问题描述
当哈希值'Season'具有值时,我想显示下面的html
部分。麻烦的是,即使Season没有值,我什至都没有向模板发送名为Season的变量,或者即使我将下面的行更改为<% IF XSeason.size %>
<% IF Season.size %> <!-- season data -------------------------------------->
<div class="container" style="margin-top:20px;">
<div class="row">
<h3 class="text-center"> This should only show up if Season hash has value</h3>
<div class="col-md-12">
<div class="col-md-10">
<div class="form-group">
<table style="width:100%; line-height:40px;"> <!-- Feats (so far) as a table // -->
<% FOREACH $name in Seasonkeys %>
<tr>
<form role="form" action="../alpview" method="POST">
<td width="5"><% Season$name.stat %></td>
<td width="5"><% Season$name.AVG %></td>
<input type="hidden" name="chlng_id" value="<% Season$ID.ID %>" />
</form>
</tr>
<% END %>
</table>
</div>
</div>
</div>
</div>
</div>
<% END %>
更新:这是一个简单的示例。
<h2>Lets start with an array reference<h2>
<h3>What about fruits array: </h3>
<% FOREACH fruit IN fruits %>
<% fruit %>
<% END %>
<p>array size: </p><% fruits.size %></p>
<p>array dumped: </p><% USE Dumper; Dumper.dump(fruits) %>
输出:
Lets start with an array reference
What about fruits array:
apple bananna orange
array size:
array dumped:
解决方法
您的主张很容易被驳回:
use 5.014;
use warnings;
use Template qw( );
my $template = '<% IF Season.size %>Test<% END %>';
my $tt = Template->new({
START_TAG => '<%',END_TAG => '%>',});
print "No var: ";
$tt->process(\$template,{ })
or warn($tt->error());
say "";
print "Empty hash: ";
$tt->process(\$template,{ Season => { } })
or warn($tt->error());
say "";
print "Not empty hash: ";
$tt->process(\$template,{ Season => { a => 4 } })
or warn($tt->error());
say "";
输出:
No var:
Empty hash:
Not empty hash: Test
您的哈希不能为空。
,尝试将其添加到<% IF ... %>
标签之后。
<% Season.size %>
<% USE Dumper; Dumper.dump(Season) %>
至少您会看到TT认为该变量是什么。