Thanks Cris!  I am trying to use this in the onChange script that I created to compare the short description and description.  I am getting a javascript error on the portal record producer though.

Here is the onChange client script.  Also, how to I add an alert popup if the description is under 251 characters?

function onChange(control, oldValue, newValue, isLoading, isTemplate) {


    if (isLoading || newValue === '') {
          return;
    }

    //Verify that Short Description and Description are not the same

        var title = g_form.getValue('short_description');
        if(title == newValue)
        {
                  alert('Description cannot be the same as the short description.  Please enter additional information.');
                  g_form.clearValue('description');
        } 
	
	//Verify that Description is at least 250 characters

		var ga = new GlideAjax('CPcheckDescriptionLength'); //The name of the Script Include
		ga.addParam('sysparm_name', 'isLengthSatisified'); //The name of the method we want to use in the SI
		ga.addParam('sysparm_sd', g_form.getValue('description')); //Pass your description to the param we define in the SI
		ga.getXMLAnswer(function(response){ //Callback function to use the 'response' from our SI
			jslog(response); //Will be true or false
		});
 
}

I tried this with the onLoad script and cannot get it to work.  I get a javascript error when the record producer loads

Have you considered using a variable set for this?

The variable set would only contain a single field - Description, and the client script.

I ended up creating a variable set with the 2 variables and catalog client script and it works well.  Thank you for the help!