Javascript 改进代码的方法。我也尝试过类似的方法,但都不管用。另外,我的变量不是数组,而是字符串。 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org
改进代码的方法。我也尝试过类似的方法,但都不管用。另外,我的变量不是数组,而是字符串。Javascript 改进代码的方法。我也尝试过类似的方法,但都不管用。另外,我的变量不是数组,而是字符串。 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org,javascript,php,Javascript,Php,改进代码的方法。我也尝试过类似的方法,但都不管用。另外,我的变量不是数组,而是字符串。 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <title>Planner</title> <meta name="keywords" content="" />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<title>Planner</title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<script type="text/javascript">
// Variables we need
var previous = new Array();
var lastClicked = '';
// We are going to attach event listeners, no code at the bottom or anything hard coded...
function addEvent(obj, evType, fn)
{
if(obj.addEventListener)
{
obj.addEventListener(evType, fn, false);
return true;
}
else if(obj.attachEvent)
{
var r = obj.attachEvent('on' + evType, fn);
return r;
}
else
{
return false;
}
}
// Let's begin when the DOM is ready
addEvent(window, 'load', begin);
// Attach the handlers to our selects
function begin()
{
addSelect('numbers');
addSelect('sm');
addSelect('sm2');
}
// We add a couple of handlers to each
function addSelect(id)
{
var sel = document.getElementById(id);
addEvent(sel, 'click', whichElement);
addEvent(sel, 'click', addRemoveClicked);
}
// Find which element we are looking at on this click
function whichElement(e)
{
if(!e)
{
var e = window.event;
}
if(e.target)
{
lastClicked = e.target;
}
else if(e.srcElement)
{
lastClicked = e.srcElement;
}
if(lastClicked.nodeType == 3) // Safari bug
{
lastClicked = lastClicked.parentNode;
}
}
// Make sure we are displaying the correct items
function addRemoveClicked(e)
{
if(!previous[this.id])
{
previous[this.id] = new Array();
}
// Remember what has been used
if(previous[this.id][lastClicked.value] == 1)
{
previous[this.id][lastClicked.value] = 0;
}
else
{
previous[this.id][lastClicked.value] = 1;
}
var selectBox = document.getElementById(this.id);
// Add correct highlighting
for(var i = 0; i < selectBox.options.length; i++)
{
selectBox.options[i].selected = '';
if(previous[this.id][selectBox.options[i].value] == 1)
{
selectBox.options[i].selected = 'selected';
}
}
}
</script>
<select name="numbers[]" id="numbers" multiple="multiple" size="6">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
</select>
<select name="classes[]" id="classes" multiple="multiple" size="10">
<?PHP echo $classCode ?>
</select>
<input type="submit" name="submit" value="Proceed to Next Step" />
</form>
</body></html>
<option value="1">201 Intro to Financial Accounting</option>
<option value="2">202 Intro to Managerial Accounting</option>
<option value="3">130 Intro to Microeconomics</option>
<option value="4">320 Principles Bus Finance</option>
<option value="5">300 Management, & Human Behavior</option>
<?PHP
echo "
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\">
<head>
<title>Planner</title>
<meta name=\"keywords\" content=\"\" />
<meta name=\"description\" content=\"\" />
<script type=\"text/javascript\">
// Variables we need
var previous = new Array();
var lastClicked = '';
// We are going to attach event listeners, no code at the bottom or anything hard coded...
