Best way to add a dynamic grid as input in custom extension Adminhtml

It took me way to long to realize that Tier prices looks the way I want. So after looking into how Magento does it with Tier pricing I ended up doing the following. Sorry in advance for the huge blocks of code but I thought it might be interesting for future reference.

In my form class Redkiwi_Rkstorelocator_Block_Adminhtml_Rkstorelocator_Edit_Tab_General

class Redkiwi_Rkstorelocator_Block_Adminhtml_Rkstorelocator_Edit_Tab_General extends Mage_Adminhtml_Block_Widget_Form
{
    protected function _prepareForm()
    {
        $form = new Varien_Data_Form();
        $this->setForm($form);
        $fieldset = $form->addFieldset('rkstorelocator_form', array('legend'=>Mage::helper('rkstorelocator')->__('Store information')));

        [...]

        $officehours_field = $fieldset->addField('office_hours', 'text', array(
            'name'      => 'office_hours',
            'label'     => Mage::helper('rkstorelocator')->__('Office hours'),
            'required'  => false,
        ));

        $office_hours = $form->getElement('office_hours');

        $office_hours->setRenderer(
            $this->getLayout()->createBlock('rkstorelocator/adminhtml_rkstorelocator_edit_renderer_officehours')
        );


        [...]
    }
}

Now for the Office hours block class Redkiwi_Rkstorelocator_Block_Adminhtml_Rkstorelocator_Edit_Renderer_Officehours.

class Redkiwi_Rkstorelocator_Block_Adminhtml_Rkstorelocator_Edit_Renderer_Officehours
 extends Mage_Adminhtml_Block_Widget
 implements Varien_Data_Form_Element_Renderer_Interface
{

    /**
     * Initialize block
     */
    public function __construct()
    {
        $this->setTemplate('rkstorelocator/officehours.phtml');
    }

    /**
     * Render HTML
     *
     * @param Varien_Data_Form_Element_Abstract $element
     * @return string
     */
    public function render(Varien_Data_Form_Element_Abstract $element)
    {
        $this->setElement($element);
        return $this->toHtml();
    }

}

And the template .phtml file adminhtml/default/default/template/rkstorelocator/officehours.phtml

<?php 
$_htmlId      = $this->getElement()->getHtmlId();
$_htmlClass   = $this->getElement()->getClass();
$_htmlName    = $this->getElement()->getName();
$_readonly    = $this->getElement()->getReadonly();

$collection = Mage::registry('rkstorelocator_data')
                ->getOpeningHours()
                ->setOrder('sortorder', 'ASC');

$_counter = 0;
?>
<tr>
    <td class="label"><?php echo $this->getElement()->getLabel() ?></td>
    <td colspan="10" class="grid hours">
        <table id="attribute-options-table" class="dynamic-grid rkstorelocator-officehours" cellspacing="0" cellpadding="0"><tbody>
            <tr>
                <th><?php echo $this->__('Day label') ?></th><th><?php echo $this->__('Opening hour') ?></th><th><?php echo $this->__('Closing hour') ?></th><th><?php echo $this->__('Sortorder') ?></th>
                <th><button id="add_new_option_button" title="Add Option" type="button" class="scalable add"><span><span><span><?php echo $this->__('Add Option') ?></span></span></span></button></th>
            </tr>
<?php foreach ($collection as $_item): ?>
<tr class="option-row rkstorelocator-officehours-dayrow" id="hour-row-<?php echo $_counter?>">
    <td><input name="<?php echo $_htmlName; ?>[value][option_<?php echo $_counter ?>][dayindicator]" value="<?php echo $_item->getDayindicator() ?>" class="input-text" type="text"></td>
    <td><input name="<?php echo $_htmlName; ?>[value][option_<?php echo $_counter ?>][openinghour]" value="<?php echo $_item->getOpeninghour() ?>" class="input-text" type="text"></td>
    <td><input name="<?php echo $_htmlName; ?>[value][option_<?php echo $_counter ?>][closinghour]" value="<?php echo $_item->getClosinghour() ?>" class="input-text" type="text"></td>
    <td><input name="<?php echo $_htmlName; ?>[value][option_<?php echo $_counter ?>][sortorder]" value="<?php echo $_item->getSortorder() ?>" class="input-text" type="text"></td>
    <td class="a-left" id="delete_button_container_option_<?php echo $_counter ?>'">
        <input name="<?php echo $_htmlName; ?>[value][option_<?php echo $_counter ?>][id]" value="<?php echo $_item->getId() ?>" type="hidden">
        <input id="delete-row-<?php echo $_counter ?>" type="hidden" class="delete-flag" name="<?php echo $_htmlName; ?>[delete][option_<?php echo $_counter ?>]" value=""/>
        <button onclick="$('hour-row-<?php echo $_counter ?>').style.display='none'; $('delete-row-<?php echo $_counter ?>').setValue(1);" title="Delete" type="button" class="scalable delete delete-option"><span><span><span>Delete</span></span></span></button>
    </td>
</tr>
<?php
        $_counter++;
    endforeach;
?>
</tbody></table>

