击按钮时如何删除表格中的行？ 使用Javascript

Question

HTML from with table and button:

<div>
                <h1>Info</h1>
                <form>
                    <table id="t">
                        <tr>
                            <th></th>
                            <th>index</th>
                            <th>name</th>
                            <th>job</th>
                            <th>date</th>
                            <th>department</th>
                        </tr>
                        <tr>
                            <td><input type="checkbox"></td>
                            <td>1</td>
                            <td>Alex</td>
                            <td>Hacker</td>
                            <td>100000000000000000</td>
                            <td>2</td>
                        </tr>
                    </table>
                    <br/>
                    <input type="submit" value="delete" onclick="deleteRow()">
                </form>
        </div>

I want to remove rows, which have establishes checkbox. Delete should be at the click of a button.

Javascript function that should delete:

function deleteRow() {
    let table = document.getElementById('t')
    let boxs = table.getElementsByTagName("input")
    for (i = 0; i < boxs.length; i++){
        if(boxs[i] == true) {
            table.deleteRow((boxs[i].parentNode.parentNode).rowIndex)
        }
    }
}

I debugged this code, the size of the array defined correctly, but doesn't enter to condition.

Answer 1

In you code you don't need to change much. You need to change if statement like below.

From

if(boxs[i] == true) {

}

To

if(boxs[i].checked == true) {

}

Because box[i] is object. So If you want to get the check status you need to call boxs[i].checked. This will give you true/false.

 function deleteRow() { let table = document.getElementById('t') let boxs = table.getElementsByTagName("input") for (i = 0; i < boxs.length; i++){ if(boxs[i].checked == true) { table.deleteRow((boxs[i].parentNode.parentNode).rowIndex) } } return false; } 

 <div> <h1>Info</h1> <form onsubmit="return deleteRow()"> <table id="t"> <tr> <th></th> <th>index</th> <th>name</th> <th>job</th> <th>date</th> <th>department</th> </tr> <tr> <td><input type="checkbox"></td> <td>1</td> <td>Alex</td> <td>Hacker</td> <td>100000000000000000</td> <td>2</td> </tr> </table> <br/> <input type="submit" value="delete"> </form> </div>