[英]cannot display text onchange select option
I have 1 set of <select><option>
which is if I select 1 option by it value, it will display some text in <div>
. 我有一组
<select><option>
,如果我按它选择1个选项,它将在<div>
显示一些文本。
This is my code 这是我的代码
$(document).ready(function() { $('#selectcom').change(function() { opt = $(this).val(); if (opt == "comp_id") { $('#new_text').html('Varchar'); $('#size_row').html('20'); } else if (opt == "comp_name") { $('#new_text').html('Varchar'); $('#size_row').html('20'); } }); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <tr> <td> <select class="selectField" onChange="" id="selectcom"> <option value="">-- Select Field --</option> <option value="comp_id">comp_id</option> <option value="comp_name">comp_name</option> </select> </td> <td id="data_row"> <div id="new_text"></div> </td> <td id="size_row"> <div id="size_row"></div> </td> </tr>
The problem is I cannot display any output either varchar
text or 20
text with this code. 问题是我无法使用此代码显示
varchar
文本或20
文本的任何输出。 Anyone please help me. 有人请帮助我。 Thank you..
谢谢..
It works. 有用。 I would suspect that you haven't referenced jQuery before your script block/file.
我怀疑你在脚本块/文件之前没有引用jQuery。 Check the developer's console.
检查开发人员的控制台。 Does it display something like:
它是否显示如下内容:
Uncaught ReferenceError: $ is not defined
未捕获的ReferenceError:$未定义
Solution: Make sure your jQuery file is loaded before your script block/file. 解决方案:确保在脚本块/文件之前加载了jQuery文件。
Like: 喜欢:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="your-jsfile.js" type="text/javascript"></script>
Not like: 不喜欢:
<script src="your-jsfile.js" type="text/javascript"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
$(document).ready(function() { $('#selectcom').change(function() { opt = $(this).val(); if (opt == "comp_id") { $('#new_text').html('Varchar'); $('#size_row').html('20'); } else if (opt == "comp_name") { $('#new_text').html('Varchar'); $('#size_row').html('20'); } }); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <tr> <td> <select class="selectField" onChange="" id="selectcom"> <option value="">-- Select Field --</option> <option value="comp_id">comp_id</option> <option value="comp_name">comp_name</option> </select> </td> <td id="data_row"> <div id="new_text"></div> </td> <td id="size_row"> <div id="size_row"></div> </td> </tr>
Also, I recommend using a switch
statement. 另外,我建议使用
switch
语句。 I don't know about performance, but in my opinion, it improves readability. 我不了解性能,但在我看来,它提高了可读性。
$(document).ready(function() { $('#selectcom').change(function() { opt = $(this).val(); switch (opt) { case "comp_id": $('#new_text').html('Varchar'); $('#size_row').html('20'); break; case "comp_name": $('#new_text').html('Varchar'); $('#size_row').html('20'); break; } }); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <tr> <td> <select class="selectField" onChange="" id="selectcom"> <option value="">-- Select Field --</option> <option value="comp_id">comp_id</option> <option value="comp_name">comp_name</option> </select> </td> <td id="data_row"> <div id="new_text"></div> </td> <td id="size_row"> <div id="size_row"></div> </td> </tr>
First check console if you are getting some error due to other script also remove onChange="" if you are using direct jquery on change function, or use below approach. 首先检查控制台,如果由于其他脚本而导致某些错误,如果您在更改函数上使用直接jquery,则使用onChange =“”,或使用以下方法。
<tr>
<td>
<select class="selectField" onChange="changeMyValue(this.value)" id="selectcom">
<option value="">-- Select Field --</option>
<option value="comp_id">comp_id</option>
<option value="comp_name">comp_name</option>
</select>
</td>
<td id="data_row"><div id="new_text"></div></td>
<td id="size_row"><div id="size_row"></div></td>
</tr>
function changeMyValue(opt) {
if (opt=="comp_id")
{
$('#new_text').html('Varchar');
$('#size_row').html('20');
}
else if (opt == "comp_name")
{
$('#new_text').html('Varchar');
$('#size_row').html('20');
}
}
No enough information; 没有足够的信息; yet try to make sure you included jQuery reference in :
然后尝试确保您包含jQuery引用:
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
In case you did that , as I can see from jsfiddle. 如果你这样做,我可以从jsfiddle看到。 I suspect the css is showing the output in white...try to show some css code.
我怀疑css以白色显示输出...尝试显示一些css代码。
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