如何通过 AJAX 发送“ &”(& 符号)字符？

我想用 JavaScript 中的 POST方法发送一些变量和一个字符串。

我从数据库中获取字符串，然后将其发送到 PHP 页面。我使用的是 XMLHttpRequest对象。

问题是字符串包含字符 &几次，而且在 PHP 中 $_POST数组看起来像多个键。

我尝试用 replace()函数替换 &和 \&，但它似乎没有任何作用。

有人能帮忙吗？

Javascript 代码和字符串如下所示:

var wysiwyg = dijit.byId("wysiwyg").get("value");
var wysiwyg_clean = wysiwyg.replace('&','\&');


var poststr = "act=save";


poststr+="&titlu="+frm.value.titlu;
poststr+="&sectiune="+frm.value.sectiune;
poststr+="&wysiwyg="+wysiwyg_clean;
poststr+="&id_text="+frm.value.id_text;


xmlhttp.open("POST","lista_ajax.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send(poststr);

字符串是:

 <span class="style2">&quot;Busola&quot;</span>
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You might want to use encodeURIComponent().

encodeURIComponent("&quot;Busola&quot;"); // => %26quot%3BBusola%26quot%3B
小开

You need to url-escape the ampersand. Use:

var wysiwyg_clean = wysiwyg.replace('&', '%26');

As Wolfram points out, this is nicely handled (along with all the other special characters) by encodeURIComponent.

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最佳答案

You can use encodeURIComponent().

It will escape all the characters that cannot occur verbatim in URLs:

var wysiwyg_clean = encodeURIComponent(wysiwyg);

In this example, the ampersand character & will be replaced by the escape sequence %26, which is valid in URLs.

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You could encode your string using Base64 encoding on the JavaScript side and then decoding it on the server side with PHP (?).

JavaScript (Docu)

var wysiwyg_clean = window.btoa( wysiwyg );

PHP (Docu): 

var wysiwyg = base64_decode( $_POST['wysiwyg'] );
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Ramil Amr's answer works only for the & character. If you have some other special characters, you should use PHP's htmlspecialchars() and JS's encodeURIComponent().

You can write:

var wysiwyg_clean = encodeURIComponent(wysiwyg);

And on the server side:

htmlspecialchars($_POST['wysiwyg']);

This will make sure that AJAX will pass the data as expected, and that PHP (in case your'e insreting the data to a database) will make sure the data works as expected.

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The preferred way is to use a JavaScript library such as jQuery and set your data option as an object, then let jQuery do the encoding, like this:

$.ajax({
type: "POST",
url: "/link.json",
data: { value: poststr },
error: function(){ alert('some error occured'); }
});

If you can't use jQuery (which is pretty much the standard these days), use encodeURIComponent.

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encodeURIComponent(Your text here);

This will truncate special characters.

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You can pass your arguments using this encodeURIComponent function so you don't have to worry about passing any special characters.

data: "param1=getAccNos&param2="+encodeURIComponent('Dolce & Gabbana')

OR

var someValue = 'Dolce & Gabbana';
data: "param1=getAccNos&param2="+encodeURIComponent(someValue)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent


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