js method to move items up and down in Select list_javascript skills-JS Tutorial-php.cn

js method to move items up and down in Select list_javascript skills

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Release： 2016-05-16 15:45:03

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The example in this article describes how to use js to move items up and down in the Select list. Share it with everyone for your reference. The details are as follows:

Here is the Js code for moving up and down items in the Select list, which can be sorted by hand. We have all seen it before, and friends who are engaged in WEB programming often use it.

The operation effect is as shown below:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-select-move-up-down-codes/

The specific code is as follows:

<html>
<head>
<title>Select列表各项上移和下移</title>
<script>
function move(index,to) {
var list = document.form.list;
var total = list.options.length-1;
if (index == -1) return false;
if (to == +1 && index == total) return false;
if (to == -1 && index == 0) return false;
var items = new Array;
var values = new Array;
for (i = total; i >= 0; i--) {
items[i] = list.options[i].text;
values[i] = list.options[i].value;
}
for (i = total; i >= 0; i--) {
if (index == i) {
list.options[i + to] = new Option(items[i],values[i + to], 0, 1);
list.options[i] = new Option(items[i + to], values[i]);
i--;
}
else {
list.options[i] = new Option(items[i], values[i]);
  }
}
list.focus();
}
function submitForm() {
var list = document.form.list;
var theList = "&#63;";
for (i = 0; i <= list.options.length-1; i++) { 
theList += "list" + list.options[i].value + "=" + list.options[i].text;
if (i != list.options.length-1) theList += "&";
}
location.href = document.form.action + theList;
}
</script>
</head>
<body>
<form method="GET" action="" name="form">
<table>
<tr>
<td align="middle">
<select name="list" size="4">
<option value="1">ASP</option>
<option value="2">PHP</option>
<option value="3">JSP</option>
<option value="4">JAVA</option>
</select><br><br>
<input type="button" value="submit" onClick="submitForm()">
</td>
<td valign="top">
<input type="button" value="↑" 
onClick="move(this.form.list.selectedIndex,-1)"><br><br>
<input type="button" value="↓"
onClick="move(this.form.list.selectedIndex,+1)">
</td>
</tr>
</table>
</form>
</body>
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.