javascript – 使用Ctrl单击和Shift单击选择多个HTML表格行

Demo

我想使用Windows Shift和Ctrl键选择多行,如Windows中的多个文件夹选择.

从所选行的表中,我必须获取第一列(学生ID),并传递给服务器端C#并从数据库中删除这些记录.

我已经在javascript中编写了代码,但是该类名未被应用到< tr>在Shift或Ctrl左键单击.

HTML

<table id="tableStudent" border="1">
    <thead>
        <tr>
            <th>ID</th>
            <th>Name</th>
            <th>Class</th>
        </tr>
    </thead>
    <tbody>
        <tr onmousedown="RowClick(this,false);">
            <td>1</td>
            <td>John</td>
            <td>4th</td>
        </tr>
         <tr onmousedown="RowClick(this,false);">
            <td>2</td>
            <td>Jack</td>
            <td>5th</td>
        </tr>
         <tr onmousedown="RowClick(this,false);">
            <td>3</td>
            <td>Michel</td>
            <td>6th</td>
        </tr>
        <tr onmousedown="RowClick(this,false);">
            <td>4</td>
            <td>Mike</td>
            <td>7th</td>
        </tr>
        <tr onmousedown="RowClick(this,false);">
            <td>5</td>
            <td>Yke</td>
            <td>8th</td>
        </tr>
         <tr onmousedown="RowClick(this,false);">
            <td>6</td>
            <td>4ke</td>
            <td>9th</td>
        </tr>
        <tr onmousedown="RowClick(this,false);">
            <td>7</td>
            <td>7ke</td>
            <td>10th</td>
        </tr>
    </tbody>
</table>

JavaScript的

var selectedrow;
function RowClick(currenttr,lock) {
var trs =tableStudent.tBodies[0].getElementsByTagName("tr");
var cnt;
    if(window.event.button==2)
    {
        if(currenttr.className=='selected')
        return false;
    }
alert(trs.length);
if (((window.event.shiftKey) && (window.event.ctrlKey) ) ||(window.event.shiftKey))
    {
        for(var j=0; j<trs.length; j++)
        {
            if (trs[j].className!='normallock')
            {
                trs[j].className='normal';
            }
        }
        var mark=false;

        if (typeof(selectedrow)=="undefined")
        {
            selectedrow=currenttr;
            selectedrow.className='selected'
            return false;
        }
        for(var j=0; j<trs.length; j++)
        {

            if ((trs[j].id ==selectedrow.id) || (trs[j].id ==currenttr.id) )
            {
                if (trs[j].className!='normallock')
                {
                trs[j].className='selected'
                mark = !(mark);
                }
            }
            else
            {
                if(mark==true)
                {
                    if (trs[j].className!='normallock')
                    trs[j].className='selected'
                }
            }
        }
    }
    else if(window.event.ctrlKey)
    {
        //if ctrl key is seelcted while selecting the patients
        // select the patient with currently clicked row plus
        // maintain the prevIoUs seelcted status
        cnt=0;
        for(var j=0; j<trs.length; j++)
        {
            if(trs[j].id == currenttr.id)
            {
                if(trs[j].className=='selected')
                {
                    trs[j].className='normal';
                }else
                {
                    trs[j].className='selected';
                }
            }
            if(trs[j].className=='selected')
            {
                cnt++;
            }
        }

        if(cnt==0)
        {
            selectedrow=undefined;
            return false;
        }
    }
    else
    {
        for(var j=0; j<trs.length; j++)
        {
            if(trs[j].id == currenttr.id)
            {
                trs[j].className='selected'
            }
            else
            {
                if (trs[j].className!='normallock')
                trs[j].className='normal';
            }

        }
    }
    selectedrow=currenttr;
}

解决方法

这可能不是你想要的所有功能,因为问题有点模糊,但他试图添加Ctrl或Shift鼠标左键来选择或取消选择多个表行 – see demo和下面的代码.免责声明：只有在Chrome和代码测试中,几乎可以肯定地进行优化.

JavaScript的

var lastSelectedRow;
var trs = document.getElementById('tableStudent').tBodies[0].getElementsByTagName('tr');

// disable text selection
document.onselectstart = function() {
    return false;
}

function RowClick(currenttr,lock) {
    if (window.event.ctrlKey) {
        toggleRow(currenttr);
    }

    if (window.event.button === 0) {
        if (!window.event.ctrlKey && !window.event.shiftKey) {
            clearAll();
            toggleRow(currenttr);
        }

        if (window.event.shiftKey) {
            selectRowsBetweenIndexes([lastSelectedRow.rowIndex,currenttr.rowIndex])
        }
    }
}

function toggleRow(row) {
    row.className = row.className == 'selected' ? '' : 'selected';
    lastSelectedRow = row;
}

function selectRowsBetweenIndexes(indexes) {
    indexes.sort(function(a,b) {
        return a - b;
    });

    for (var i = indexes[0]; i <= indexes[1]; i++) {
        trs[i-1].className = 'selected';
    }
}

function clearAll() {
    for (var i = 0; i < trs.length; i++) {
        trs[i].className = '';
    }
}

HTML

<table id="tableStudent" border="1">
    <thead>
        <tr>
            <th>ID</th>
            <th>Name</th>
            <th>Class</th>
        </tr>
    </thead>
    <tbody>
        <tr onmousedown="RowClick(this,false);">
            <td>7</td>
            <td>7ke</td>
            <td>10th</td>
        </tr>
    </tbody>
</table>

CSS

.selected {
    background: lightBlue
}

我也将看看addEventListener vs onclick,并将事件处理程序绑定到HTML之外并转换为JavaScript.这被称为Unobtrusive Javascript.

您可能想要阅读的资源：

> Retrieve Table Row Index of Current Row
> disable text selection while pressing ‘shift’
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort

javascript – 使用Ctrl单击和Shift单击选择多个HTML表格行

解决方法

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