How do I create a label field that shows a warning or not?

Hi Amy Cox

Perhaps you may prefer to apply the custom Dependency SetColor.

Save the code bellow in the file custom/include/Expressions/Actions/SetColorAction.php

<?php
/*
 * Your installation or use of this SugarCRM file is subject to the applicable
 * terms available at
 * http://support.sugarcrm.com/Resources/Master_Subscription_Agreements/.
 * If you do not agree to all of the applicable terms or do not have the
 * authority to bind the entity as an authorized representative, then do not
 * install or use this SugarCRM file.
 *
 * Copyright (C) SugarCRM Inc. All rights reserved.
 */

/**
 * Class SetColorAction
 *
 * SugarLogic Action to set a color to a field
 */

require_once("include/Expressions/Actions/AbstractAction.php");

class SetColorAction extends AbstractAction
{
	/**
	 * Store the expression
	 *
	 * @var mixed|string
	 */
	protected $expression = '';

	/**
	 * The field we are targeting
	 *
	 * @var string
	 */
	protected $targetField = '';

	/**
	 * All colors which may be returned by given expression
	 *
	 * @var string
	 */
	protected $colors = '';


	/**
	 * Constructor
	 *
	 * @param array $params
	 */
	public function __construct($params)
	{
		$this->targetField = $params['target'];
		$this->expression = str_replace("\n", '', $params['value']);
		$this->colors = str_replace("\n", '', $params['colors']);
	}

	/**
	 * Returns the javascript class equivalent to this php class
	 *
	 * @return string javascript.
	 */
	public static function getJavascriptClass()
	{
		return <<<JS
		SUGAR.forms.SetColorAction = function(target, valExpr, colorsExpr) {
			if(_.isObject(target)) {
				this.expr = target.value;
				this.target = target.target;
				this.colors = target.colors;
			} else {
				this.expr = valExpr;
				this.target = target;
				this.colors = colorsExpr;
			}
		};
		SUGAR.util.extend(SUGAR.forms.SetColorAction, SUGAR.forms.AbstractAction, {
			exec : function(context) {
				if(typeof(context) == 'undefined') context = this.context;

				context.target = this.target;

				var value = this.evalExpression(this.expr, context), colors = this.evalExpression(this.colors, context);

				_.each(colors, function(color) {
					context.removeClass(this.target, color, false);
				}, this);

				if(!_.isUndefined(value) && !_.isEmpty(value)) context.addClass(this.target, value, false);
			}
		});
JS;
	}

	/**
	 * Returns the javascript code to generate this actions equivalent.
	 *
	 * This is used for BWC modules only
	 *
	 * @return string javascript.
	 */
	public function getJavascriptFire()
	{
		return "new SUGAR.forms.SetColorAction('{$this->targetField}','" . addslashes($this->expression) . "', '{$this->colors}')";
	}

	/**
	 * Applies the Action to the target.
	 *
	 * @param SugarBean $target
	 */
	public function fire(&$target)
	{
		//This is a no-op under PHP
	}

	/**
	 * Returns the definition of this action in array format.
	 *
	 * @return array
	 */
	public function getDefinition()
	{
		return array(
			'action' => $this->getActionName(),
			'params' => array(
				'target' => $this->targetField,
				'value' => $this->expression,
				'colors' => $this->colors
			)
		);
	}

	/**
	 * The Action Name
	 *
	 * @return string
	 */
	public static function getActionName()
	{
		return 'SetColor';
	}
}

Create the file custom/Extension/<module>/Ext/Dependencies/SetColor.php with content bellow, obviously update it accordingly:

<?php
$dependencies['Products']['setcolor'] = [
	'hooks' => ["edit", "view"],
	'trigger' => 'equal($the_field_c, true)',
	'triggerFields' => ['the_field_c'],
	'onload' => true,
	'actions' => [
		[
			'name' => 'SetColor',
			'params' => [
				'target' => 'the_field_c',
				'value' => '"label red"',
				'colors' => 'createList("label red")',
				'errorValue' => '"label red"',
			],
		],
	],
];

?>

Run the following repair actions:

• Quick Repair and Rebuild
• Rebuild Sugar Logic Functions
• Rebuild Javascript Languages
• Rebuild JS Grouping Files
• Clear Additional Cache

Finally clear browser cache and enjoy it.

You can use the "related" Sugar Logic function in the trigger line of André's code to get the value of the field in the parent module.

You can use the "related" Sugar Logic function in the trigger line of André's code to get the value of the field in the parent module.