<script type="text/javascript">//<![CDATA[

var _form_html_row = '<tr class="option-row rkstorelocator-officehours-dayrow" id="hour-row-{{id}}"><td><input name="<?php echo $_htmlName; ?>[value][option_{{id}}][dayindicator]" value="" class="input-text" type="text"></td><td><input name="<?php echo $_htmlName; ?>[value][option_{{id}}][openinghour]" value="" class="input-text" type="text"></td><td><input name="<?php echo $_htmlName; ?>[value][option_{{id}}][closinghour]" value="" class="input-text" type="text"></td><td><input name="<?php echo $_htmlName; ?>[value][option_{{id}}][sortorder]" value="" class="input-text" type="text"></td><td class="a-left" id="delete_button_container_option_{{id}}"><input name="<?php echo $_htmlName; ?>[value][option_{{id}}][id]" value="" type="hidden"><input id="delete-row-{{id}}" type="hidden" class="delete-flag" name="<?php echo $_htmlName; ?>[delete][option_{{id}}]" value=""/><button onclick="$(\'hour-row-{{id}}\').style.display=\'none\'; $(\'delete-row-{{id}}\').setValue(1);" title="Delete" type="button" class="scalable delete delete-option"><span><span><span>Delete</span></span></span></button></td></tr>';

var _rkstorelocator_counter = <?php echo $_counter?>;

$('add_new_option_button').observe('click', function(){
    $('attribute-options-table').insert(_form_html_row.replace(/\{\{id\}\}/ig, _rkstorelocator_counter));
    _rkstorelocator_counter++;
});

//]]></script>
    </td>
</tr>

And the result: enter image description here

Dear future Googlers, By the time you read this Magento 2.x will be released. Let's hope Magento has made this kind of stuff a little bit easier. :)


I give some of my codes written based on Magento templates. Maybe it will be useful.
Some tab interface:

<?php
class Ssd_Shower_Block_Adminhtml_Shower_Edit_Tab_Options
    extends Mage_Adminhtml_Block_Template
    implements Mage_Adminhtml_Block_Widget_Tab_Interface
{

    /** set own teplate */
    public function __construct()
    {
        $this->setTemplate('pregnancy/list/options.phtml');
    }

    /** here some implementation of tab interfeys */


    /** options for every row, they will be rendered as dynamic row with inputs */
    public function getOptionValues()
    {
        $period=$this->getData('period');
        $optionsArr = Mage::helper('shower')->getTipList($period);

        $values = array();
        foreach ($optionsArr as $option) {

            $value = array();
            $value['id'] = $option->getId();
            $value['period_id'] = $period->getId();
            $value['tip_content'] = $option->getTip_content();
            $value['sort_order'] = $option->getSort_order();
            $value['update'] = 1;

            $values[] = new Varien_Object($value);
        }

        return $values;
    }

}

?>

And pregnancy/list/options.phtml template:

<div class="entity-edit" id="manage-options-panel">
    <div class="entry-edit-head">
        <h4 class="icon-head head-edit-form fieldset-legend">Some title</h4>
    </div>
    <div class="box">
        <div class="hor-scroll">
            <table class="dynamic-grid" cellspacing="0" cellpadding="0" width="100%">
                <tr id="grid_head">
                    <th style="width:90%!important"><?php echo Mage::helper('pregnancy')->__('Checklist Items') ?></th>
                    <th class="w-150"><?php echo Mage::helper('pregnancy')->__('Position') ?></th>
                    <th class="w-150">
                        <button id="add_new_option_button" class="scalable add" style="" onclick="" type="button">
                            <span><?php echo Mage::helper('pregnancy')->__('Add Checklist Item') ?></span>
                        </button>
                    </th>
                </tr>
                <tr id="attribute-options-table">
                </tr>
                <tr class="no-display template" id="row-template">
                    <td><input name="tip[{{id}}][tip_content]"
                               value="{{tip_content}}"
                               class="input-text required-option full"
                               type="text" disabled="disabled"/></td>

