MFB MFB - 16 days ago 8
HTML Question

"Invalid form control" only in Google Chrome

The code below works well in Safari but in Chrome and Firefox the form will not submit. Chrome console logs the error

An invalid form control with name='' is not focusable
. Any ideas?

Note that whilst the controls below do not have names, they should have names at the time of submission, populated by the Javascript below. The form DOES work in Safari.

<form method="POST" action="/add/bundle">
<p>
<input type="text" name="singular" placeholder="Singular Name" required>
<input type="text" name="plural" placeholder="Plural Name" required>
</p>
<h4>Asset Fields</h4>
<div class="template-view" id="template_row" style="display:none">
<input type="text" data-keyname="name" placeholder="Field Name" required>
<input type="text" data-keyname="hint" placeholder="Hint">
<select data-keyname="fieldtype" required>
<option value="">Field Type...</option>
<option value="Email">Email</option>
<option value="Password">Password</option>
<option value="Text">Text</option>
</select>
<input type="checkbox" data-keyname="required" value="true"> Required
<input type="checkbox" data-keyname="search" value="true"> Searchable
<input type="checkbox" data-keyname="readonly" value="true"> ReadOnly
<input type="checkbox" data-keyname="autocomplete" value="true"> AutoComplete
<input type="radio" data-keyname="label" value="label" name="label"> Label
<input type="radio" data-keyname="unique" value="unique" name="unique"> Unique
<button class="add" type="button">+</button>
<button class="remove" type="button">-</button>
</div>

<div id="target_list"></div>
<p><input type="submit" name="form.submitted" value="Submit" autofocus></p>
</form>

<script>
function addDiv()
{
var pCount = $('.template-view', '#target_list').length;
var pClone = $('#template_row').clone();
$('select, input, textarea', pClone).each(function(idx, el){
$el = $(this);
if ((el).type == 'radio'){
$el.attr('value', pCount + '_' + $el.data('keyname'));
}
else {
$el.attr('name', pCount + '_' + $el.data('keyname'));
};
});
$('#target_list').append(pClone);
pClone.show();
}

function removeDiv(elem){
var pCount = $('.template-view', '#target_list').length;
if (pCount != 1)
{
$(elem).closest('.template-view').remove();
}
};

$('.add').live('click', function(){
addDiv();
});

$('.remove').live('click', function(){
removeDiv(this);
});

$(document).ready(addDiv);

</script>

MFB MFB
Answer

Chrome wants to focus on a control that is required but still empty so that it can pop up the message 'Please fill out this field'. However, if the control is hidden at the point that Chrome wants to pop up the message, that is at the time of form submission, Chrome can't focus on the control because it is hidden, therefore the form won't submit.

So, to get around the problem, when a control is hidden by javascript, we also must remove the 'required' attribute from that control.