如何获取此选项框的值并将其放入javascript变量中
这是我的代码,我想获取所选选项的值,但如何获取如何获取此选项框的值并将其放入javascript变量中,javascript,php,html,ajax,web,Javascript,Php,Html,Ajax,Web,这是我的代码,我想获取所选选项的值,但如何获取 <?php $sql = "SELECT * FROM `category`"; $category = mysql_query($sql); ?> <select> <?php while ($row = mysql_fetch_array($category)) { echo "<option id='ca
<?php
$sql = "SELECT * FROM `category`";
$category = mysql_query($sql); ?>
<select>
<?php
while ($row = mysql_fetch_array($category)) {
echo "<option id='cat' value='" . $row['catid'] ."'>" . $row['catname'] ."</option>";
}
?>
</select>
使用jQuery(),
假设你有:
<select name="garden" multiple="multiple">
<option>Flowers</option>
<option selected="selected">Shrubs</option>
<option>Trees</option>
<option selected="selected">Bushes</option>
<option>Grass</option>
<option>Dirt</option>
</select>
<div></div>
<script>
$( "select" )
.change(function() {
var str = "";
$( "select option:selected" ).each(function() {
str += $( this ).text() + " ";
});
$( "div" ).text( str );
})
.trigger( "change" );
</script>
花
灌木丛
树
灌木丛
草
污垢
$(“选择”)
.change(函数(){
var str=“”;
$(“选择选项:选定”)。每个(函数(){
str+=$(this).text()+“”;
});
$(“div”).text(str);
})
.触发(“变更”);
试试这个纯javascript解决方案(不带jQuery)
HTML(通过属性id更改当前的SELECT HTML标记)
可能重复的
<select id="myselect">
var myvariable = null;
document.getElementById('myselect').onchange = function(e) {
myvariable = this.options[this.selectedIndex].value;
};