[英]Freemarker template to check the constant value
Here is my piece of code 这是我的代码
<#if (miscValue_index > 0)><#break></#if>
<td valign=""top"">${miscValue.propertyName!}</td>
<td width=""10px""> </td>
<td valign=""top"">${miscValue.propertyValue!}</td>
<td width=""10px""> </td>
<td valign=""top"">${miscValue.newPropertyValue!}</td>
<td width=""10px""> </td>
i want to check if " miscValue.propertyValue " value is UNDEFINED or valid string 我想检查“ miscValue.propertyValue ”值是否未定义或有效字符串
miscValue.propertyValue will return a valid string or UNDEFINED. miscValue.propertyValue将返回有效字符串或UNDEFINED。 If the value returned is "UNDEFINED",i need to update "empty string" else the "orginal value" using freemarker language.Could anyone please help on this.
如果返回的值是“未定义”,我需要使用freemarker语言更新“空字符串”,否则需要更新“原始值”。任何人都可以提供帮助。 Thanks in advance
提前致谢
I think you are looking for something as below, 我认为您正在寻找以下内容,
<#if value?? >
$value
<#if/>
<#if value?? >
$value
<#else>
<#if/>
Here value can be a token that you want to verify. 此处的值可以是您要验证的令牌。 You can add <#else> tag if you want to print something else like blank space in case value is not valid as mentioned in second example.
如果要打印第二个示例中提到的值无效的空白,则可以添加<#else>标记。
您可以这样使用:
<#if variable_to_test??>not null!<#else>null!</#if>
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