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Customize Email's regardingobjectid lookup dropdown

I've tried customizing Email's regardingobjectid lookup dropdown, using the following code:
var regardingobjectid = Xrm.Page.getControl("regardingobjectid");
/* The value of viewId is a dummy value,
and only needs to be unique among the other available views for the lookup. */
var viewId = '{00000000-0000-0000-0000-000000000001}';
var entityName = 'lu_service';
var viewDisplayName = 'service - custom view';
var fetchXml =
'<fetch version="1.0" output-format="xml-platform" mapping="logical" distinct="true" >' +
'<entity name="lu_service">' +
'<attribute name="lu_serviceid" />' +
'<attribute name="lu_name" />' +
'<attribute name="createdon" />' +
'<order attribute="lu_name" descending="false" />' +
'</entity>' +
'</fetch>';
var lookupService = new RemoteCommand("LookupService", "RetrieveTypeCode");
lookupService.SetParameter("entityName", "lu_service");
var result = lookupService.Execute();
var objectTypeCode = result.ReturnValue;
var layoutXml =
'<grid name="resultset" object="' + objectTypeCode + '" jump="lu_name" select="1" icon="1" preview="1">' +
'<row name="lu_service" id="lu_serviceid">' +
'<cell name="lu_name" width="300" />' +
'<cell name="createdon" width="125" />' +
'</row>' +
'</grid>';
regardingobjectid.addCustomView(viewId, entityName, viewDisplayName, fetchXml, layoutXml, true);
I thought that this code should do two things:
1. Customize the lookup dropdown, i.e., display the records of the required type (in my example: lu_service) on the dropdown displayed when clicking the lookup field.
2. Add a custom view onto the window opened when clicking the "Look Up More Records" link (listed at the end of the lookup dropdown).
The result is that 1 doesn't work, and 2 works.
My question is: Should've 1 worked? If not, is it possible to achieve this?

For point #1 in 2015 version, you have to use addPreSearch and addCustomFilter to filter out the unwanted entities in the dropdown list. This is the only supported way/workaround. Read more
For example, the below filter will show lu_service & remove any account from regardingobjectid lookup. Trick is account will not have null accountid.
var serviceFilter = "<filter type='and'><condition attribute='lu_serviceid' operator='not-null' /></filter>";
//remove accounts
var accountFilter = "<filter type='and'><condition attribute='accountid' operator='null' /></filter>";
Xrm.Page.getControl('regardingobjectid').addCustomFilter(serviceFilter, "lu_service");
Xrm.Page.getControl('regardingobjectid').addCustomFilter(accountFilter, "account");

Making string content strikethrough in Google Apps

I'm faced with a trivial but not-quick-to-get thing: I need to set the font of a string as a strike-through style.
I've tried search for similar solution on Stackoverflow but it wasn't much instructive and helpful.
What I do have:
var bookingDetails = "\nЗаезд: " + row[0] + "\nВыезд: " + row[1] + "\nНомер: " + "«" + row[2] + "»" + "\nТип размещения: " + row[3] + "\n" + "\nЦена за ночь: " + row[4] + " руб." + "\nВнесённый депозит: " + row[8] + " руб." + "\n" + "\nИмя и фамилия гостя: " + row[5] + "\nМобильный телефон: " + row[6] + "\nЭлектронная почта: " + row[7] + "\n" + "\nПримечание: " + row[11];
I need to make the content of bookingDetails striked out without changing anything in the sheet itself. I tried bookingDetails.setFontLine("line-through") but it didn't help by showing the error of "TypeError: Cannot find function setFontLine in object...".
Please, help me fix it.
Just letting you know that I'm very thankful for your attempt to help me in advance.
UPD № 1: I'm using Google Spreadsheets. If it does make sense.
UPD № 2: If it is not possible to make this strike-through transformation just in the script not explicitly in cells then I should add that bookingDetails is used in the email body to be sent through MailApp.sendEmail. So if it possible to transform the contents of bookigndbetails directly in the message body then let me know how to make it as quick as possible on the example of my script.
Hoping that know my goal is clear.

Here is a function that will set strikethrough the text
function setStrikethrough(range) {
var ss = SpreadsheetApp.getActiveSpreadsheet(); // Get the current spreadsheet.
var sheet = ss.getSheets()[0]; // Select the first sheet.
var cell = sheet.getRange(range); // Use supplied arguments
cell.setFontLine("line-through"); // set strikethrough
}
You can call this method like this (this will set the line style of the given range to 'line-through'):
// specify the range
setStrikethrough("B2:C4");
See https://developers.google.com/apps-script/reference/spreadsheet/

How to check two parameters in li:contains method

I am using this method to change CSS
$("#AllProducts li:contains('" + Product + "')").css("background", "white");
This works fine, but now I need to check two parameters when I change CSS like below
$("#AllProducts li:contains('" + Product + "')&&('" + iCategory + "') ").css("background", "white");
However, this doesn't work. I can't check if contains product and then if iCategory, I need them to be in the same object.

