有的时候标准的满足不了客户需求，比如客户想在knowledge上看外部数据，因为需要创建external lookup，因为knowledge不支持创建external lookup，另外formula也不支持external object，这时候我们需要自定义一个lookup来满足客户需求。
1.Create Apex Class Controller.customLookUpController.apxc
代码语言：javascript复制public class customLookUpController {
@AuraEnabled
public static List < sObject > fetchLookUpValues(String searchKeyWord, String ObjectName) {
system.debug('ObjectName-->' ObjectName);
String searchKey = searchKeyWord '%';
List < sObject > returnList = new List < sObject > ();
// Create a Dynamic SOQL Query For Fetch Record List with LIMIT 5
String sQuery = 'select id, Name from ' ObjectName ' where Name LIKE: searchKey order by createdDate DESC limit 5';
List < sObject > lstOfRecords = Database.query(sQuery);
for (sObject obj: lstOfRecords) {
returnList.add(obj);
}
return returnList;
}
}2.Create Lightning Event selectedsObjectRecordEvent.evt
代码语言：javascript复制<aura:event type="COMPONENT" description="by this event we are pass the selected sObject(lookup list record) in the parent component">
<aura:attribute name="recordByEvent" type="sObject"/>
</aura:event>3.Create Child Component For Display the Search Result List customLookupResult.cmp
代码语言：javascript复制<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global">
<aura:attribute name="oRecord" type="sObject" />
<aura:attribute name="IconName" type="string"/>
<!--Register the component level event-->
<aura:registerEvent name="oSelectedRecordEvent" type="c:selectedsObjectRecordEvent"/>
<li role="presentation" class="slds-listbox__item" onclick="{!c.selectRecord}">
<span id="listbox-option-unique-id-01" class="slds-media slds-listbox__option slds-listbox__option_entity slds-listbox__option_has-meta" role="option">
<span class="slds-media__figure">
<span class="slds-icon_container" title="Description of icon when needed">
<lightning:icon iconName="{!v.IconName}" class="slds-icon slds-icon_small" size="small" alternativeText="icon"/>
<span class="slds-assistive-text">Description of icon</span>
</span>
</span>
<span class="slds-media__body">
<span class="slds-listbox__option-text slds-listbox__option-text_entity">{!v.oRecord.Name}</span>
</span>
</span>
</li>
</aura:component>JS ControllercustomLookupResultController.js
代码语言：javascript复制({
selectRecord : function(component, event, helper){
// get the selected record from list
var getSelectRecord = component.get("v.oRecord");
// call the event
var compEvent = component.getEvent("oSelectedRecordEvent");
// set the Selected sObject Record to the event attribute.
compEvent.setParams({"recordByEvent" : getSelectRecord });
// fire the event
compEvent.fire();
},
})4.Create Lightning Custom Lookup Component Parent customLookup.cmp
代码语言：javascript复制<aura:component controller="customLookUpController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global">
<!--declare attributes-->
<aura:attribute name="selectedRecord" type="sObject" default="{}" description="Use,for store SELECTED sObject Record"/>
<aura:attribute name="listOfSearchRecords" type="List" description="Use,for store the list of search records which returns from apex class"/>
<aura:attribute name="SearchKeyWord" type="string"/>
<aura:attribute name="objectAPIName" type="string" default=""/>
<aura:attribute name="IconName" type="string" default=""/>
<aura:attribute name="label" type="string" default=""/>
<aura:attribute name="Message" type="String" default=""/>
<!--declare events hendlers-->
<aura:handler name="oSelectedRecordEvent" event="c:selectedsObjectRecordEvent" action="{!c.handleComponentEvent}"/>
<!-- https://www.lightningdesignsystem.com/components/lookups/ -->
<div onmouseleave="{!c.onblur}" aura:id="searchRes" class="slds-form-element slds-lookup slds-is-close" data-select="single">
<label class="slds-form-element__label" for="lookup-348">{!v.label}</label>
<!--This part is for display search bar for lookup-->
<div class="slds-form-element__control">
<div class="slds-input-has-icon slds-input-has-icon--right">
<!-- This markup is for when an record is selected -->
<div aura:id="lookup-pill" class="slds-pill-container slds-hide">
<lightning:pill class="pillSize" label="{!v.selectedRecord.Name}" name="{!v.selectedRecord.Name}" onremove="{! c.clear }">
<aura:set attribute="media">
<lightning:icon iconName="{!v.IconName}" size="x-small" alternativeText="{!v.IconName}"/>
</aura:set>
</lightning:pill>
</div>
<div aura:id="lookupField" class="slds-show">
<lightning:icon class="slds-input__icon slds-show" iconName="utility:search" size="x-small" alternativeText="search"/>
<span class="slds-icon_container slds-combobox__input-entity-icon" title="record">
<lightning:icon class="slds-icon slds-icon slds-icon_small slds-icon-text-default" iconName="{!v.IconName}" size="x-small" alternativeText="icon"/>
<span class="slds-assistive-text"></span>
</span>
<ui:inputText click="{!c.onfocus}" updateOn="keyup" keyup="{!c.keyPressController}" class="slds-lookup__search-input slds-input leftPaddingClass" value="{!v.SearchKeyWord}" placeholder="search.."/>
</div>
</div>
</div>
<!--This part is for Display typehead lookup result List-->
<ul style="min-height:40px;margin-top:0px !important" class="slds-listbox slds-listbox_vertical slds-dropdown slds-dropdown_fluid slds-lookup__menu slds" role="listbox">
<lightning:spinner class="slds-hide" variant="brand" size="small" aura:id="mySpinner"/>
<center> {!v.Message}</center>
<aura:iteration items="{!v.listOfSearchRecords}" var="singleRec">
<c:customLookupResult oRecord="{!singleRec}" IconName="{!v.IconName}"/>
</aura:iteration>
</ul>
</div>
</aura:component>JS ControllercustomLookupController.js
代码语言：javascript复制({
onfocus : function(component,event,helper){
$A.util.addClass(component.find("mySpinner"), "slds-show");
var forOpen = component.find("searchRes");
$A.util.addClass(forOpen, 'slds-is-open');
$A.util.removeClass(forOpen, 'slds-is-close');
// Get Default 5 Records order by createdDate DESC
var getInputkeyWord = '';
helper.searchHelper(component,event,getInputkeyWord);
},
onblur : function(component,event,helper){
component.set("v.listOfSearchRecords", null );
var forclose = component.find("searchRes");
$A.util.addClass(forclose, 'slds-is-close');
$A.util.removeClass(forclose, 'slds-is-open');
},
keyPressController : function(component, event, helper) {
// get the search Input keyword
var getInputkeyWord = component.get("v.SearchKeyWord");
// check if getInputKeyWord size id more then 0 then open the lookup result List and
// call the helper
// else close the lookup result List part.
