使用javascript来分配一个php变量 [英] Using javascript to assign a php variable
问题描述
我从envato市场购买modalbox插件在javascript我想使用它来实现我的类别>子类别>项目。无论如何我知道JavaScript变量可以分配一个值使用PHP，但我需要相反。
I purchased modalbox plugin from envato market place made in javascript i want to use it to implement my categories> subcategories> items. Anyhow i know JavaScript variable can be assigned a value using php however i need the opposite.
在我的第一步，我让用户选择一个类别使用基本链接，然后onclick甚至
On my first step i let the user pick a category using basic links then onclick even takes them to second slide where i want to display the subcategories and items related to this category that was selected.
我尝试了两件事：
1) setting onClick = "step2();<?php $chosen_cat = ' . $this->db->escape(trim($category)) . '?>"
希望我可以简单地将所选类别的名称赋值为一个值，然后使用$ chosen_cat step2（）javascript方法显示产品，但是这打破了javascript，因为在输出中有冲突;
Hoping i can simply assign the name of the selected category to a value and then just use $chosen_cat in step2() javascript method to display products however this breaks the javascript as there is a conflict in output;
到步骤2（类别）然后使用，
onclick =step2（db-> escape（$ category）;）;这传递
值到step2（）方法，但是现在我需要调用< - 我需要打印输出
字符串到php，但我不知道如何解决这个
考虑PHP - > JS是可行的作为其服务器到客户端关系，但
回来..
2) I changed step2() to step2(category) and then used, onclick="step2(db->escape($category););" this passes the value to the step2() method however now i would need to call <-- I would need to print out that string to php however i have no idea how to solve this considering PHP -> JS is viable as its server to client relation but back..
$ this- > db-> escape（）是一个 http://codeigniter.com/user_guide/database/queries。 html codeigniter方法。
The $this->db->escape() is a http://codeigniter.com/user_guide/database/queries.html codeigniter method.
我的代码：
<script type="text/javascript">
function step1() {
modalbox.show(new Element("div").insert(
new Element("p", { "align": "justify" }).insert(
<?php
$categories = $items;
$chosen_cat = '';
?>
<?php
$i = 0;
foreach($categories as $category => $itemarray) {
$i++;
if($i==27){
echo $this->db->escape('<a class="category" onclick="step2();<?php $chosen_cat = ' . $this->db->escape(trim($category)) . '?>" href="#">'. trim($category) . '</a>');
}
else {
echo $this->db->escape('<a class="category" onclick="step2();" href="#">' . trim($category) . '</a>') . '+';
}
}
?>
)
), {
"title" : "Step 1/3",
"width" : 800,
"options" : [{
"label" : "Next »",
"onClick" : step2
}]
});
};
function step2() {
alert(<?php $this->db->escape($chosen_cat); ?>);
modalbox.show([ new Element("div").insert(
new Element("p", { "align": "justify" }).insert(
"If you open a modalbox when another one is opened, it will stretch to the new " +
"modalbox width and height and overwrite the content.<br /\><br /\>" +
"You can use HTML or Prototype Elements like a DIV or a TABLE."
)
),
new Element("p", { "align": "justify" }).insert(
"You can have multiple contents on a single modalbox by using an array like this:<br /\><br /\>" +
"<pre>modalbox.show([ content1, content2, ... ], options);</pre>"
)
], {
"title" : "Step 2/3",
"width" : 800,
"options" : [{
"label" : "« Previous",
"onClick" : step1
}, {
"label" : "Next »",
"onClick" : step3
}]
});
};
function step3() {
modalbox.show([ new Element("div").insert(
new Element("p", { "align": "justify" }).insert(
"If you open a modalbox when another one is opened, it will stretch to the new " +
"modalbox width and height and overwrite the content.<br /\><br /\>" +
"You can use HTML or Prototype Elements like a DIV or a TABLE."
)
),
new Element("p", { "align": "justify" }).insert(
"You can have multiple contents on a single modalbox by using an array like this:<br /\><br /\>" +
"<pre>modalbox.show([ content1, content2, ... ], options);</pre>"
)
], {
"title" : "Step 3/3",
"width" : 800,
"hideOnPageClick": false,
"options" : [{
"label" : "« Previous",
"onClick" : step2
}, {
"label" : "Finish",
"isDefault" : true,
"onClick" : modalbox.hide
}]
});
};
</script>
可以在onclick事件中使用JavaScript设置会话变量，例如$ _SESSION ['category '] ='category'在js风格，然后读取该会话与PHP和取消设置它我不认为这将创建很多安全问题，因为会话存在不足一秒。
Would it be possible to set a session variable with JavaScript in the onclick event say $_SESSION['category'] = 'category' in js style and then read that session with php and unset it i dont think this would create much of a security problem as session would exist for prolly less than a second.
推荐答案
JavaScript永远不会设置PHP变量。 JavaScript在客户端上运行，PHP在服务器上运行。如果您需要在JS上更改服务器上的某些内容，您必须使用AJAX或发送常规的HTTP请求。
JavaScript is never going to set a PHP variable. JavaScript runs on the client and PHP on the server. If you need to change something on the server from JS, you have to use AJAX, or send a regular HTTP request.
或者，您可以让PHP生成数据是在客户端运行时需要的，通常通过打印一些JSON来成为一个JS变量。
Alternatively, you can have PHP generate the data that is needed at runtime on the client, usually by printing some JSON to become a JS variable
在你的例子中，你需要类似下面的东西为了简单起见）
In your example, you would need something like the following (I'll use jQuery for simplicity)
... onclick="$.ajax('/category.php').done(function(data) {step2(data.category);})"
HTML中的JS
$('#my-button').click(function(){
$.ajax('/category.php').done(function(data) {
step2(data.category);
});
});
我不能给你一个AJAX教程，但主要的是， AJAX请求，当您需要来自服务器的数据。
I can't give you an AJAX tutorial, but the main thing is that you'll make an AJAX request when you need data from the server.
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