I have the following codes:


<aura:event access="global" type="COMPONENT" description="Event template" >
<aura:attribute name="data" type="String"/>
<aura:attribute name="sample"   type="String"/>


<aura:component >
<aura:handler name="TEST_Event" event="c:testevent" action="{!c.handleComponentEvent}"/>
<aura:attribute name="dataValue" type="String" default="testselect"/>
<aura:attribute name="sampl" type="String" />

<aura:if isTrue="{!v.dataValue == 'testselect'}">
<aura:if isTrue="{!v.dataValue == 'testcomp2'}">
        <c:testcomp2 testdata="{!v.sampl}"/>

testcomp controller js:

handleComponentEvent : function(component, event) {
    var cmpdata = event.getParam("data");
    component.set("v.dataValue", cmpdata);

    var cmpmm = event.getParam("sample");
    component.set("v.sampl", cmpmm);

    console.log('dataValue '+component.get("v.dataValue"));
    console.log('msg '+component.get("v.sampl"));


<aura:component >
<aura:registerEvent name="TEST_Event" type="c:testevent"/>
<table class="slds-table slds-table_cell-buffer slds-table_bordered">
        <tr ><th ><div >Sample Table</div></th></tr>
    <tbody><tr class="slds-hint-parent"><th  data-label="Batch Donation Form Name" scope="row">
                    <div class="slds-truncate" ><a aura:id="sampleId" data-value="id12345" onclick="{!c.gotoNext}">message 1</a></div>

testselect controller js:

gotoNext:function(component, event, helper){
var trId = event.currentTarget.dataset.value;
console.log('trId '+trId);
var nextpage = "testcomp2";
var cmpEvent = component.getEvent("TEST_Event");
    "data" : nextpage,
    "sample" : trId});


<aura:component >
<aura:registerEvent name="TEST_Event" type="c:testevent"/>
<aura:attribute name="testdata" type="String" />
<label>Output data here: {!v.testdata}</label>

<aura:handler name="init" action="{!c.doInit}" value="{!this}" />

testcomp2 controller js:

doInit : function(component, event, helper) {
   var sid = event.getParam("sample");
   console.log('testdata '+component.get("v.testdata"));

it worked well and the sample value is displayed but when I get the value - component.get("v.testdata"), it gets an undefined value. I'm supposed to use it for my query but I didnt get any value though it displays in the page. what might went wrong?


doInit is called before your component would receive any other event-based data. In fact, it's called even before it's rendered and becomes part of the DOM. All of this means that what you're looking for is a value change handler:

<aura:handler name="change" action="{!c.checkChange}" value="{!v.testdata}" />

checkChange: function(component, event, handler) {
  // new value will be here
  var data = component.get("v.testdata");

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