Question

我想使用Windows Shift 和 Ctrl 键选择多行，例如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）并传递到服务器端C#并从数据库中删除这些记录。

我在javascript中编写了代码，但 classname 未应用于{kbd> Shift 或 Ctrl + <<tr> em>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>

的JavaScript

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;
}

Answer 1

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 + 鼠标左键按钮选择或取消选择多个表行 - see demo和下面的代码。 免责声明：仅在Chrome和代码中进行测试几乎可以肯定地进行优化。

<强>的JavaScript

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 = '';
    }
}

<强> 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>

<强> CSS

.selected {
    background: lightBlue
}

我还会查看addEventListener vs onclick并将事件处理程序绑定从 HTML 移到 JavaScript 。这称为Unobtrusive Javascript。

您可能想要阅读的资源：

Answer 2

这是我最近为一个项目写的 jQuery插件。思想分享......

完全像你习惯的那样工作，+ 它是非常快因为它在数组上运行而不需要检查属性，类等，并且add / removeClass只触发所选元素：

// Use like:
// $("table").selekt();
//
// Available options:
$("table").selekt({
  children: "tr",           // Elements to target (default: "tbody tr")
  className: "selected",    // Desired CSS class  (default: "selected")
  onSelect: function(sel) { // Useful callback
    $("span").text(sel.length + ' in ' + this.id);
  }
});

.selected { background: #0bf; }
table {border: 1px solid #555;display: inline-block; vertical-align: top;}

<p>Seleceted: <span id="info">0</span></p>

<table id="table_1">
  <tr><td>1 SELECT ME</td></tr>
  <tr><td>2 SELECT ME</td></tr>
  <tr><td>3 SELECT ME</td></tr>
  <tr><td>4 SELECT ME</td></tr>
  <tr><td>5 SELECT ME</td></tr>
  <tr><td>6 SELECT ME</td></tr>
</table>

<table id="table_2">
  <tr><td>1 SELECT ME</td></tr>
  <tr><td>2 SELECT ME</td></tr>
  <tr><td>3 SELECT ME</td></tr>
  <tr><td>4 SELECT ME</td></tr>
</table>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
;(function($) {
  // selekt jQuery plugin // http://stackoverflow.com/a/35813513/383904
  $.fn.selekt = function() {

    var settings = $.extend({
      children: "tbody tr",
      className: "selected",
      onSelect: function() {}
    }, arguments[0] || {});

    return this.each(function(_, that) {
      var $ch = $(this).find(settings.children),
        sel = [],
        last;

      $ch.on("mousedown", function(ev) {
        var isCtrl = (ev.ctrlKey || ev.metaKey),
          isShift = ev.shiftKey,
          ti = $ch.index(this),
          li = $ch.index(last),
          ai = $.inArray(this, sel);

        if (isShift || isCtrl) ev.preventDefault();

        $(sel).removeClass(settings.className);

        if (isCtrl) {
          if (ai > -1) sel.splice(ai, 1);
          else sel.push(this);
        } else if (isShift && sel.length > 0) {
          if (ti > li) ti = [li, li = ti][0];
          sel = $ch.slice(ti, li + 1);
        } else {
          sel = ai < 0 || sel.length > 1 ? [this] : [];
        }

        last = this;
        $(sel).addClass(settings.className);
        settings.onSelect.call(that, sel);
      });
    });
  };
}(jQuery));
</script>

Answer 3

我使用了所有Windows 7资源管理器行为和jquery鼠标事件。

http://jsfiddle.net/ubershmekel/nUV23/6/

请注意：

当您单击时，为下一次班次设置 -
使用Ctrl-Shift展开当前选择，而不是像Shift-alone那样进行转动。
使用Ctrl-单击添加枢轴，您可以使用Ctrl-Shift在新枢轴周围展开该选择。