if( getInputkeyWord.length > 0 ){
var forOpen = component.find("searchRes");
$A.util.addClass(forOpen, 'slds-is-open');
$A.util.removeClass(forOpen, 'slds-is-close');
helper.searchHelper(component,event,getInputkeyWord);
}
else{
component.set("v.listOfSearchRecords", null );
var forclose = component.find("searchRes");
$A.util.addClass(forclose, 'slds-is-close');
$A.util.removeClass(forclose, 'slds-is-open');
}
},
// function for clear the Record Selaction
clear :function(component,event,heplper){
var pillTarget = component.find("lookup-pill");
var lookUpTarget = component.find("lookupField");
$A.util.addClass(pillTarget, 'slds-hide');
$A.util.removeClass(pillTarget, 'slds-show');
$A.util.addClass(lookUpTarget, 'slds-show');
$A.util.removeClass(lookUpTarget, 'slds-hide');
component.set("v.SearchKeyWord",null);
component.set("v.listOfSearchRecords", null );
component.set("v.selectedRecord", {} );
},
// This function call when the end User Select any record from the result list.
handleComponentEvent : function(component, event, helper) {
// get the selected Account record from the COMPONETN event
var selectedAccountGetFromEvent = event.getParam("recordByEvent");
component.set("v.selectedRecord" , selectedAccountGetFromEvent);
var forclose = component.find("lookup-pill");
$A.util.addClass(forclose, 'slds-show');
$A.util.removeClass(forclose, 'slds-hide');
var forclose = component.find("searchRes");
$A.util.addClass(forclose, 'slds-is-close');
$A.util.removeClass(forclose, 'slds-is-open');
var lookUpTarget = component.find("lookupField");
$A.util.addClass(lookUpTarget, 'slds-hide');
$A.util.removeClass(lookUpTarget, 'slds-show');
},
})JS HelpercustomLookupHelper.js
代码语言：javascript复制({
searchHelper : function(component,event,getInputkeyWord) {
// call the apex class method
var action = component.get("c.fetchLookUpValues");
// set param to method
action.setParams({
'searchKeyWord': getInputkeyWord,
'ObjectName' : component.get("v.objectAPIName")
});
// set a callBack
action.setCallback(this, function(response) {
$A.util.removeClass(component.find("mySpinner"), "slds-show");
var state = response.getState();
if (state === "SUCCESS") {
var storeResponse = response.getReturnValue();
// if storeResponse size is equal 0 ,display No Result Found... message on screen. }
if (storeResponse.length == 0) {
component.set("v.Message", 'No Result Found...');
} else {
component.set("v.Message", '');
}
// set searchResult list with return value from server.
component.set("v.listOfSearchRecords", storeResponse);
}
});
// enqueue the Action
$A.enqueueAction(action);
},
})Style Tab Code customLookup.CSS
代码语言：javascript复制.THIS .leftPaddingClass {
padding-left: 2rem;
}
.THIS .pillSize{
width:100%;
}How to Use – Example Custom Lookup Component
Now we are create a simple and small Lightning Componentto create Contact Record Using custom Account Lookup and Name field.
Apex Controller
代码语言：javascript复制public class contactSaveCtrl {
@AuraEnabled
public static void saveContact(Contact con){
insert con;
}
}Lightning Component
代码语言：javascript复制<aura:component controller="contactSaveCtrl" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global">
<aura:attribute name="selectedLookUpRecord" type="sObject" default="{}"/>
<aura:attribute name="objContact" type="contact" default="{'sobjectType':'contact'}"/>
<div class="slds-m-around_large">
<ui:inputText class="slds-input" value="{!v.objContact.LastName}" label="Last Name"/>
<c:customLookup objectAPIName="account" IconName="standard:account" label="Account Name" selectedRecord="{!v.selectedLookUpRecord}"/>
<br/>
<button class="slds-utton slds-button_brand" onclick="{!c.saveContactRecord}">Save Contact</button>
</div>
</aura:component>JavaScript Controller
代码语言：javascript复制({
saveContactRecord : function(component, event, helper) {
var conObj = component.get("v.objContact");
//set the default accountId is null
conObj.AccountId = null ;
// check if selectedLookupRecord is not equal to undefined then set the accountId from
// selected Lookup Object to Contact Object before passing this to Server side method
if(component.get("v.selectedLookUpRecord").Id != undefined){
conObj.AccountId = component.get("v.selectedLookUpRecord").Id;
}
//call apex class method
var action = component.get('c.saveContact');
action.setParams({
'con': conObj
})
action.setCallback(this, function(response) {
//store state of response
var state = response.getState();
if (state === "SUCCESS") {
alert('Record Created');
}
});
$A.enqueueAction(action);
}
})
