<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
select {width: 75pxfont-size: 20pxcolor:#000000font-family: '宋体'}
#main {width: 400pxheight: 20pxmargin:0 autoword-spacing: 0px}
#main select { color:green}
#main select[name=S1] { color:orange}
</style>
</head>
<body>
<div id="main"></div>
<script>
initSelects()
function initSelects() {
var data = {
10:[
[12,110,190,'ESA1210'],
[16,150,230,'ESA1610'],
[20,190,270,'ESA2010']
],
20: [
[24,230,310,'ESA2410'],
[28,270,350,'ESA2810'],
[32,310,390,'ESA3210'],
[36,350,430,'ESA3610']
],
40: [
[40,390,470,'ESA4010'],
[44,430,510,'ESA4410'],
[48,470,550,'ESA4810'],
[52,510,590,'ESA5210']
]
}
var selectNames = ['S1', 'S2', 'S3', 'S4', 'S5']
var sunits = ['mm', 'n', 'mm', 'mm', '']
var main = document.getElementById('main')
var S1 = document.createElement('select')
S1.name = selectNames[0]
S1.onchange = function() {
for(var i = 0i <SG2s.lengthi++)
SG2s[i].options.length = 0
data[this.value].forEach(function(line) {
for(var i = 0i <SG2s.lengthi++) {
var atom = line[i]
SG2s[i].options.add( new Option(atom + sunits[i], atom) )
}
})
}
for(var y in data)
S1.options.add(new Option(y + select[0], y))
main.append(S1)
var SG2s = []
var names
for(var i = 0i <4i++) {
var s = document.createElement('select')
s.name = selectNames[i + 1]
s.onchange = function() {
for(var i = 0i <SG2s.lengthi++)
SG2s[i].selectedIndex = this.selectedIndex
}
SG2s.push(s)
main.append(s)
}
S1.onchange()
}
</script>
</body>
</html>
那你要把提交的再次值赋给下接框，类似以下代码。你最初始的html。
<select name='select_demo'>
<option value='1'>中介</option>
<option value='2'>其他</option>
</select>
假定前台选择了2,其他，我假定你html与php混着写的。
$select_demo = $_POST['select_demo']
$one = ''
$two = ''
switch($select_demo){
case '1':$one = 'selected'break
case '2':$two = 'selected'break
}
===========
<select name='select_demo'>
<option value='1' <?php echo $one ?>>中介</option>
<option value='2' <?php echo $two ?>>其他</option>
</select>
==============
就是将选中的option的值标记为selected.
以上代码是示意性原理代码。望理解后写更好的代码。最好不要抄，因为这样判断太笨了。
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<html>hello</html>|<a>abcd</a>
abc|123|<html>ddd
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^[^<>`~!/@\#}$%:)(_^{&*=|'+]+$
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(\[(\w+)\s*(([\w]*)=('|")?([a-zA-Z0-9|:|\/|=|-|.|\?|&]*)(\5)?)*\])([a-zA-Z0-9|:|\/|=|-|.|\?|&|\s]+)(\[\/\2\])
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[a]whatever[/b] | [a var1=something var2=somethingelse]whatever[/a] | [a]whatever[a]
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abc|123|<html>ddd
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src[^>]*[^/].(?:jpg|bmp|gif)(?:\"|\')
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src="../images/image.jpg" | src="http://domain.com/images/image.jpg" | src='d:\w
不匹配
src="../images/image.tif" | src="cid:value"
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/\*[\d\D]*?\*/
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不匹配
*/ anything here /* | anything between 2 seperate comments | \* *\
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<[a-zA-Z]+(\s+[a-zA-Z]+\s*=\s*("([^"]*)"|'([^']*)'))*\s*/>
匹配
<img src="test.gif"/>
不匹配
<img src="test.gif">| <img src="test.gif"a/>
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