I think you are looking for something like this. Short answer, try this:
$("#AllProducts li:contains('" + Product + "'):contains('" + iCategory + "') ")

What about:
$("#AllProducts li:contains('" + Product + "'):contains('" + iCategory + "')").css("background", "white");

Removing rows that do not contain search-term with jQuery

I'm using the following JQuery to filter rows on a datatable, which works fine...
yuiDtFilter = function(tableDivId, filter) {
//custom jQuery function defines case-insensitive fn:Contains, use default fn:contains for case-sensitive search
jQuery.expr[':'].Contains = function(a,i,m){
return jQuery(a).text().toUpperCase().indexOf(m[3].toUpperCase())>=0;
};
$("#" + tableDivId + " .yui-dt-data").find('tr').hide();
$("#" + tableDivId + " .yui-dt-data").find('td:Contains("' + filter + '")').parents('tr').show();
}
However I have a need for the filter work in the opposite way. I need it to remove rows that don't match the search terms.
I've found out that I need to use 'not()', but I've spent most of the day in vain trying to get it to work (using every example I can find).
I've tried many variations of -
$("#" + tableDivId + " .yui-dt-data")
.find(:not(('td:Contains("' + filter + '")'))
.parents('tr').remove();
Could anyone give me a hand using my code as a starting point?

Try
$("#" + tableDivId + " .yui-dt-data").find('td').not(':contains("' + filter + '")').parents('tr').remove();
or
$("#" + tableDivId + " .yui-dt-data").find( 'td:not(:contains("' + filter + '"))' ).parents('tr').remove()

Remove row from HTML table that doesn't contains specific text or string using jquery.
Note: If there are only two column in HTML table, we can use "last-child" attribute to find.
*$(document).ready(function(){
$("#tabledata tbody .mainTR").each(function(){
var lastTD = $(this).find("td:last-child");
var lastTdText = lastTD.text().trim();
if(!lastTdText.includes("DrivePilot")){
$(this).remove();
}
});
});
Note: If there are more than two column in HTML table, we can use "nth-child(2)" attribute to find.
Passing column index with "nth-child(column index)"
$(document).ready(function(){
$("#tabledata tbody .mainTR").each(function(){
var lastTD = $(this).find("td:nth-child(2)");
var lastTdText = lastTD.text().trim();
if(!lastTdText.includes("DrivePilot")){
$(this).remove();
}
});
});
Note: "DrivePilot" is nothing but text or string

iterate through form elements in javascript/jquery

I am trying to iterate through all form elements with id that begins with a specified prefix and create an xml string with results, but it is getting a bit complicated as forms form input types seem to have different behaviors . Does this functionality already javascript, jQuery or third party jQuery module?
function fnPreIterate(){
var XMLstring;
$(':input[id*="f1"]').each(function() {
XMLstring += (" <" +this.name+ '>' + this.value + "</" + this.name + "> " );
});
$('#XMLstring').html("<pre>" + fnEncodeEntities(string) + "</pre>");
};

If you use:
$(this).val()
instead of
this.value
you'll save a lot of headaches with difference in form elements.
Another way to iterate is to use .serializeArray():
$.each($('#form').serializeArray(), function() {
string += (" <" +this.name+ '>' + this.value + "</" + this.name + "> " );
});
Hope this helps. Cheers
PS: To select by prefix, you should do $(':input[id^="f1"]') (use ^ instead of *)

Use $(this).val() to get the value.
Additionally you mixed up XMLString and string which results in your code creating a global variable and failing when it's called a second time.

Using jQuery you should try:
function fnPreIterate(){
var XMLstring='';
$(':input[id^="f1"]').each(function() {
var e = $(this), name=e.attr('name'), val=e.val();
XMLstring += (" <" +name+ '>' + val + "</" + name + "> " );
});
$('#XMLstring').html("<pre>" + fnEncodeEntities(XMLstring) + "</pre>");
};
I think it should work

You could make use of jQuery's serializeArray.

What is the problem you are facing?
try using $(this) selector in your function instead. something like this
$(this).attr('name') and $(this).val()