I have explained here about uploading a file from UI (File upload and sending data to backend using angular js) .We can restrict user to upload only a war or zip file by checking the extension of file. Let us check with an example
function validateFile(){
var fileName = 'sample.zip';
var ext = fileName.substring(fileName.lastIndexOf('.') + 1);
if(ext.toLowerCase() == 'war')
{
return true;
}
else
{
return false;
}
}
if(validateFile())
{
//upload
}
else
{
//show a message
}
Same code you can use for any extension .Let us check same code for image upload
function validateImage(){
var imageName = 'sampleImage.png';
var ext = imageName.substring(imageName.lastIndexOf('.') + 1);
if(ext.toLowerCase() == 'png')
{
return true;
}
else
{
return false;
}
}
if(validateImage())
{
//upload
}
else
{
//show a message
}
Using the above validator function you can easily find out the extension of any files or images
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