Struts2 评估属性是否存在或其长度
我有这个 JSP，我将属性中的一些值放入 JavaScript 数组...它看起来像这样：
<s:iterator value="parts" status="status">
parts[<s:property value="category.categoryId" />][<s:property value="piezaId" />] = ['<s:property value="descripcion" />', '<s:property value="disponible" />'];
</s:iterator>
但有时，当没有为该部分设置类别时，它看起来
parts[1][460] = ['Vidrio Delantero RH', '1'];
parts[1][463] = ['Vidrio trasero LH', '1'];
parts[1][465] = ['Vidrio Trasero principal', '1'];
parts[1][462] = ['Vidrio trasero RH', '1'];
parts[][512] = ['Volanta', '1'];
parts[10][599] = ['Z de guía', '1'];
parts[1][692] = ['Farol de bumper delantero LH', '1'];
会破坏 JavaScript，在该部分中看起来像 parts[][512]
在 Struts1 中，我有函数 logic:present，我正在寻找 struts2 中等效/相似的东西...尝试过 < ;s:if test="#category.categoryId.length() > 0"> 但它永远不会实现...
任何帮助将不胜感激...
I have this JSP where I'm putting some values from a property to an JavaScript array... it looks just like this:
<s:iterator value="parts" status="status">
parts[<s:property value="category.categoryId" />][<s:property value="piezaId" />] = ['<s:property value="descripcion" />', '<s:property value="disponible" />'];
</s:iterator>
But sometimes when no category is setted for that part it looks like
parts[1][460] = ['Vidrio Delantero RH', '1'];
parts[1][463] = ['Vidrio trasero LH', '1'];
parts[1][465] = ['Vidrio Trasero principal', '1'];
parts[1][462] = ['Vidrio trasero RH', '1'];
parts[][512] = ['Volanta', '1'];
parts[10][599] = ['Z de guía', '1'];
parts[1][692] = ['Farol de bumper delantero LH', '1'];
and that broke the JavaScript, in the part that looks like parts[][512]
In Struts1, I have the function logic:present, im looking for something equivalent/similar in struts2... Tried <s:if test="#category.categoryId.length() > 0"> but it never comes to true...
Any help will be appreciated...
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您的空值对应于一个空字符串的
category.categoryId？还是空值？如果是第一个，那么我会尝试category中添加布尔方法 类我宁愿尝试避免使用 struts 标签的复杂逻辑，并将其委托给操作。例如，我会考虑使用一个额外的方法（例如
partsWithId()替代getParts()) 来过滤掉类别 ID 为空的部分，然后调用Your empty value corresponds to a
category.categoryIdthat is a empty string ? Or a null value? If the first, then I'd try<s:if test="category.categoryId.length() != 0">or add a boolean method in yourcategoryclass<s:if test="category.categoryIdNonEmpty">.I rather try to avoid complex logic with struts tags, and delegate that to the action. For example, I'd consider an additional method (say,
partsWithId()alternative togetParts()) that filters out the parts with empty categoryId, and then call<s:iterator value="partsWithId">我对 struts2 不太了解，但经过简短的浏览后，我认为您可能需要做更多类似这样的事情：
您有类别 0 吗？如果没有，这里还有另一个选择...这绝对是一个 hack，但它应该可以防止 js 代码被破坏。未分类的内容最终将归入类别 0。
I don't know much about struts2 but after a brief look around I think you might need to do something more like this:
<s:if test="%{#category.categoryId.length() > 0}">Do you have a category 0? If not, here's another option... It's definitely a hack, but it should keep the js code from breaking. Uncategorized stuff will end up in category 0.