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我是一名學生,剛接觸編程,想通過嘗試學習來學習Javascript。我正在做一個練習,要求我在鼠標拖動時突出顯示錶格單元格。我得到它的工作,但我有問題找出如何通過拖動任何方向(而不僅僅是從X到Y方向)來突出顯示單元格。下面的代碼顯示了它如何從X到Y方向工作;我希望它在用戶將鼠標從Y方向拖動到X方向時執行相同操作。例如,考慮A, B, C, D, G, H
和I
作爲表格單元格。JQuery表單元格選擇腳本
A B C
D E F
G H I
從A至E拖動沿着對角線鼠標選擇細胞A,B,D & E
。我想我,H,F,E要在拖動鼠標選擇從我到E.
這裏是工作代碼:
$(function() {
var isMouseDown = false,
isHighlighted;
var mouseDownRowX = 0;
var mouseDownRowY = 0;
$("#assayPlateTable2 td.dragShadow")
.click(function() {
$("#assayPlateTable2 td").each(function() {
var currClass = $(this).attr('class');
if(currClass == 'dragShadow') {
$(this).css('backgroundColor', 'none');
}
});
var currClass = $(this).attr('class');
if(currClass == 'dragShadow') {
$(this).css('backgroundColor', '#dff0de');
}
currRow = $(this).parent().parent().children().index($(this).parent());
})
.mousedown(function() {
isMouseDown = true;
mouseDownRowX = $(this).parent().parent().children().index($(this).parent());
mouseDownRowY = $(this).parent().children().index($(this));
return false; // prevent text selection
})
.mouseover(function() {
//alert('mouse over' + isMouseDown);
if (isMouseDown) {
currRow = $(this).parent().parent().children().index($(this).parent());
currCol = $(this).parent().children().index($(this));
//var currRow = 1;
//var currCol = 1;
$("#assayPlateTable2 td").each(function() {
_mouseDownRowX = $(this).parent().parent().children().index($(this).parent());
_mouseDownRowY = $(this).parent().children().index($(this));
if(_mouseDownRowX >=
mouseDownRowX && _mouseDownRowX <= currRow && _mouseDownRowY
>= mouseDownRowY && _mouseDownRowY <= currCol) {
var currClass = $(this).attr('class');
if(currClass == 'dragShadow') {
$(this).css('backgroundColor', '#dff0de');
}
//alert("setting==>" + currRow + "," + currCol);
} else {
var currClass = $(this).attr('class');
if(currClass == 'dragShadow') {
$(this).css('backgroundColor', 'none');
}
}
});
for(var i = mouseDownRowX; i < _mouseDownRowX; i++) {
for(var j = mouseDownRowY; j < _mouseDownRowY; j++) {
}
}
//$(this).parent().toggleClass("highlighted", isHighlighted);
//$(this).parent().css('backgroundColor', '#dff0de');
}
})
.bind("selectstart", function() {
return false;
})
$(document)
.mouseup(function() {
isMouseDown = false;
});
});
</script>
HTML:
<table cellpadding="0" cellspacing="0" id="assayPlateTable2">
<tr>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
</tr>
<tr>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
<td class="dragShadow"> </td>
</tr>
<tr>...</tr> and so on
</table>