jquery validation plugin - file upload

问题

I am using jquery validation plugin for validating my form. I have one file field in form for uploading documents.

<input type="file" name="policyBriefFiles" id="policyBriefFiles" multiple="multiple">

Here is my validation code for this field.

policyBriefFiles: {
         extension:'xlsx,pdf',
         filesize: 2097152,  
     },

Now I want users to select maximum two files, but with multiple attribute specified with file user can select any number of files.

How do I restrict users to select maximum two files and no more? Is there any rule available in jquery validation plugin for this? (like maxFile: 2)

I don't mind any other workaround also.

回答1:

I made custom validation method for this. Here it is

$.validator.addMethod("maxFilesToSelect", function(value, element, params) {
    var fileCount = element.files.length;
    if(fileCount > params){
        return false;
    }
    else{
        return true;
    }
},  'Select no more than 2 files');

And specify rule as

policyBriefFiles: {
         extension:'xlsx,pdf',
         filesize: 2097152,  
         maxFilesToSelect : 2,
     },

Working as charm :-)

来源：https://stackoverflow.com/questions/36147958/jquery-validation-plugin-file-upload