                    <td class="a-center"><input class="input-text" type="text" name="tip[{{id}}][sort_order]"
                                                value="{{sort_order}}"/></td>
                    <td class="a-left">
                        <input type="hidden" class="delete-flag" name="tip[{{id}}][delete]" value=""/>
                        <input type="hidden" class="update-flag" name="tip[{{id}}][update]" value="{{update}}"/>
                        <button class="scalable delete delete-option" type="button"><span>Delete</span></button>
                    </td>
                </tr>
            </table>
        </div>
        <input type="hidden" id="option-count-check" value=""/>
    </div>
</div>

<script type="text/javascript">
    //<![CDATA[
    var optionDefaultInputType = 'text';
    //template for dynamic row
    var templateText =
            '<tr class="option-row">' +
                    '<td><input name="tip[{{id}}][tip_content]" value="{{tip_content}}" class="input-text required-option full" type="text"/><\/td>' +
                    '<td><input class="input-text" type="text" name="tip[{{id}}][sort_order]" value="{{sort_order}}"/><\/td>' +
                    '<td class="a-left">' +
                    '<input type="hidden" class="delete-flag" name="tip[{{id}}][delete]" value="" />' +
                    '<input type="hidden" class="update-flag" name="tip[{{id}}][update]" value="{{update}}"/>' +
                    '<button class="scalable delete delete-option" type="button"><span><?=$this->__("Delete")?></span></button>' +
                    '<\/td>' +
                    '<\/tr>';

    var attributeOption = {
        table : $('attribute-options-table'),
        templateSyntax : /(^|.|\r|\n)({{(\w+)}})/,
        templateText : templateText,
        itemCount : 0,
        totalItems : 0,
        //add dynamic row function
        add : function(data) {
            this.template = new Template(this.templateText, this.templateSyntax);
            if (!data.id) {
                data = {};
                data.id = 'option_' + this.itemCount;
            }
            if (!data.intype)
                data.intype = optionDefaultInputType;

            Element.insert(this.table, {before: this.template.evaluate(data)});
            this.bindRemoveButtons();
            this.itemCount++;
            this.totalItems++;
            this.updateItemsCountField();
        },
        //remove dynamic row function
        remove : function(event) {
            if (confirm('<?php echo $this->__("Do you really delete this tip?");?>')) {
                var element = $(Event.findElement(event, 'tr'));
                element.ancestors().each(function(parentItem) {
                    if (parentItem.hasClassName('option-row')) {
                        element = parentItem;
                        throw $break;
                    } else if (parentItem.hasClassName('box')) {
                        throw $break;
                    }
                });

                if (element) {
                    var elementFlags = element.getElementsByClassName('delete-flag');
                    if (elementFlags[0]) {
                        elementFlags[0].value = 1;
                    }

                    element.addClassName('no-display');
                    element.addClassName('template');
                    element.hide();
                    this.totalItems--;
                    this.updateItemsCountField();
                }
            }
        },
        updateItemsCountField: function() {
            if (this.totalItems > 0) {
                $('option-count-check').value = '1';
            } else {
                $('option-count-check').value = '';
            }
        },
        bindRemoveButtons : function() {
            var buttons = $$('.delete-option');
            for (var i = 0; i < buttons.length; i++) {
                if (!$(buttons[i]).binded) {
                    $(buttons[i]).binded = true;
                    Event.observe(buttons[i], 'click', this.remove.bind(this));
                }
            }
        }

    }
    if ($('row-template')) {
        $('row-template').remove();
    }
    attributeOption.bindRemoveButtons();

    if ($('add_new_option_button')) {
        Event.observe('add_new_option_button', 'click', attributeOption.add.bind(attributeOption));
    }
    Validation.addAllThese([
        ['required-option', '<?php echo Mage::helper('pregnancy')->__('Failed') ?>', function(v) {
            return !Validation.get('IsEmpty').test(v);
        }]
    ]);
    Validation.addAllThese([
        ['required-options-count', '<?php echo Mage::helper('pregnancy')->__('Options is required') ?>', function(v) {
            return !Validation.get('IsEmpty').test(v);
        }]
    ]);
<?php
    /** pulling data from Ssd_Shower_Block_Adminhtml_Shower_Edit_Tab_Options **/
    if ($options = $this->getOptionValues()) {
        foreach ($options as $_value): ?>
        attributeOption.add(<?php echo $_value->toJson() ?>);
    <?php endforeach; } ?>
    //]]>
</script>