I use jquery for validation of controls:
function RegisterClient() {
var bookname = true; var edition = true; var author = true; var price = true; var imgType = true; var imgSize = true;
if (j('#txt_book_name').val() === null) { //1
j('#alertBookName').removeClass('hidden');
bookname = false;
}
if (j('#txt_edition').val() === null) { //2
j('#alertEditionbook').removeClass('hidden'); edition = false;
}
if (j('#txt_author').val() === null) { //3
j('#alertAuthor').removeClass('hidden'); author = false;
}
if (j('#txt_price').val() === null) { //4
j('#alertPrice').removeClass('hidden'); price = false;
}
var fileType = j("#ContentPlaceHolder1_FileUpload1").val().split('.').pop().toLowerCase();
if (j('#ContentPlaceHolder1_FileUpload1').val() != "" && j.inArray(fileType, ['gif', 'png', 'jpg']) == -1)
{ j('#alertImgType').removeClass('hidden'); imgType = false; }
if (j('#ContentPlaceHolder1_FileUpload1').val() != null) {
var sizeImg = j("#ContentPlaceHolder1_FileUpload1")[0].files[0].size/1024;
if (sizeImg > 25) { j('#alertImgSize').removeClass('hidden'); imgSize = false; }
}
if (bookname && edition && author && price && imgType && imgSize) __doPostBack('ctl00$ContentPlaceHolder1$Button1', '');
}
In sections 1,2,3,4, the (j('#txt_...').val() === null)
statement does not work correctly.
The (var sizeImg = j("#ContentPlaceHolder1_FileUpload1")[0].files[0].size/1024;)
statement has an error, shown when using firebug. I can show the value of j("#ContentPlaceHolder1_FileUpload1")[0].files[0].size
with Alert()
, but there is an error.
Regarding your first problem:
The only that this is possible is that if condition gets executed before the user inputs anything.
I have made a fiddle to explain it:
https://jsfiddle.net/tr91Lw7y/
Run this and you will see "johndoe" instantly.
But if you run this:
You will see blank anytime you do this.
There is one solution to your problem if you cannot adjust the flow:
$("#txt_book_name").keyup(function(){
if($(this).val() === null) {
// Conditions
}
});
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