有没有一种方法可以通过使用 POST 变量来分配 Mako 模板内的图像 src?

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【中文标题】有没有一种方法可以通过使用 POST 变量来分配 Mako 模板内的图像 src?【英文标题】:Is there a possible way to assign the src of images inside a Mako template by using POST variables? 【发布时间】:2020-04-23 01:32:43 【问题描述】:

我目前被困在这个问题上,我似乎无法弄清楚......我已经使用 CherryPy 创建了一个小型 web 应用程序,并且我已经使用 Mako 作为 html 模板。一切都与一个包含汽车列表的 mysql 数据库相关联。我的问题如下:我正在使用 POST 表单从主页导航到汽车部分并指定某个汽车品牌。到达该页面后,我根据 POST 中的标准从数据库加载所有汽车。该变量包含从数据库中提取的所有行。然后我继续遍历行列表以显示每辆汽车的信息等,但我似乎无法找到将每张图片与其对应的汽车联系起来的方法。我的想法是生成我的 img 文件夹( ../img/cars/ )的路径并将其与汽车 ID + 文件扩展名连接起来,但这似乎不起作用......(我的图片保存为 1 .jpg、2.jpg 等 - 每个数字代表汽车 ID)。

index.html:

    <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <meta name="keywords" content="" />
    <meta name="description" content="" />
    <link href="../css/style.css" rel="stylesheet">




</head>

<body>

<div class="wrapper">



        <div class="topnav" id="myTopnav">

            <a href="index" id="logolink">
                <img  src="../img/logo_transparent.png"  >
            </a>

            <a href="index" id="link" class="active">Home</a>
            <a href="#news" id="link">News</a>
            <a href="contact" id="link">Contact</a>
            <a href="about" id="link">About</a>

          </div>



          <div class ="pageinfo">


            <img src="../img/slides/slide1.jpg" >
            <img src="../img/slides/slide2.jpg" >



          </div>




          <div class="pagecontent">

                <h1>Show cars by Category</h1>



                <div class="row">
                    <div class="column">
                      <div class="card">
                        <img src="../img/categories/hatchback.png"  style="width:200px; height:200px;">
                        <div class="container">
                          <h2>Hatchback</h2>
                          <p>Agile due its reduced size.</p>
                          <form action="displaybycategory" method="POST">
                            <p><button class="button" type="submit" name="category" value="hatchback" >Check available models</button></p>
                        </form>
                        </div>
                      </div>
                    </div>

                    <div class="column">
                      <div class="card">
                        <img src="../img/categories/suv.png"  style="width:200px; height:200px;">
                        <div class="container">
                          <h2>SUV</h2>
                          <p>Extremely versatile due to its power and utility.</p>
                          <form action="displaybycategory" method="POST">
                            <p><button class="button" type="submit" name="category" value="suv" >Check available models</button></p>
                        </form>
                        </div>
                      </div>
                    </div>

                    <div class="column">
                      <div class="card">
                        <img src="../img/categories/sedan.png"  style="width:200px; height:200px;">
                        <div class="container">
                          <h2>Sedan</h2>
                          <p>Enough space to fit all needs.</p>
                          <form action="displaybycategory" method="POST">
                            <p><button class="button" type="submit" name="category" value="sedan" >Check available models</button></p>
                        </form>
                        </div>
                      </div>
                    </div>
                  </div> 



                  <div class="row">
                    <div class="column">
                      <div class="card">
                        <img src="../img/categories/convertible.png"  style="width:200px; height:200px;">
                        <div class="container">
                          <h2>Convertible</h2>
                          <p>Gives you all the freedom you deserve.</p>
                          <form action="displaybycategory" method="POST">
                            <p><button class="button" type="submit" name="category" value="convertible" >Check available models</button></p>
                        </form>
                        </div>
                      </div>
                    </div>

                    <div class="column">
                      <div class="card">
                        <img src="../img/categories/coupe.png"  style="width:200px; height:200px;">
                        <div class="container">
                          <h2>Coupe</h2>
                          <p>Sporty looks, aggressive driving.</p>
                          <form action="displaybycategory" method="POST">
                            <p><button class="button" type="submit" name="category" value="coupe" >Check available models</button></p>
                        </form>
                        </div>
                      </div>
                    </div>

                    <div class="column">
                      <div class="card">
                        <img src="../img/categories/sports.png"  style="width:200px; height:200px;">
                        <div class="container">
                          <h2>Sports</h2>
                          <p>City conqueror, track monster.</p>
                          <form action="displaybycategory" method="POST">
                            <p><button class="button" type="submit" name="category" value="sports" >Check available models</button></p>
                        </form>
                        </div>
                      </div>
                    </div>
                  </div>



                  <h1>Show cars by Make</h1>


                  <form action="displaybymake" method="POST">

                  <table style="width:100%" id="carmakes">
                    <tr>
                      <td><p><button class="button" type="submit" name="make" value="Audi" >Audi</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Fiat" >Fiat</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Hyundai" >Hyundai</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Mazda" >Mazda</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Nissan" >Nissan</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Toyota" >Toyota</button></p></td>
                    </tr>
                    <tr>
                      <td><p><button class="button" type="submit" name="make" value="BMW" >BMW</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Ford" >Ford</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Kia" >Kia</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Mercedes-Benz" >Mercedes-Benz</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Porsche" >Porsche</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Volkswagen" >Volkswagen</button></p></td>
                    </tr>
                    <tr>
                      <td><p><button class="button" type="submit" name="make" value="Chevrolet" >Chevrolet</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Honda" >Honda</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Range Rover" >Range Rover</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Mitsubishi" >Mitsubishi</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Subaru" >Subaru</button></p></td>
                      <td><p><button class="button" type="submit" name="make" value="Volvo" >Volvo</button></p></td>
                    </tr>
                  </table>

