仅第二次进行onselect工作 [英] onselect work from the second time only
本文介绍了仅第二次进行onselect工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有下面的代码按需工作，但是on select仅在第二次选择更改中起作用.
I have below code working as desired but the on select works only from the second select change.
有什么解决办法吗?
<html>
<head>
<title>select & select</title>
<script type='text/javascript'>
var select2data = {
'English': [['One', 1], ['Two', 2], ['Three', 3]],
'Spanish': [['Uno', 1], ['Dos', 2], ['Tres', 3]]
};
function change_second_select(){
var sel1 = document.getElementById('select1')
, sel2 = document.getElementById('select2');
sel1.onchange = function() {
var os = select2data[sel1.value]; // Get the options required by select1.
if (os) {
sel2.options.length = 0; // Clear the options for select2.
for (var i=0; i<os.length; i++) {
var o = new Option(os[i][0], os[i][1]);
try { // Add each option, allowing for browser differences.
sel2.add(o);
} catch (ex) {
sel2.add(o, null);
}
}
sel2.selectedIndex = 0;
}
return true;
};
}
</script>
<select id="select1" onchange="change_second_select();">
<option value="English">English</option>
<option value="Spanish">Spanish</option>
</select>
<select id="select2">
</select>
</head>
</html>
推荐答案
将您的change_on_select更改为以下内容:
Change your change_on_select to as below:
工作示例@ http://jsfiddle.net/3dCyw/1/
function change_second_select(){
var sel1 = document.getElementById('select1')
, sel2 = document.getElementById('select2');
var os = select2data[sel1.value]; // Get the options required by select1.
if (os) {
sel2.options.length = 0; // Clear the options for select2.
for (var i=0; i<os.length; i++) {
var o = new Option(os[i][0], os[i][1]);
try { // Add each option, allowing for browser differences.
sel2.add(o);
} catch (ex) {
sel2.add(o, null);
}
}
sel2.selectedIndex = 0;
}
return true;
}
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