dynamic javascript/php form with radios creating a second field

Question

dynamic javascript/php form with radios creating a second field

330 Views Asked by Hector James Haddow At 10 April 2025 at 17:16

I'm having a little 'teething' problem here is my code so far

<form name="job_app">
    Source?<br/>
        <input type="radio" name="source" value="GAZ" id="GAZ" /> Stonoway Gazette <br/>
        <input type="radio" name="source" value="JCP" id="JCP" /> Job Center <br/>
        <input type="radio" name="source" value="WOM" id="WOM" /> Word of Mouth <br/><br/>

    <script language="text/JavaScript">
        if (document.job_app.source.GAZ.checked){
            document.write='Issue <br/><input type="text" name="issue" /><br/><br/>';
        }
        else if (document.job_app.source.JCP.checked){
            document.write='Ref <br/><input type="text" name="ref" /><br/><br/>';
        }
        //word of mouth has no additional input so there is no if statement for it
    </script>
</form>

what i want this to do is create (or unhide) the issue or ref text box depending on which radio button is selected without creating multiple text boxes.

sorry for any inconvenience if this is a rookie mistake, i have never worked with java before nor a language like it.

This is the working code as of 07:15 26/05/2012 as thanks to Amy McCrobie. It has undergone some edits since Amy's version (see below) i have moved all scripts above the form to make adding the next few fields easier, added a statement for word of mouth, omitted <head> as that is part of index.php and meta.php while this is for form.php, added a spacer and made the function name more specific.

index.php

<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML 1.1//EN"
    "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
    <head>
        <?php
            include './meta.php';
        ?>
    </head>
    <?php
        /*if(isset($_POST['submit'])){
            include './submit.php';
        }
        else{*/
            include './form.php';
        //}
    ?>
</html>

meta.php

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
<meta http-Equiv="Cache-Control" Content="no-cache" />
<meta http-Equiv="Pragma" Content="no-cache" />
<meta http-Equiv="Expires" Content="0" />
<title>job_app</title>
<link rel="StyleSheet" type="text/css" href="./style.css"/>

form.php

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
    $("#issueEl").hide();
    $("#refEl").hide();
});
    function showHide_source(){
        if (document.getElementById('GAZ').checked)
        {
            document.getElementById('issueEl').style.display = 'block';
            document.getElementById('refEl').style.display = 'none';
            document.getElementById('src_spEl').style.display = 'none';
        } 
        if (document.getElementById('JCP').checked)
        {
            document.getElementById('issueEl').style.display = 'none';
            document.getElementById('refEl').style.display = 'block';
            document.getElementById('src_spEl').style.display = 'none';
        }
    if (document.getElementById('WOM').checked)
        {
            document.getElementById('issueEl').style.display = 'none';
            document.getElementById('refEl').style.display = 'none';
            document.getElementById('src_spEl').style.display = 'block';
        }
    }
</script>
<form name="job_app" action="" method="post"> 
    Source?<br/> 
        <input type="radio" name="source" value="GAZ" id="GAZ" onChange="showHide_source()" /> Stonoway Gazette <br/> 
        <input type="radio" name="source" value="JCP" id="JCP" onChange="showHide_source()" /> Job Center <br/> 
        <input type="radio" name="source" value="WOM" id="WOM" onChange="showHide_source()" /> Word of Mouth <br/><br/> 
    <div class="hideable" id="issueEl">Issue <br/><input type="text" name="issue" /><br/><br/></div>
    <div class="hideable" id="refEl">Ref <br/><input type="text" name="ref" /><br/><br/></div>
    <div class="hideable" id="src_spEl"></div>
    rest of form        
    <input...
     .../>
</form>

style.css

div.hideable{
    height: 62px;
}

Original Q&A

There are 2 best solutions below

ScottC On 25 May 2012 at 20:35

I would suggest jQuery, it's not hard to learn, in fact I find it much easier than basic javascript also I would go the route of two textboxes that are hidden, and then showing them via jQuery

as it stands now I think if the user checks one radio button and then the other two text boxes will appear

and with jQuery added (which is as easy as including the sript at the top of your page your code would be more like this...

<form name="job_app"> 
    Source?<br/> 
        <input id="GAZ" type="radio" name="source" value="GAZ" id="GAZ" /> Stonoway Gazette <br/> 
        <input id="JCP" type="radio" name="source" value="JCP" id="JCP" /> Job Center <br/> 
        <input id="WOM" type="radio" name="source" value="WOM" id="WOM" /> Word of Mouth <br/><br/> 
        Issue <br/><input id="issue" type="text" name="issue" /><br/><br/>
        Issue <br/><input id="ref" type="text" name="ref" /><br/><br/>

    <script language="text/JavaScript">

        $("#issue").css("display","none"); 
        $("#ref").css("display","none"); 

        if ($("#GAZ").checked){ 
            $("#issue").css("display","inline"); 
            $("#ref").css("display","none"); 

        } 
         if ($("#JCP").checked){ 
            $("#issue").css("display","none"); 
            $("#ref").css("display","inline"); 

        } 
        //word of mouth has no additional input so there is no if statement for it 
    </script> 
</form>

**Amy McCrobie** · Accepted Answer

Try this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
    <meta http-Equiv="Cache-Control" Content="no-cache">
    <meta http-Equiv="Pragma" Content="no-cache">
    <meta http-Equiv="Expires" Content="0">
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
            $("#issueEl").hide();
            $("#refEl").hide();
        });
    </script>
    <title>Test</title>
</head>
<body>
<form name="job_app" action="" method="post"> 
    Source?<br/> 
        <input type="radio" name="source" value="GAZ" id="GAZ" onChange="showHide()" /> Stonoway Gazette <br/> 
        <input type="radio" name="source" value="JCP" id="JCP" onChange="showHide()" /> Job Center <br/> 
        <input type="radio" name="source" value="WOM" id="WOM" onChange="showHide()" /> Word of Mouth <br/><br/> 
        <div id="issueEl">Issue <br/><input type="text" name="issue" /><br/><br/></div>
        <div id="refEl">Issue <br/><input type="text" name="ref" /><br/><br/></div>
</form>
<script type="text/javascript">
function showHide(){
    if (document.getElementById('GAZ').checked)
    {
        document.getElementById('issueEl').style.display = 'block';
        document.getElementById('refEl').style.display = 'none';
    } 
    if (document.getElementById('JCP').checked)
    {
        document.getElementById('issueEl').style.display = 'none';
        document.getElementById('refEl').style.display = 'block';
    }
}
</script>
</body>
</html>

dynamic javascript/php form with radios creating a second field

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