我在下面的问题上需要专家的帮助,因为它超出了我在JavaScript编程方面的知识水平。
鉴于下面现有的JavaScript编码,我如何能够捎带并添加到现有编码上,以便为用户添加功能,使用他们的向上和向下箭头键滚动表格,同时滚动浏览(btw标题列豁免)它会突出显示所选行并更改其行颜色。
需要注意的是,如果选择了现有的表格行,并且我点击了我的向上或向下箭头键,它就会移动并突出显示上一行和下一行。这里的一些逻辑是我猜测需要找到行索引来执行此操作。就像我说的那样,它远远超出我所知道的范围。
非常感谢并非常感谢您的帮助。
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
tr.normal td {
color: black;
background-color: white;
}
tr.highlighted td {
color: white;
background-color: red;
}
</style>
</head>
<body>
<div id="results" class="scrollingdatagrid">
<table id="mstrTable" cellspacing="0" border="1">
<thead>
<tr>
<th>File Number</th>
<th>Date1</th>
<th>Date2</th>
<th>Status</th>
<th>Num.</th>
</tr>
</thead>
<tbody>
<tr>
<td>KABC</td>
<td>09/12/2002</td>
<td>09/12/2002</td>
<td>Submitted</td>
<td>1</td>
</tr>
<tr>
<td>KCBS</td>
<td>09/11/2002</td>
<td>09/11/2002</td>
<td>Lockdown</td>
<td>2</td>
</tr>
<tr>
<td>WFLA</td>
<td>09/11/2002</td>
<td>09/11/2002</td>
<td>Submitted</td>
<td>3</td>
</tr>
<tr>
<td>WTSP</td>
<td>09/15/2002</td>
<td>09/15/2002</td>
<td>In-Progress</td>
<td>4</td>
</tr>
</tbody>
</table>
</div>
<script type="text/javascript">
(
function() {
var trows = document.getElementById("mstrTable").rows;
for (var t = 1; t < trows.length; ++t) {
trow = trows[t];
trow.className = "normal";
trow.onclick = highlightRow;
}//end for
function highlightRow() {
for ( var t = 1; t < trows.length; ++t ) {
trow = trows[t];
if (trow != this) { trow.className = "normal" }
}//end for
this.className = (this.className == "highlighted")?"normal":"highlighted";
}//end function
}//end function
)();//end script
</script>
</body>
</html>
答案 0 :(得分:2)
这当然不是最佳选择,但由于您没有使用jQuery(或类似的库),因此会产生大量的跨浏览器开销。这应该向后兼容IE8。
的 Live Demo 强>
<强> HTML 强>
此处只更改tabindex
<table tabindex='0' id="mstrTable" cellspacing="0" border="1">
<强> JS 强>
//From: http://forrst.com/posts/JavaScript_Cross_Browser_Event_Binding-yMd
var addEvent = (function( window, document ) {
if ( document.addEventListener ) {
return function( elem, type, cb ) {
if ( (elem && !elem.length) || elem === window ) {
elem.addEventListener(type, cb, false );
}
else if ( elem && elem.length ) {
var len = elem.length;
for ( var i = 0; i < len; i++ ) {
addEvent( elem[i], type, cb );
}
}
};
}
else if ( document.attachEvent ) {
return function ( elem, type, cb ) {
if ( (elem && !elem.length) || elem === window ) {
elem.attachEvent( 'on' + type, function() { return cb.call(elem, window.event) } );
}
else if ( elem.length ) {
var len = elem.length;
for ( var i = 0; i < len; i++ ) {
addEvent( elem[i], type, cb );
}
}
};
}
})( this, document );
//derived from: http://stackoverflow.com/a/10924150/402706
function getpreviousSibling(element) {
var p = element;
do p = p.previousSibling;
while (p && p.nodeType != 1);
return p;
}
//derived from: http://stackoverflow.com/a/10924150/402706
function getnextSibling(element) {
var p = element;
do p = p.nextSibling;
while (p && p.nodeType != 1);
return p;
}
;(function() {
var trows = document.getElementById("mstrTable").rows;
for (var t = 1; t < trows.length; ++t) {
trow = trows[t];
trow.className = "normal";
trow.onclick = highlightRow;
}//end for
function highlightRow() {
for ( var t = 1; t < trows.length; ++t ) {
trow = trows[t];
if (trow != this) { trow.className = "normal" }
}//end for
this.className = (this.className == "highlighted")?"normal":"highlighted";
}//end function
addEvent(document.getElementById('mstrTable'), 'keydown', function(e){
var key = e.keyCode || e.which;
if((key === 38 || key === 40) && !e.shiftKey && !e.metaKey && !e.ctrlKey && !e.altKey){
var highlightedRows = document.querySelectorAll('.highlighted');
if(highlightedRows.length > 0){
var highlightedRow = highlightedRows[0];
var prev = getpreviousSibling(highlightedRow);
var next = getnextSibling(highlightedRow);
if(key === 38 && prev && prev.nodeName === highlightedRow.nodeName){//up
highlightedRow.className = 'normal';
prev.className = 'highlighted';
} else if(key === 40 && next && next.nodeName === highlightedRow.nodeName){ //down
highlightedRow.className = 'normal';
next.className = 'highlighted';
}
}
}
});
