Filter a lookup field by javascript, Microsoft dynamics CRM 2015

Today, i will talk about how to filter the result of a lookup field. Before we start note that you can filter your lookup field by the customisation that crm offer by double clicking on the lookup field on your form

But unfortuanlity, this customisation does not offer a lot of choices. To have hand free, you can implement what ever you want by javascript.

	OnLoad: function () {
	//Filter source lookup field
	FilterSourceField();
	},
	FilterSourceField: function () {
	Xrm.Page.getControl("source").addPreSearch(SourceFilter);
	},
	SourceFilter: function () {
	var Filter = "<filter type='and'><condition attribute='sourceName' operator='like' value='" %john% "' /></filter>";
	Xrm.Page.getControl("source").addCustomFilter(Filter);
	}