function addEvent(obj, evType, fn)
{
if(obj.addEventListener)
{
obj.addEventListener(evType, fn, false);
return true;
}
else if(obj.attachEvent)
{
var r = obj.attachEvent('on' + evType, fn);
return r;
}
else
{
return false;
}
}
// Let's begin when the DOM is ready
addEvent(window, 'load', begin);
// Attach the handlers to our selects
function begin()
{
addSelect('numbers');
addSelect('sm');
addSelect('sm2');
}
// We add a couple of handlers to each
function addSelect(id)
{
var sel = document.getElementById(id);
addEvent(sel, 'click', whichElement);
addEvent(sel, 'click', addRemoveClicked);
}
// Find which element we are looking at on this click
function whichElement(e)
{
if(!e)
{
var e = window.event;
}
if(e.target)
{
lastClicked = e.target;
}
else if(e.srcElement)
{
lastClicked = e.srcElement;
}
if(lastClicked.nodeType == 3) // Safari bug
{
lastClicked = lastClicked.parentNode;
}
}
// Make sure we are displaying the correct items
function addRemoveClicked(e)
{
if(!previous[this.id])
{
previous[this.id] = new Array();
}
// Remember what has been used
if(previous[this.id][lastClicked.value] == 1)
{
previous[this.id][lastClicked.value] = 0;
}
else
{
previous[this.id][lastClicked.value] = 1;
}
var selectBox = document.getElementById(this.id);
// Add correct highlighting
for(var i = 0; i < selectBox.options.length; i++)
{
selectBox.options[i].selected = '';
if(previous[this.id][selectBox.options[i].value] == 1)
{
selectBox.options[i].selected = 'selected';
}
}
}
</script>
</head>
<body>
<form name=\"takenClasses\" method=\"post\" action=\"process.php\">
<select name=\"numbers[]\" id=\"numbers\" multiple=\"multiple\" size=\"6\">
<option value=\"1\">One</option>
<option value=\"2\">Two</option>
<option value=\"3\">Three</option>
<option value=\"4\">Four</option>
<option value=\"5\">Five</option>
</select>
<select name=\"classes[]\" id=\"classes\" multiple=\"multiple\" size=\"20\">
";
while($row=mysql_fetch_array($result)) {
echo "<option value='$row[id]'>$row[course_name] </option>\n";
}
echo "
</select>
<input type=\"submit\" name=\"submit\" value=\"Proceed to Next Step\" />
</form>
</body></html>";?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Planner</title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<script type="text/javascript">
// Variables we need
var previous = new Array();
var lastClicked = '';
// We are going to attach event listeners, no code at the bottom or anything hard coded...
function addEvent(obj, evType, fn)
{
if(obj.addEventListener)
{
obj.addEventListener(evType, fn, false);
return true;
}
else if(obj.attachEvent)
{
var r = obj.attachEvent('on' + evType, fn);
return r;
}
else
{
return false;
}
}
// Let's begin when the DOM is ready
addEvent(window, 'load', begin);
// Attach the handlers to our selects
function begin()
{
addSelect('numbers');
addSelect('sm');
addSelect('sm2');
}
// We add a couple of handlers to each
function addSelect(id)
{
var sel = document.getElementById(id);
addEvent(sel, 'click', whichElement);
addEvent(sel, 'click', addRemoveClicked);
}
// Find which element we are looking at on this click
function whichElement(e)
{
if(!e)
{
var e = window.event;
}
if(e.target)
{
lastClicked = e.target;
}
else if(e.srcElement)
{
lastClicked = e.srcElement;
}
if(lastClicked.nodeType == 3) // Safari bug
{
lastClicked = lastClicked.parentNode;
}
}
// Make sure we are displaying the correct items
function addRemoveClicked(e)
{
if(!previous[this.id])
{
previous[this.id] = new Array();
}
// Remember what has been used
if(previous[this.id][lastClicked.value] == 1)
{
previous[this.id][lastClicked.value] = 0;
}
else
{
previous[this.id][lastClicked.value] = 1;
}
var selectBox = document.getElementById(this.id);
// Add correct highlighting
for(var i = 0; i < selectBox.options.length; i++)
{
selectBox.options[i].selected = '';
if(previous[this.id][selectBox.options[i].value] == 1)
{
selectBox.options[i].selected = 'selected';
}
}
}
</script>
</head>
<body>
<form name="takenClasses" method="post" action="process.php">
<select name="numbers[]" id="numbers" multiple="multiple" size="6">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
</select>
<select name="classes[]" id="classes" multiple="multiple" size="20">
<?php echo $classCode; ?>
</select>
<input type="submit" name="submit" value="Proceed to Next Step" />
</form>
</body></html>