})();//end script
答案 1 :(得分:2)
我认为这实际上不需要那么久 - 你只需要保留当前突出显示的行的索引。
这只在Chrome上测试过(我没有IE),但它应该有用。
(function() {
/**
* Gets the tr at the specified row or column
*/
var tbody = document.getElementsByTagName('tbody')[0];
function getRow(row) {
return tbody.getElementsByTagName('tr')[row];
}
// store these so we won't have to keep recalculating
var numRows = tbody.getElementsByTagName('tr').length;
// index of the currently highlighted row
var curRow = 0;
// highlight the initially highlighted cell
getRow(curRow).className = 'highlighted';
// listen for keydown event
if (addEventListener) {
window.addEventListener('keydown',keydownHandler, false);
} else if (window.attachEvent) {
window.attachEvent('onkeydown', keydownHandler);
}
// handle keydown event
function keydownHandler (evt) {
// return the old cell to normal
getRow(curRow).className = 'normal';
// increment/decrement the position of the current cell
// depending on the key pressed
if (evt.keyCode == 38 && curRow > 0) // up
curRow--;
else if (evt.keyCode == 40 && curRow < numRows-1) // down
curRow++;
// update the new cell
getRow(curRow).className = 'highlighted';
}
})();//end script
答案 2 :(得分:1)
我使用JQuery here on JSBin
创建了一个演示一般来说,我们有两项任务:
要突出显示“点击”行,我使用此代码
$("#mstrTable tr").click(function(evt){
var element = $(evt.target);
var tableElement = element.parents('table');
tableElement.find('tr').removeClass('highlighted');
element.parents('tr').addClass('highlighted');
});
要选择next / prev行,我会在tr
内没有tbody
的情况下使用jQuery tree traversal function。请注意,左,右,上,下箭头的keyCode
分别为37,39,38,40。
$(document).keypress(function(evt){
var highlightedRow = $("#mstrTable .highlighted");
if (highlightedRow.length > 0) // table cell is selected
{
var tbodyElement = highlightedRow.parents('tbody');
var trElements = tbodyElement.find('tr');
var nextElement = highlightedRow.next('tr');
var prevElement = highlightedRow.prev('tr');
trElements.removeClass("highlighted");
switch(evt.keyCode)
{
case 40:
if(nextElement.length)
{
nextElement.addClass('highlighted');
}
else if (trElements.length)
{
$(trElements[0]).addClass('highlighted');
}
break;
case 38:
if(prevElement.length)
{
prevElement.addClass('highlighted');
}
else if (trElements.length)
{
$(trElements[trElements.length - 1]).addClass('highlighted');
}
break;
}
}
});
答案 3 :(得分:0)
这是完整的解决方案,它选择表中的行,就像Windows文件选择一样。
将类multiSelect添加到您的表中,然后将此代码放在JS文件中
$(document).ready(function() {
var selectionPivot;
// code for selected rows.
$('.multiSelect tbody').on( 'click', 'tr', function (e) {
var tbodyElement = $(this).parents('tbody');
var trElements = tbodyElement.find('tr');
if(!e.ctrlKey && (!e.shiftKey) ){
trElements.removeClass("row_selected");
selectionPivot=$(this);
}
if(e.shiftKey){
var bot = Math.min(selectionPivot[0].rowIndex, $(this)[0].rowIndex);
var top = Math.max(selectionPivot[0].rowIndex, $(this)[0].rowIndex);
trElements.removeClass("row_selected");
for(var i=bot; i<=top; i++){
trElements[i-1].className+=" row_selected";
}
}
else {
selectionPivot=$(this);
trElements.removeClass("focus");
$(this).addClass('focus');
if ( $(this).hasClass('row_selected') ) {
$(this).removeClass('row_selected');
}
else {
$(this).addClass('row_selected');
}
}
});
$(document).keypress(function(evt){
if(evt.shiftKey){
var highlightedRow = $(".multiSelect .focus");
if (highlightedRow.length > 0) // table cell is selected
{
var tbodyElement = highlightedRow.parents('tbody');
var trElements = tbodyElement.find('tr');
var nextElement = highlightedRow.next('tr');
var prevElement = highlightedRow.prev('tr');
trElements.removeClass("focus");
switch(evt.keyCode)
{
case 40:
if(nextElement.length)
{
nextElement.addClass('row_selected');
nextElement.addClass('focus');
}
else if (trElements.length)
{
$(trElements[0]).addClass('row_selected');
$(trElements[0]).addClass('focus');
}
break;
case 38:
if(prevElement.length)
{
prevElement.addClass('row_selected');
prevElement.addClass('focus');
}
else if (trElements.length)
{
$(trElements[trElements.length - 1]).addClass('row_selected');
$(trElements[trElements.length - 1]).addClass('focus');
}
break;
}
}
}
});
});