如何检查表单是否包含文件输入？冷聚变

Question

我在将文件上传到表单时遇到问题。基本上，我想检查会话是否包含先前在 form.cfm 中提交的文件。但是，遇到的问题：复杂的对象类型无法转换为简单的值。这些是我的代码：

form.cfm代码::

<cfif structKeyExists(form, "Submit")>

    <cfif isDefined("Form.filecontent") AND evaluate("Form.filecontent") NEQ "" > 

        <cffile action = "upload" 
            fileField = "file" 
            destination = "#GetTempDirectory()#"
            nameConflict = "overwrite">

            <cfset form.storage = cffile>

    <cfelse>

        <cfset form.storage = "">

    </cfif>

    <cfset session.checkout.input = {
        storage=form.storage
    }>

    <cflocation url="formcomplete.cfm" addToken="false">

</cfif>

<!DOCTYPE html>
<html>
<head>
    <title>Testing</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link rel="stylesheet" type="text/css" href="bootstrap/css/bootstrap.min.css" />
    <!-- Other Scripts or CSS... -->
</head>
<body>
    <form method="post" enctype="multipart/form-data">

        <cfoutput>
            <input id="filecontent" name="filecontent" class="input-file" type="file" accept="application/vnd.ms-excel">
        </cfoutput>

        <button value="Submit" type="submit" id="Submit" name="Submit" class="btn btn-default">Submit</button>
    </form>
</body>
</html>

代码显示了将文件上传到临时目录并将变量保存到会话中。如果为空，会话变量的 form.storage 将被保存为空字符串。

formcomplete.cfm代码::

<cfif not structKeyExists(session, "checkout")>
    <cflocation url="form.cfm" addToken="false">
</cfif>

<cfif evaluate("session.checkout.input.storage") NEQ "">     <!-- !PROBLEM HERE! -->
    <cfset strPath = session.checkout.input.storage />
</cfif>
...More Codes after these.

如果form.cfm包含文件，错误发生在formcomplete.cfm的第5行。如果 form.cfm 不包含该文件，则该过程将顺利进行。

错误异常::

Complex object types cannot be converted to simple values.

The expression has requested a variable or an intermediate expression result as a simple value. However, the result cannot be converted to a simple value. Simple values are strings, numbers, boolean values, and date/time values. Queries, arrays, and COM objects are examples of complex values. The most likely cause of the error is that you tried to use a complex value as a simple one. For example, you tried to use a query variable in a cfif tag.

如何改进当前代码并解决问题？ *更新：正确的 cfif 语句是什么？

Answer 1

几个问题 - 确保在您的 cffile 中您获得正确的 fileField 名称（fileContent 是您表单中的字段名称）。

其次，您收到的错误是因为您没有指定 cffile.serverDirectory。如果您在错误发生之前将会话转储到 formComplete.cfm 上，您将看到一个结构 - 这就是错误的原因。您需要更深入地了解该结构 - 特别是 serverDirectory。以下是更改...

<cffile action = "upload" 
        fileField = "filecontent" 
        destination = "#GetTempDirectory()#"
        nameConflict = "overwrite">

        <cfset form.storage = cffile.serverDirectory>

另外，没有必要使用求值函数。我会这样重写它：

<cfif isDefined("Form.filecontent") AND Form.filecontent IS NOT "" >

或

<cfif isDefined("Form.filecontent") AND len(Form.filecontent) >

如何检查表单是否包含文件输入？冷聚变

How to check whether form contains file input? ColdFusion

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session

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contain

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