Jsvalidations/image upload validation using js.html at main · yashmundada/Jsvalidations · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>image validation</h1>
    <form name="myform" onsubmit="return validation()">
        <label >Image upload</label>
        <input type="file" name="img_upload">
        <br><br>
        <input type="submit" value="submit">
    </form>
    <script>
var img=document.forms['myform']['img_upload'];
var validExt=["jpeg","png","jpg"];
function validation(){
    if (img.value!=='') {

        var imgExt=img.value.substring(img.value.lastIndexOf('.')+1);
        var result=validExt.includes(imgExt);
        if (result==false) {
            alert("selected files are not image");
            return false;

        }
        else{
            if(parseFloat(img.files[0].size/(1024*1024))>=1){
                alert("image size must be less than 3MB :  size is"+parseFloat(img.files[0].size/(1024*1024)));
                return false;
            }

        }

    }
    else{
        alert("no image is selected");
        return false;
    }
    return true;
}


    </script>
</body>
</html>