下拉菜单和单选按钮不粘

Question

我正在创建一个包含 php 的 html 表单，以便从最终用户那里获取信息。用户提交信息后，顶部会发布一条消息。如果用户在点击提交后没有在任何字段中输入值，则会在顶部显示一条错误消息，并且已经输入的值应该仍然存在于输入中。

我遇到的问题是勾选复选框。

我首先发布了我的 html：

<label><input type="checkbox" name="interests[]" id="rainGauge" value="Make a Rain Gauge" <?php if(in_array("rainGauge", $_POST['interests'])) echo 'checked'; ?>> Make a Rain Gauge </label>
            <br><label><input type="checkbox" name="interests[]" id="thermometer" value="Make a Thermometer"<?php if(in_array("thermometer", $_POST['interests'])) echo 'checked'; ?>> Make a Thermometer </label>
            <br><label><input type="checkbox" name="interests[]" id="windsock" value="Make a Windsock"<?php if(in_array("windsock", $_POST['interests'])) echo 'checked'; ?>> Make a Windsock</label>
            <br><label><input type="checkbox" name="interests[]" id="lightningMouth" value="Make Lightning In Your Mouth"<?php if(in_array("lightningMouth", $_POST['interests'])) echo 'checked'; ?>> Make Lightning In Your Mouth</label>
            <br><label><input type="checkbox" name="interests[]" id="hygrometer" value="Make a Hygrometer"<?php if(in_array("hygrometer", $_POST['interests'])) echo 'checked'; ?>> Make a Hygrometer </label><br>
            

这是我的 php

  
  //foreach loop to show selected Interests
if ((!empty($_POST["interests"])) && ($stopPost !="Y"))
{
  echo "You have chosen the following workshops:";
  foreach($_POST["interests"] as $checked => $interests)
  {
    echo "<p><em>" . $interests ."</em></p>";

  }
}

我不确定为什么我正在使用的东西不起作用。我在网上搜索了解决方案，这似乎对大多数人都有效，所以我不确定我做错了什么。

Answer 1

您选择的方法可能会变得笨拙 - 所有的内联条件和 echo 语句都使它很难遵循并且非常臃肿。您可以轻松地使用 PHP 动态生成内容 - 从静态声明的数组、数据库查找或从源文件读取。这样做的好处是，您只需更改源值即可非常快速地修改内容。

例如，使用静态声明的数组：

<?php
    /*
        Simple function that does the POST lookup and determines if the supplied value is equal to the POST value.
        If it is then the default checked/selected string will be returned.
    */
    function setstate( $name, $type, $value ){
        if( isset( $_POST[ $name ] ) ){
            switch( $type ){
                case 'checkbox':
                    if( is_array( $_POST[ $name ] ) && in_array( $value, $_POST[ $name ] ) ) return 'checked';
                    if( $_POST[ $name ]==$value )return ' checked';
                break;
                case 'radio': if( $_POST[ $name ]==$value )return ' checked';
                case 'select': if( $_POST[ $name ]==$value )return ' selected';
            }   
        }
        return '';
    }
    
    /* easily extensible arrays to govern displayed content */
    $centres=array(
        'charleston'    =>  'Charleston',
        'summerville'   =>  'Summerville',
        'mtPleasant'    =>  'Mt. Pleasant',
        'burton'        =>  'Burton',
        'orangeburg'    =>  'Orangeburg'
    );
    $membership=array(
        'Y'         =>  'Yes',
        'N'         =>  'No',
        'signUp'    =>  'Sign me up.',
        'nfi'       =>  'Do not remember'
    );
    $interests=array(
        'rainGauge'         =>  'Make a Rain Gauge',
        'thermometer'       =>  'Make a Thermometer',
        'windsock'          =>  'Make a Windsock',
        'lightningMouth'    =>  'Make Lightning In Your Mouth',
        'hygrometer'        =>  'Make a Hygrometer',
        'hydro'             =>  'Make a Hydroponoic grow system',
        'gokart'            =>  'Make a motorised Go-Kart'
    );
?>

然后是 HTML

<form method='post'>

    <section data-id='Centers'>
        <label>Your closest center:
            <select name='closestCenter'>
                <option selected hidden disabled>Please select Center
                <?php
                    foreach( $centres as $key => $centre ){
                        printf('<option value="%s"%s>%s', $key, setstate('closestCenter', 'select', $key ), $centre );
                    }
                ?>
            </select>
        </label>
    </section>
    
    <section data-id='Membership'>
        <label for="member">Are you a member?
            <?php
                foreach( $membership as $key => $value ){
                    printf('<input type="radio" name="member" value="%s" %s/> %s',$key, setstate('member', 'radio', $key ), $value );
                }
            ?>
        </label>
    </section>
    
    <section data-id='Workshops'>
        <?php
            foreach( $interests as $key => $interest ){
                printf('<label><input type="checkbox" name="interests[]" value="%s" %s/>%s</label>', $key, setstate('interests', 'checkbox', $key ), $interest );
            }
        ?>
    </section>
    
    <input type='submit' />
</form>

希望对你有帮助