How to validate please enter first field on selection of next text box in bootstrap

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i am using master page with aspx page
and my design is in Bootstrap so can you please help me when i choose second field for fill data then it require please fill first field in

please help me

What I have tried:

i am using master page with aspx page
and my design is in Bootstrap so can you please help me when i choose second field for fill data then it require please fill first field in

please help me

Posted 7-Apr-17 19:05pm

Member 12183079

Updated 7-Apr-17 21:41pm

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Karthik_Mahalingam 8-Apr-17 1:13am

use onblur Event[^] event to achieve that.

Member 12183079 8-Apr-17 1:43am

sir i am fresher
and i want to give alert like if somebody select Second textbox then alter show please fill first textbox so kindly give me any url

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Karthik_Mahalingam · Accepted Answer · 2017-04-07T21:41:00

tr

<!DOCTYPE html>
<html>
<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
</head>
<body>


    <script>
      
        function funcheck(txt) { 
             
            var key = parseInt(txt.getAttribute('key'));            
            var txts = document.getElementsByClassName('txtclass');
            for (var i = 0; i < txts.length; i++) {
                var attr = txts[i].getAttribute('key');
                if (attr) {
                    if (attr == key) {
                        $('.temp' + i).remove();
                        if (txts[i].value == '')
                            $(txts[i]).after(''">mandatory field!!')

                    }
                }
            }
        }
        

    </script>

    <input key="1" class="txtclass" type="text" onblur="funcheck(this); return false;" id="txt1" /> <br />
    <input key="2" class="txtclass" type="text" onblur="funcheck(this); return false;" id="txt2" /><br />
    <input key="3" class="txtclass" type="text" onblur="funcheck(this); return false;" id="txt3" />

 

</body>
</html>

Demo:- JSFiddle[^]