HTML< select> JQuery .change不工作 [英] HTML <select> JQuery .change not working
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问题描述
这是我的下拉菜单:
< DIV>
< form>
< select id ='yearDropdown'>
< c:forEach var =年items =$ {parkYears}>
< option value = / events.html?display_year = $ {years}< c:if test =$ {currentYear == years}> selected =selected< / c:if> > $ {年}< /选项>
< / c:forEach>
< / select>
< / form>
< / div>
这里是JavaScript
$(#yearDropdown)。change(function(){
alert('该值为'+ $(this).val());
} );
现在我只想让它工作,所以我可以添加功能。谢谢!
解决方案
该代码在语法上是正确的。很可能在错误的时间运行它。
当 DOM准备就绪时,您需要绑定该事件:
$(function(){/ * DOM ready * /
$(#yearDropdown b $ b alert('value'+ $(this).val());
});
});
或使用直播
:
$(#yearDropdown)。live('change',function(){
alert(' '+ $(this).val());
});
或使用委托
:
$(document.body).delegate('#yearDropdown','change',function(){
alert值为+ $(this).val());
});
或者,如果您使用jQuery 1.7 +
:
$(#yearDropdown)。on('change',function(){
alert ('value'+ $(this).val());
});
尽管如此,通常最好执行一次脚本浏览器已经完成渲染标记。
Alright I don't see why this isnt working. It seems pretty simple.
Here is my drop-down menu:
<div>
<form>
<select id='yearDropdown'>
<c:forEach var="years" items="${parkYears}">
<option value=/events.html?display_year=${years}<c:if test="${currentYear == years}">selected="selected"</c:if>>${years}</option>
</c:forEach>
</select>
</form>
</div>
and here is the JavaScript
$("#yearDropdown").change(function () {
alert('The option with value ' + $(this).val());
});
Right now I just want to get it working so I can add functionality. Thanks!
解决方案
That code is syntactically correct. Most likely running it at the wrong time.
You'll want to bind the event when the DOM is ready:
$(function(){ /* DOM ready */
$("#yearDropdown").change(function() {
alert('The option with value ' + $(this).val());
});
});
Or, use live
:
$("#yearDropdown").live('change', function() {
alert('The option with value ' + $(this).val());
});
Or, use delegate
:
$(document.body).delegate('#yearDropdown', 'change', function() {
alert('The option with value ' + $(this).val());
});
Or, if you're using jQuery 1.7+
:
$("#yearDropdown").on('change', function() {
alert('The option with value ' + $(this).val());
});
Nonetheless, it is usually best to execute script once the browser has finished rendering Markup.
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