Using Javascript to hide textfields

Question

If a user selects a certain option value in one select field, how do you then make a text field hidden, s it will not be needed. This must be done before the form is submitted?

For example in the following select field, a user select chooses value='a' then how would this text field become hidden:

     <select name="form" id="aForm">
        <option value="a">choice1</option>
        <option value="b">choice2</option>
        <option value="c">choice3</option>
     </select>

     <input type="text" style="width:285px" name="textField" id="textField"/>

Adrian Ber · Accepted Answer · 2012-12-22 22:34:58Z

4

$("#aForm").on("change", function() { 
    if ($(this).val() == "a") 
        $("#textField").hide();
    else 
        $("#textField").show(); 
});

Here is also a jsfiddle

I assumed that you will show the textfield for any other value than a.

If you're using plain JavaScript and not jQuery

function hideTF() {
    var s = document.getElementById("aForm");
    document.getElementById("textField").style.display 
         = (s.selectedIndex > 0  && s.options[s.selectedIndex] == 'a'
         ? "none" : "block");
}
var s = document.getElementById("aForm");
if (s.attachEvent)
    s.attachEvent("onchange", hideTF);
else
    s.addEventListener("change", hideTF, false);

edited Dec 22, 2012 at 22:34

answered Dec 22, 2012 at 22:00

Adrian Ber

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11 Comments

Felipe Oriani Over a year ago

Nice solution Adrian, but he is not using jQuery.

Adrian Ber Over a year ago

I modified my solution for plain JavaScript too.

The Alpha Over a year ago

if(this.val()) should be if($(this).val()) or if(this.value).

The Alpha Over a year ago

Did you put it inside $(document).ready(function(){ // code goes here });

user1869421 Over a year ago

@SheikhHeera: Thanks that was the problem. Works perfectly now. Thanks for both of yours help.

|

David G · Accepted Answer · 2012-12-22 21:58:11Z

2

You can use a variation of this:

var selection = aForm.selectedIndex,
    field = document.getElementById('textField');

if ( selection === x ) {

    field.style.display = "block"; // or visibility = "hidden"

}

This should be enclosed in an .onchange event. aForm.selectedIndex is the index of the corresponding <option> element that is selected.

answered Dec 22, 2012 at 21:58

David G

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