在PHP中添加margin-left脚本
[英]Add margin-left, script inside php
问题描述
The problem is. 
问题是。 I want to inset margin-left: 20%; 我要插入左边距：20％； to maincontent, when the user is logged in. 当用户登录时显示为maincontent。
No i dont have a problem with syntax, i can get it done in js, but im told to use php. 不，我在语法上没有问题，我可以在js中完成，但是我被告知要使用php。 So i also added a class in css and to my body. 因此，我还在CSS和我的身体中添加了一个类。
<?php
if ($_SESSION['username']){
include("/view/leftmenu.php");
}
?>
How do i activate css in php? 如何在php中激活CSS？
3 个解决方案
解决方案1
4 2013-11-07 22:10:35
As revealed by the syntax highlighting, you're trying to put a single quote inside a single-quoted string. 正如语法高亮显示的那样，您试图将单引号放在单引号字符串中。
Your options are: 您的选择是：
- Escape the single quotes with
\\'.用\\'转义单引号。 - Use double quotes instead. 请改用双引号。
- Use
?> ... <?phpinstead ofecho.使用?> ... <?php而不是echo。 - Don't do this with JavaScript at all! 根本不用JavaScript做到这一点！ You control the server side; 您控制服务器端； why not just add a class to the body like
logged-in, and have a CSS rule likebody.logged-in #maincontent { margin-left: 20%; }为什么不只是像logged-in一样向主体添加一个类，并像body.logged-in #maincontent { margin-left: 20%; }这样拥有CSS规则body.logged-in #maincontent { margin-left: 20%; }body.logged-in #maincontent { margin-left: 20%; }?body.logged-in #maincontent { margin-left: 20%; }？
(For what it's worth your JavaScript is invalid too; you need to quote the 20% . Percentages aren't legal JS.) （对于您的JavaScript而言，这也是无效的；您需要引用20% 。百分比不是合法的JS。）
解决方案2
1 2013-11-07 22:09:31
Put your JavaScript in double quotes, with single quotes inside. 将JavaScript放在双引号中，并在其中加上单引号。 You may want to run your include first as well. 您可能还想先运行您的include 。 include does not need () . include不需要() 。 Your code could look more like: 您的代码可能更像：
<?php
session_start(); // has to be run before any headers are sent
if(isset($_SESSION['username'])){
include '/view/leftmenu.php';
echo "<script type='text/javascript'>$('#maincontent').css('margin-left', '20%');</script>";
}
?>
The better solution however would look more like: 但是，更好的解决方案更像是：
<?php
session_start(); $marginLeft = '0'; // $marginLeft should be your default
if(isset($_SESSION['username'])){
$marginLeft = '20%';
include '/view/leftmenu.php';
}
echo "<!DOCTYPE html><html><head><style type='text/css'>".
"#maincontent{margin-left:$marginLeft;}</style></head><body>".
"<div id='maincontent'>content</div></body></html>";
?>
A better approach yet, would look like: 更好的方法如下：
<?php
session_start(); $className = 'withoutMargin'; // $marginLeft should be your default
if(isset($_SESSION['username'])){
$className = 'withMargin';
include '/view/leftmenu.php';
}
?>
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.withoutMargin{
margin-left:0;
}
.withMargin{
margin-left:20%;
}
</style>
</head>
<body>
<?php echo " <div class='$className'>"; ?>
<!-- your content here -->
</div>
</body>
</html>
Note: Your code above does not have to look exactly like this. 注意：上面的代码不必看起来完全像这样。 This just illustrates concept. 这仅说明了概念。 You would have more code testing for submit to be set and so forth. 您将进行更多的代码测试以设置提交等等。 Also, with the second example, which I recommend, I would use external CSS, so it is cached by the user's Browser. 另外，在第二个示例中，我建议使用外部CSS，因此它由用户的浏览器缓存。
解决方案3
0 2013-11-07 22:08:55
20% needs to be in quotes: 20％需要用引号引起来：
$('#maincontent').css('margin-left', '20%');
This also applies to px, em, pt, and any other form of CSS unit of measurement. 这也适用于px，em，pt和任何其他形式的CSS度量单位。
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