search
HomeBackend DevelopmentPHP 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,如何解决?(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)
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:

<br /><!---下面是htm直接设定html的select的代码----><br /><select id="showOrder_21" name="truck" class="dropdown" style="margin-left:0px !important; border:1px solid #BABABA !important;"><br />        <option  value ="1">QAZ123</option><br />        <option  value ="2">WSX234</option><br />        <option  value ="3">EDC345</option><br />        <option  value ="4">TGB456</option><br /></select></td><br />


下面是采用循环的方式实现的select:
<br /> <select id="showOrder_21" name="truck" class="dropdown" style="margin-left:0px !important; border:1px solid #BABABA !important;"><br /><?php <br />$query = "select * from transport.truck order by carNum";<br />$data = getAll($query);<br />foreach($data as $each)<br />{<br />?><br /><option value="<?php  echo $each['carNum'];  ?> "><?php echo $each['licNum'];?></option><br /><?php } ?><br /></select></td><br /><br />



下面是我用的js 部分:

<br><script><br />    $(document).ready(function(){<br />        $(".LeftTask").click(function(){<br />       <br />            $(this).css("background","#A8A8A8");<br />            $(this).siblings().css("background","white");<br />            var orderID = $(this).find('input').val();<br />            $.ajax({<br />                type:"get",<br />                url:"main/ajax.php",<div class="clear">
                 
              
              
        
            </script>
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How do you create and use an interface in PHP?How do you create and use an interface in PHP?Apr 30, 2025 pm 03:40 PM

The article explains how to create, implement, and use interfaces in PHP, focusing on their benefits for code organization and maintainability.

What is the difference between crypt() and password_hash()?What is the difference between crypt() and password_hash()?Apr 30, 2025 pm 03:39 PM

The article discusses the differences between crypt() and password_hash() in PHP for password hashing, focusing on their implementation, security, and suitability for modern web applications.

How can you prevent Cross-Site Scripting (XSS) in PHP?How can you prevent Cross-Site Scripting (XSS) in PHP?Apr 30, 2025 pm 03:38 PM

Article discusses preventing Cross-Site Scripting (XSS) in PHP through input validation, output encoding, and using tools like OWASP ESAPI and HTML Purifier.

What is autoloading in PHP?What is autoloading in PHP?Apr 30, 2025 pm 03:37 PM

Autoloading in PHP automatically loads class files when needed, improving performance by reducing memory use and enhancing code organization. Best practices include using PSR-4 and organizing code effectively.

What are PHP streams?What are PHP streams?Apr 30, 2025 pm 03:36 PM

PHP streams unify handling of resources like files, network sockets, and compression formats via a consistent API, abstracting complexity and enhancing code flexibility and efficiency.

What is the maximum size of a file that can be uploaded using PHP ?What is the maximum size of a file that can be uploaded using PHP ?Apr 30, 2025 pm 03:35 PM

The article discusses managing file upload sizes in PHP, focusing on the default limit of 2MB and how to increase it by modifying php.ini settings.

What is Nullable types in PHP ?What is Nullable types in PHP ?Apr 30, 2025 pm 03:34 PM

The article discusses nullable types in PHP, introduced in PHP 7.1, allowing variables or parameters to be either a specified type or null. It highlights benefits like improved readability, type safety, and explicit intent, and explains how to declar

What is the difference between the unset() and unlink() functions ?What is the difference between the unset() and unlink() functions ?Apr 30, 2025 pm 03:33 PM

The article discusses the differences between unset() and unlink() functions in programming, focusing on their purposes and use cases. Unset() removes variables from memory, while unlink() deletes files from the filesystem. Both are crucial for effec

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function