排除在上传对话框一些文件扩展名

Question

我需要允许选择文件对话框接受除了一些特定类型的任何类型的文件，比如我需要做的对话框显示一切除了.exe文件，

Answer 1

我看到这个问题已经存在并且有很好的答案。请检查波纹管连接Validation of file extension before uploading file

var _validFileExtensions = [".jpg", ".jpeg", ".bmp", ".gif", ".png"];  
 
function Validate(oForm) { 
 
    var arrInputs = oForm.getElementsByTagName("input"); 
 
    for (var i = 0; i < arrInputs.length; i++) { 
 
     var oInput = arrInputs[i]; 
 
     if (oInput.type == "file") { 
 
      var sFileName = oInput.value; 
 
      if (sFileName.length > 0) { 
 
       var blnValid = false; 
 
       for (var j = 0; j < _validFileExtensions.length; j++) { 
 
        var sCurExtension = _validFileExtensions[j]; 
 
        if (sFileName.substr(sFileName.length - sCurExtension.length, sCurExtension.length).toLowerCase() == sCurExtension.toLowerCase()) { 
 
         blnValid = true; 
 
         break; 
 
        } 
 
       } 
 
       
 
       if (!blnValid) { 
 
        alert("Sorry, " + sFileName + " is invalid, allowed extensions are: " + _validFileExtensions.join(", ")); 
 
        return false; 
 
       } 
 
      } 
 
     } 
 
    } 
 
    
 
    return true; 
 
}

<form onsubmit="return Validate(this);"> 
 
    File: <input type="file" name="my file" /><br /> 
 
    <input type="submit" value="Submit" /> 
 
</form>