js：

var selectionPivot;
// 1 for left button, 2 for middle, and 3 for right.
var LEFT_MOUSE_BUTTON = 1;
var trs = document.getElementById('tableStudent').tBodies[0].getElementsByTagName('tr');
var idTds = $('td:first-child');
idTds.each(function(idx, val) {
    // onselectstart because IE doesn't respect the css `user-select: none;`
    val.onselectstart = function() { return false; };
    $(val).mousedown(function(event) {
        if(event.which != LEFT_MOUSE_BUTTON) {
            return;
        }
        var row = trs[idx];
        if (!event.ctrlKey && !event.shiftKey) {
            clearAll();
            toggleRow(row);
            selectionPivot = row;
            return;
        }
        if (event.ctrlKey && event.shiftKey) {
            selectRowsBetweenIndexes(selectionPivot.rowIndex, row.rowIndex);
            return;
        }
        if (event.ctrlKey) {
            toggleRow(row);
            selectionPivot = row;
        }
        if (event.shiftKey) {
            clearAll();
            selectRowsBetweenIndexes(selectionPivot.rowIndex, row.rowIndex);
        }
    });
});

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

function selectRowsBetweenIndexes(ia, ib) {
    var bot = Math.min(ia, ib);
    var top = Math.max(ia, ib);

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

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

CSS：

.selected {
    background: #bdf;
}

td:first-child {
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}

td,th {
    padding: 3px;
    border: 2px solid #aaa;
}

table {
    border-collapse: collapse;
}

Answer 4

检查此示例：

JSFiddle: Highlight list with shift and ctrl

部分代码：

switch(e.type) {
    case "keydown" :
        console.log('k_down');
        keysPressed.push(e.keyCode);
        break;
    case "keyup" :
        console.log('k_up');
        var idx = keysPressed.indexOf(e.keyCode);
        if (idx >= 0)
            keysPressed.splice(idx, 1);
        break;
}

来源可以在这里找到： Source files github

Answer 5

我知道这个问题已经回答了，而且已经很老了，但我发现安迪的回答非常有用。也许是因为andyb的答案现在可能已经过时了，但我最终不得不改变他的解决方案来处理我的项目，所以我想我会分享我的更新版本。这是我最终使用的jQuery。

$(document).ready(function(){
    //put all the table rows in a variable after page load to pass in to RowClick
    var trs = $('#tableStudent tr')
    //bind the click handler to all the table rows
    $('tr').on('click', function(){
        //call the RowClick function on click event
        RowClick($(this),false,trs)
    })
})

//declare variable to store the most recently clicked row
var lastSelectedRow;

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

function RowClick(currentrow, lock, rows) {
    //if control is held down, toggle the row
    if (window.event.ctrlKey) {
        toggleRow(currentrow);
    }

    //if there are no buttons held down...
    if (window.event.button === 0) {

        //if neither control or shift are held down...
        if (!window.event.ctrlKey && !window.event.shiftKey) {
            //clear selection
            clearAll(rows);
            //toggle clicked row
            toggleRow(currentrow);
        }

        //if shift is held down...
        if (window.event.shiftKey) {
            //pass the indexes of the last selected row and currently selected row along with all rows
            selectRowsBetweenIndexes([lastSelectedRow.index(), currentrow.index()], rows)
        }
    }
}

function toggleRow(row) {
    //if the row is not the header row...
    if (!row.hasClass('header-row')){
        //if the row is selected...
        if (row.hasClass('selected')){
            //deselect it
            row.removeClass('selected')
        }
        else{
            //otherwise, select it
            row.addClass('selected')
        }
        //reassign the most recently selected row
        lastSelectedRow = row;
    }
}

function selectRowsBetweenIndexes(indexes,rows) {
    //sort the indexes in ascending order
    indexes.sort(function(a, b) {
        return a - b;
    });

    //for every row starting at the first index, until the second index...
    for (var i = indexes[0]; i <= indexes[1]; i++) {
        //select the row
        $(rows[i+1]).addClass('selected');
    }
}

function clearAll(rows) {
    //for all rows...
    for (var i = 0; i < rows.length; i++) {
        //deselect each row
        $(rows[i]).removeClass("selected");
    }
}

使用Ctrl +单击和Shift +单击选择多个HTML表行

5 个答案: