The onChange listener of select does not work
1. The onChange listener of select does not work. Solution to the problem
<selectclass="form-control"name="productName"id="product_name">
< option value = "" > Please select </ option >
</select>
Under normal circumstances, we directly set the following methods to listen, and we will find that the onChange event does not listen to the selection operation of the select control
<scripttype="text/javascript">
$("#product_name").change(function(){
$("#product_type option[value='"+$('#product_name option:selected').val()+"']").prop("selected",true);
});
</script>
The solution is usually to put it in the page loading initialization $(document).ready( function (){});, this part of the code mainly declares the method of "listening events" after the page is loaded
<scripttype="text/javascript">
$(document).ready(function() {
$("#product_name").change(function(){
$("#product_type option[value='"+$('#product_name option:selected').val()+"']").prop("selected",true);
});
});
<script>
2. Dynamically clear the option options in the select control
$("#product_name").empty();
3. Dynamically add the option option in the select control
for(var a=0; a<result.length; a++){
$("#product_name").append("<option value='"+result[a].id+"'>"+result[a].productName+"</option>");
$("#product_type").append("<option value='"+result[a].id+"'>"+result[a].productNum+"</option>");
}
4. Dynamically modify the option method selected in the select control
$("#product_type option[value='"+$('#product_name option:selected').val()+"']").prop("selected",true);
原文链接：http://blog.csdn.net/ahou2468/article/details/72954974