设置输入值以获取变量

如何解决设置输入值以获取变量

我有两个网页。

index.php

其中包含一个表格

<form id="searchForm" class="" action="search.php" method="get" style="position:absolute; top:150pt; left:10pt; font-size:17pt;">
  <label for="">Postcode</label>
  <input type="text" id="postcode" name="postcode" value="" placeholder="AB12 3CD" oninput="checkPostcode()">
  <!-- function isValidPostcode(p) {
        var postcodeRegEx = /[A-Z]{1,2}[0-9]{1,2} ?[0-9][A-Z]{2}/i;
        return postcodeRegEx.test(p);
    } -->
  <br>
  <label for="">Type of Course</label>
  <select class="" name="coursetype">
    <option value="" disabled selected></option>
    <option value="online">Online</option>
    <option value="">In Person</option>
  </select>
  <br>

  <input type="submit" value="Search">
</form>

表单在search.php中提交了操作

search.php

这与上一页中输入的数据显示相同的形式

<?PHP $postcode = $_GET['postcode'];?>
    <form class="" action="search.php" method="get">
    Postcode <input type="text" name="postcode" value="
    <?php
    $postcode = str_replace('%20',' ',$postcode);
    $postcode = str_replace('-',$postcode);
    $postcode = str_replace('%09','',$postcode); // This line was added to try to remove 
    the tabs
    echo $postcode;
    ?>
    ">

    Tags


    <select id="tagsInput" class="js-example-basic-hide-search-multi" name="specialities[]" 
    multiple="multiple" onkeyup="filterTags()">
        <option value="AL">Lorem</option>
        <option value="WY">ipsum</option>
    </select>

    <script>
    $(document).ready(function() {
        $('.js-example-basic-hide-search-multi').select2({language: "en"});
    })
    </script>
    <script>
    function filterTags() {
        var input,filter,table,tr,td,i,txtValue;
        input = document.getElementById("tagsInput");
        filter = input.value.toUpperCase();
        table = document.getElementById("searchTable");
        tr = table.getElementsByTagName("tr");
        for (i = 0; i < tr.length; i++) {
            td = tr[i].getElementsByTagName("td")[2];
            if (td) {
                txtValue = td.textContent || td.innerText;
                if (txtValue.toUpperCase().indexOf(filter) > -1) {
                    tr[i].style.display = "";
                } else {
                    tr[i].style.display = "none";
                }
            }
        }
    }
    </script>
    <input type="submit" value="Submit">
</form>

但是，当输入显示在search.php中时，输入的两侧都有两个选项卡。

我该如何摆脱呢？

解决方法

很有趣，因为使用PHP，您会收到该错误。

Postcode <input type="text" name="postcode" value="
<?php
$postcode = str_replace('%20',' ',$postcode);
$postcode = str_replace('-',$postcode);
$postcode = str_replace('%09','',$postcode); // This line was added to try to remove 
the tabs
echo $postcode;
?>
">

请注意您的value="，然后在下一行开始<?php。两者之间的空白是造成您空白的原因。只需将这两个粉碎在一起，它就会消失：

Postcode <input type="text" name="postcode" value="<?php
$postcode = str_replace('%20',$postcode); // This line was added to try to remove 
the tabs
echo $postcode;
?>">

呈现页面时，HTML会自动将多个空格折叠成一个空格，但会保留一个空格，这就是您所看到的。

我看不到一个以多余的空格结尾的地方，但是扔在trim()上不会感到受伤：

Postcode <input type="text" name="postcode" value="
<?php
$postcode = str_replace('%20',$postcode);
$postcode = trim($postcode);
echo $postcode;
?>
">

trim()将修剪字符串开头和结尾的所有空格（以防用户意外添加了一些内容）。

,

这将在两侧插入\ n

Postcode <input type="text" name="postcode" value="
    <?php ...?>
    ">

这不会：

Postcode <input type="text" name="postcode" value="<?php 
...
?>">

为了确保您可以执行此操作

Postcode <input type="text" name="postcode" 
value="<?=trim(str_replace('-',$postcode))?>">

,

问题是代码的这一部分中的换行符。

Postcode <input type="text" name="postcode" value="
    <?php
    $postcode = str_replace('%20',$postcode);
    $postcode = str_replace('-',$postcode);
    $postcode = str_replace('%09',$postcode);
    echo $postcode;
    ?>
">

要解决此问题，请在str_replace之前放置HTML行，以删除所有换行符

$postcode = str_replace('%20',$postcode);

Postcode <input type="text" name="postcode" value="<?php echo $postcode ?>">

我还建议您将所有POST数据验证放在HTML之前，这样做可以使您的代码看起来更加整洁。