JavaScript转义表单值 [英] JavaScript Escaping Form Values

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本文介绍了JavaScript转义表单值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我知道有很多JavaScript转义问题,但似乎没有什么可以满足我的需要。



我有一个textarea元素动态显示在一个JSP上。在无效表单提交的情况下,我需要使用用户输入的值重新填充这些字段。我这样做(注意:简化版本):

  var textareaBox = document.getElementById(myTextArea); 
if(textareaBox){
textareaBox.value ='$ {myForm.myValue}';
}

一切正常,直到用户在包含特殊字符的框中输入值。我已经尝试单独使用转义 unescape JavaScript函数,并结合无效。

$ b有人知道我能处理这些特殊字符值吗?请注意,我显然不希望文本中的转义文本,因为这对用户来说看起来不太好。

解决方案

使用 JSTL < c:out> 标签以转义它,并将其分配为文本区域的 innerHTML

  textareaBox.innerHTML ='< c:out value =$ {myForm.myValue}/>'; 

但是,为什么不直接在textarea的正文中显示它,而不需要JS? p>

 < textarea id =myTextArea>< c:out value =$ {myForm.myValue}/> < / textarea的> 

< c:out> 并且其EL函数对应 fn:escapeXml())转义XML特殊字符。



另请参见:




I know there are a lot of JavaScript escaping questions, but nothing seemed to fit my needs.

I have textarea elements being dynamically displayed on a JSP. In the case of invalid form submits, I need to repopulate these fields with the values the user entered. I am doing this like so (note: simplified version):

var textareaBox = document.getElementById("myTextArea");
if (textareaBox) {
    textareaBox.value = '${myForm.myValue}';
}

Everything works fine until the user enters a value in the box that contains special characters. I've tried using the escape and unescape JavaScript functions individually and combined to no avail.

Does anyone know how I can handle these special character values? Note that I obviously do not want the escaped text in the textarea as this would not look good to users.

解决方案

Use JSTL's <c:out> tag to escape it and assign it as innerHTML of the text area:

textareaBox.innerHTML = '<c:out value="${myForm.myValue}" />';

But why don't you just display it in textarea's body directly without the need for JS?

<textarea id="myTextArea"><c:out value="${myForm.myValue}" /></textarea>

The <c:out> (and its EL function counterpart fn:escapeXml()) escapes XML special characters.

See also:

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