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Home Backend Development PHP Tutorial 通过读取数据库+循环的方法做了一个select下拉列表,但始终无法通过js赋予指定值,怎么解决?(撒分,不够另补)

通过读取数据库+循环的方法做了一个select下拉列表,但始终无法通过js赋予指定值,怎么解决?(撒分,不够另补)

Jun 23, 2016 pm 02:19 PM

想了想,这个和js其实不怎么相关,还是php问题。

问题背景:该页面左边是一些记录的列表,右边是很多空框,供填入一些信息,之后保存。然后点击左边记录的其中一项,相关信息就能在右边出现。上述功能我都已经实现了。
问题:右边很多空框中有一项是select下拉列表进行选择哪辆车。我的做法是从数据库中读取carNum(integer类型),以此作为select中option的value,而显示的值是数据库中对应该车辆的licenseNum(车牌号),上述用php循环的方法查询并且实现的。但我用js指定该id的select的值时,该select一点反应没有。我把这个select换成确定的select(即去除php循环,而是在htm中直接设定value和选项名称),则js可以指定该select的值,并显示出该值。

但我希望能循环设置该select,而且js能指定该值(显然,这样的话就可以动态显示了。)
该如何解决呢? 撒分,不够的话回帖或者私信给我,可另补。

直接上代码:

<!---下面是htm直接设定html的select的代码----><select id="showOrder_21" name="truck" class="dropdown" style="margin-left:0px !important; border:1px solid #BABABA !important;">        <option  value ="1">QAZ123</option>        <option  value ="2">WSX234</option>        <option  value ="3">EDC345</option>        <option  value ="4">TGB456</option></select></td>
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下面是采用循环的方式实现的select:
 <select id="showOrder_21" name="truck" class="dropdown" style="margin-left:0px !important; border:1px solid #BABABA !important;"><?php $query = "select * from transport.truck order by carNum";$data = getAll($query);foreach($data as $each){?><option value="<?php  echo $each['carNum'];  ?> "><?php echo $each['licNum'];?></option><?php } ?></select></td>
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下面是我用的js 部分:
<script type="text/javascript">    $(document).ready(function(){        $(".LeftTask").click(function(){                   $(this).css("background","#A8A8A8");            $(this).siblings().css("background","white");            var orderID = $(this).find('input').val();            $.ajax({                type:"get",                url:"main/ajax.php",                data:{                    orderID:orderID                },                success:function(msg){                    msg = eval("("+msg+")"); <!---当中删除大量不相关的显示--->                    $("#showOrder_21").val(msg.truck);              }        });    });});    </script>
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大牛们,求指导!!!
怎么解决这个问题呢?求关键代码片段或网上案例,万分感谢!!!


回复讨论(解决方案)

$(".LeftTask").click(function(){

改成

$(".LeftTask").live("click",function(){  ....... 

后者的优势是可以"即使某dom节点是页面载入完成之后生成的,也能绑定事件".

参阅jquery手册.

$(".LeftTask").click(function(){

改成

$(".LeftTask").live("click",function(){  ....... 

后者的优势是可以"即使某dom节点是页面载入完成之后生成的,也能绑定事件".

参阅jquery手册.

哇,你来了啊,欢迎欢迎。立马试。
谢谢啊。

另外更好的办法是在动态生成的html标签中使用onclick="xxxxxxxx()"这种形式  好处是不像live那样耗费浏览器资源

$(".LeftTask").click(function(){

改成

$(".LeftTask").live("click",function(){  ....... 

后者的优势是可以"即使某dom节点是页面载入完成之后生成的,也能绑定事件".

参阅jquery手册.

出错信息:
Line: 408
Error: Object doesn't support property or method 'live'

可能是我在head里面设置的版本问题。
前两天你给我的checkbox中的attr也出错了,最后换成最新版本中prop,才最终成功。


中间多了个空格!

变成了

不出问题才怪呢


中间多了个空格!

变成了

不出问题才怪呢


版主英明,刚才我自己查了很久,也同时发现这个问题。

这样,版主指明问题,再看我一眼一贯支持。

结贴,两位都是熟人,你看这样可否:
版主65分,再看我一眼35分如何?

这样,版主指明问题,再看我一眼一贯支持。

结贴,两位都是熟人,你看这样可否:
版主65分,再看我一眼35分如何?


都是熟人,就暂且这样。有觉得不满意的,可回帖或私信给我。

一再感谢大牛们帮助!!!

分数都是浮云,无所谓的.... 有问题继续交流.... 版大确实犀利 一眼看出问题所在~

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