                  </form>



          </div>





</div>

</body>
</html>

carcategory.html

    <!DOCTYPE html>

<html>

    <link href="../css/carcategory.css" rel="stylesheet">

    <div class="uppercontent">



        <a href="index" id="logolink">
            <img  src="../img/logo_transparent.png"  >
        </a>

        <h2>Current category: $categ</h2>
        <hr>

    </div>


        <table><tr>




        % for a in mydata:

            % if loop.index % 3 == 0:

                </tr><tr><td>

                    <div class="card" style="margin-left: 125px;">
                        <img src="../img/cars/1.jpg"  style="width:200px; height: 200px;">
                        <h1>$a[1]</h1>
                        <p>$a[2]</p>
                        <p class="price">EUR $a[4]</p>
                        <p><button>Check it out</button></p>
                    </div> 


                </td>


            % elif loop.index %3 != 0:


                <td>

                    <div class="card">
                        <img src="../img/cars/1.jpg"  style="width:200px; height: 200px;">
                        <h1>$a[1]</h1>
                        <p>$a[2]</p>
                        <p class="price">EUR $a[4]</p>
                        <p><button>Check it out</button></p>
                    </div> 


                </td>

        % endif       


        % endfor


</html>

start.py:

    import cherrypy
import mysql.connector
from mysql.connector import errorcode
import os
from mako.template import Template
from mako.lookup import TemplateLookup


path = os.path.abspath(os.path.dirname(__file__))

lookup = TemplateLookup(directories=[os.path.join(path, 'html')])


mydb = mysql.connector.connect(
  host="localhost",
  user="root",
  password="luk610",
  database="siteril"
)



class MainPage(object):

    @cherrypy.expose
    def index(self):
        template = lookup.get_template('index.html')
        return template.render()

    index.exposed = True

    @cherrypy.expose
    def displaybycategory(self, category):
        template = lookup.get_template('carcategory.html')

        mycursor = mydb.cursor()

        payload = 'SELECT * FROM cars WHERE category=' + '"' + category + '"'

        mycursor.execute(payload)

        result = mycursor.fetchall()

        return template.render(mydata=result, categ=category)

    displaybycategory.exposed = True

    @cherrypy.expose
    def displaybymake(self, make):
        template = lookup.get_template('carmake.html')

        mycursor = mydb.cursor()

        payload = 'SELECT * FROM cars WHERE make=' + '"' + make + '"'

        mycursor.execute(payload)

        result = mycursor.fetchall()

        return template.render(mydata=result)

    displaybycategory.exposed = True

    @cherrypy.expose
    def about(self):
        template = lookup.get_template('about.html')
        return template.render()

    about.exposed = True

    @cherrypy.expose
    def contact(self):
        template = lookup.get_template('contact.html')
        return template.render()

    contact.exposed = True

if __name__ == '__main__':

    conf_path_root = os.path.dirname(os.path.abspath(__file__))
    conf_path = os.path.join(conf_path_root, "config.conf")
    cherrypy.config.update(conf_path)

    cherrypy.tree.mount(MainPage(), '/', config=conf_path)
    cherrypy.engine.start()
    cherrypy.engine.block()

这应该是这样的:src="../img/cars/a[0].jpg",其中 a[0] 获取汽车 ID

如果我没有包含任何内容或没有澄清问题,我深表歉意。我是这个东西的完整初学者,任何帮助/建议将不胜感激。谢谢!

【问题讨论】:

【参考方案1】:

我发现的唯一临时解决方案是通过多个 if 语句对图片选择进行硬编码......(是的,我知道...... :D)就像这样:

                      % if a[0] == 1:
                        <img src="../img/cars/1.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 2:
                        <img src="../img/cars/2.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 3:
                        <img src="../img/cars/3.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 4:
                        <img src="../img/cars/4.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 5:
                        <img src="../img/cars/5.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 6:
                        <img src="../img/cars/6.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 7:
                        <img src="../img/cars/7.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 8:
                        <img src="../img/cars/8.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 9:
                        <img src="../img/cars/9.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 10:
                        <img src="../img/cars/10.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 11:
                        <img src="../img/cars/11.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 12:
                        <img src="../img/cars/12.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 13:
                        <img src="../img/cars/13.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 14:
                        <img src="../img/cars/14.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 15:
                        <img src="../img/cars/15.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 16:
                        <img src="../img/cars/16.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 17:
                        <img src="../img/cars/17.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 18:
                        <img src="../img/cars/18.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 19:
                        <img src="../img/cars/19.jpg"  style="width:200px; height: 200px;">
                      % elif a[0] == 20:
                        <img src="../img/cars/20.jpg"  style="width:200px; height: 200px;">
                        %endif

我知道这很糟糕,但我似乎仍然无法找到一种方法来利用这些变量来将它们用作 src 的属性。

【讨论】:

【参考方案2】:

我认为您应该尝试使用 javascript 来替代您的问题。

还强烈建议使用字符串连接运算符(+, +=) 而不是其他方法来执行此操作。

【讨论】:

【参考方案3】:

在 HTML 中使用变量的 mako 语法如下: &lt;img src=$filename /&gt;

从包含该模板的模板接收变量文件名并将文件名作为变量传递。或者在模板中动态设置,在模板中运行 python 代码使用这个: filename = "/var/www/myproject/path" + "resources"

【讨论】:

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