CODEWITHSUNDEEP
javascriptjqueryvalidationinput
Stephen Hammett
Stephen Hammett

Reputation: 117

How to validate a form's input value

I am trying to validate a form's input value after clicking a button using jQuery and javascript.

Right now, if I put in a value for the input and click submit the input field and button just disappears. Any idea what I have wrong here?

The HTML file...

<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <link/>
        <script type='text/javascript' src='script.js'></script>
    </head>
    <body>
            <form>
                <input type="text" id='input_1'>
                <input type="submit" value="Send" id="send">
            </form>   
    </body>
</html>

The script file...

$(document).ready(function() {
    $('.send').click(function() {
        validateInput(document.getElementById('#input_1'));
        function validateInput(inputValue){
             if (inputValue === 3) {
             alert("Element cannot be equal to 3");
             }
        }
    });
});

Upvotes: 0

Views: 169

Answers (3)

Stephen Hammett
Stephen Hammett

Reputation: 117

Thank you all for your responses. Unfortunately, I wasn't able to get it to work using your recommendations. I decided to use jQuery to get the element and appended a message to a div instead of using alert. This was a different approach but ended up working.

HTML...

<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <link/>
        <script type="text/javascript" src="script.js"></script>
    </head>
    <body>
            <form>
                <input type="text" name="input"/>

            </form>
            <button id="send">Send</button>
            <div class="error">
            </div>
    </body>
</html>

SCRIPT...

$(document).ready(function() {
    $('#send').click(function(){ 
    var toValidate = $('input[name=input]').val();
    if (toValidate == 3) {
    jQuery('.message').html('');
        $('.error').append('<div class="message">' + toValidate + " is    invalid" + '</div>');
    }
    else {
        jQuery('.message').html('');
        $('.error').append('<div class="message">' + toValidate + " is valid" + '</div>');
         }

    });
});

Upvotes: 0

웃웃웃웃웃
웃웃웃웃웃

Reputation: 11984

$(document).ready(function() {
    $('#send').live('click',function() { //Because send is the id of your button
        if(validateInput(document.getElementById('#input_1'))){
            alert("Element cannot be equal to 3");
            return false;
         }
         else{
             //Do something else
         }
        function validateInput(inputValue){
             if (inputValue == 3) {
             return false;//Will prevent further actions
             }
        }
    });
});

Upvotes: 1

Richard Tonata
Richard Tonata

Reputation: 363

  1. this $('.send').click(function() { should be $("#send").click(function() {. Notice the Hash symbol and not the dot (.), dot is used if the selector is a class whereas the # is used if the selector is an ID.

2.You should move the validation function outside the $(document).ready(function().. Hope that helps

Upvotes: 0

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