选择下拉选项时如何触发javascript [英] how to trigger javascript when a dropdown option is selected
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问题描述
我对汽车品牌和型号的两个下拉框,当一个让选择我需要的所有车型在未来的框来显示.截至目前,使用以下代码,当单击下拉列表时,模型就会显示出来.
I have two dropdown boxes for car makes and models, when a make is selected i need all its models to show in the next box. As of now using the following code the models show up when the dropdown is clicked.
window.onmousedown = function(e){
this.id = e.target.id;
if(this.id == "vehicle_makes"){
var make = document.getElementById("vehicle_makes").value;
ajaxCall(make);
}
}
但是,我需要从下拉菜单中选择一个选项而不是打开下拉菜单时触发javascript.
However i need the javascript to trigger when an option from the dropdown is selected rather than when the drop down is opened.
这也是html-和一些php
here also is the html - with some php
<div class="vehicle-search-wrap">
<form method="get" id="searchform" action="<?php bloginfo('url'); ?>">
<div>
<select id="vehicle_makes" name="s">
<?php
foreach($makes as $make){ //put all makes in dropdown
echo "<option value='". $make ."'>". $make ."</option>";
}
?>
</select>
<select id="model_drop" name="vmodels">
<?php
//nothing to start
?>
</select>
<input type="submit" value="Search Vehicle" />
</div>
</form>
</div>
推荐答案
使用selectbox的 onchange
事件.
use the onchange
event of selectbox.
这是演示
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