Receiving "synthetic event is reused" warning when navigating between scenes using redux sample code #1328

joeferraro · 2016-10-27T19:21:25Z

Version

Tell us which versions you are using:

react-native-router-flux v3.36.0
react-native v0.35.0

Expected behaviour

Navigating from one scene to another using the redux example should work without React performance warning

Actual behaviour

Receiving the following warning when navigating between scenes using the sample code provided: "Warning: This synthetic event is reused for performance reasons. If you're seeing this, you're accessing the property "type" on a released/nullified synthetic event. This is set to null. If you must keep the original synthetic event around, use event.persist()."

Steps to reproduce

Implement the sample code for redux found here, including the following in your first component:

<Text onPress={Actions.home}>Go home</Text>

Run the app and tap on Go home
App is directed to home view, but several warnings appear with the text above

The text was updated successfully, but these errors were encountered:

jamielob · 2016-11-10T19:00:21Z

@joeferraro I'm also seeing this - did you have any luck figuring out what was going on?

Almouro · 2016-11-16T09:34:05Z

I'm seeing the same thing :\

jamielob · 2016-11-24T08:45:00Z

@joeferraro @Almouro - I've found that changing from

onPress={Actions.otherScene}

to

onPress={() => Actions.otherScene()}

has removed with these errors.

Almouro · 2016-11-24T10:13:02Z

Thanks @jamielob, this was the problem for me too. :)

gustavjf · 2017-01-30T15:14:58Z

Thanks @jamielob.

I wonder why the mini tutorial uses onPress={Actions.Foo} instead. Could there be a reason for that?

EliCDavis · 2017-06-14T18:50:01Z

jamielob's suggestion fixed the error for me.

Noob here though, what's going on differently under the hood when you pass it an anonymous function vs an actual reference.

…#10,#11,#12,#13,#14,#15,#16,#17,#18,#19,#20,#21,#22,#23,#24,#25,#26,#27,#28,#29,#30,#31,#32,#33,#34,#35,#36,#37,#38,#39,#40,#41,#42,#43,#44,#45,#46,#47,#48,#49,#50,#51,#52,#53,#54,#55,#56,#57,#58,#59,#60,#61,#62,#63,#64,#65,#66,#67,#68,#69,#70,#71,#72,#73,#74,#75,#76,#77,#78,#79,#80,#81,#82,#83,#84,#85,#86,#87,#88,#89,#90,#91,#92,#93,#94,#95,#96,#97,#98,#99,#100,#101,#102,#103,#104,#105,#106,#107,#108,#109,#110,#111,#112,#113,#114,#115,#116,#117,#118,#119,#120,#121,#122,#123,#124,#125,#126,#127,#128,#129,#130,#131,#132,#133,#134,#135,#136,#137,#138,#139,#140,#141,#142,#143,#144,#145,#146,#147,#148,#149,#150,#151,#152,#153,#154,#155,#156,#157,#158,#159,#160,#161,#162,#163,#164,#165,#166,#167,#168,#169,#170,#171,#172,#173,#174,#175,#176,#177,#178,#179,#180,#181,#182,#183,#184,#185,#186,#187,#188,#189,#190,#191,#192,#193,#194,#195,#196,#197,#198,#199,#200,#201,#202,#203,#204,#205,#206,#207,#208,#209,#210,#211,#212,#213,#214,#215,#216,#217,#218,#219,#220,#221,#222,#223,#224,#225,#226,#227,#228,#229,#230,#231,#232,#233,#234,#235,#236,#237,#238,#239,#240,#241,#242,#243,#244,#245,#246,#247,#248,#249,#250,#251,#252,#253,#254,#255,#256,#257,#258,#259,#260,#261,#262,#263,#264,#265,#266,#267,#268,#269,#270,#271,#272,#273,#274,#275,#276,#277,#278,#279,#280,#281,#282,#283,#284,#285,#286,#287,#288,#289,#290,#291,#292,#293,#294,#295,#296,#297,#298,#299,#300,#301,#302,#303,#304,#305,#306,#307,#308,#309,#310,#311,#312,#313,#314,#315,#316,#317,#318,#319,#320,#321,#322,#323,#324,#325,#326,#327,#328,#329,#330,#331,#332,#333,#334,#335,#336,#337,#338,#339,#340,#341,#342,#343,#344,#345,#346,#347,#348,#349,#350,#351,#352,#353,#354,#355,#356,#357,#358,#359,#360,#361,#362,#363,#364,#365,#366,#367,#368,#369,#370,#371,#372,#373,#374,#375,#376,#377,#378,#379,#380,#381,#382,#383,#384,#385,#386,#387,#388,#389,#390,#391,#392,#393,#394,#395,#396,#397,#398,#399,#400,#401,#402,#403,#404,#405,#406,#407,#408,#409,#410,#411,#412,#413,#414,#415,#416,#417,#418,#419,#420,#421,#422,#423,#424,#425,#426,#427,#428,#429,#430,#431,#432,#433,#434,#435,#436,#437,#438,#439,#440,#441,#442,#443,#444,#445,#446,#447,#448,#449,#450,#451,#452,#453,#454,#455,#456,#457,#458,#459,#460,#461,#462,#463,#464,#465,#466,#467,#468,#469,#470,#471,#472,#473,#474,#475,#476,#477,#478,#479,#480,#481,#482,#483,#484,#485,#486,#487,#488,#489,#490,#491,#492,#493,#494,#495,#496,#497,#498,#499,#500,#501,#502,#503,#504,#505,#506,#507,#508,#509,#510,#511,#512,#513,#514,#515,#516,#517,#518,#519,#520,#521,#522,#523,#524,#525,#526,#527,#528,#529,#530,#531,#532,#533,#534,#535,#536,#537,#538,#539,#540,#541,#542,#543,#544,#545,#546,#547,#548,#549,#550,#551,#552,#553,#554,#555,#556,#557,#558,#559,#560,#561,#562,#563,#564,#565,#566,#567,#568,#569,#570,#571,#572,#573,#574,#575,#576,#577,#578,#579,#580,#581,#582,#583,#584,#585,#586,#587,#588,#589,#590,#591,#592,#593,#594,#595,#596,#597,#598,#599,#600,#601,#602,#603,#604,#605,#606,#607,#608,#609,#610,#611,#612,#613,#614,#615,#616,#617,#618,#619,#620,#621,#622,#623,#624,#625,#626,#627,#628,#629,#630,#631,#632,#633,#634,#635,#636,#637,#638,#639,#640,#641,#642,#643,#644,#645,#646,#647,#648,#649,#650,#651,#652,#653,#654,#655,#656,#657,#658,#659,#660,#661,#662,#663,#664,#665,#666,#667,#668,#669,#670,#671,#672,#673,#674,#675,#676,#677,#678,#679,#680,#681,#682,#683,#684,#685,#686,#687,#688,#689,#690,#691,#692,#693,#694,#695,#696,#697,#698,#699,#700,#701,#702,#703,#704,#705,#706,#707,#708,#709,#710,#711,#712,#713,#714,#715,#716,#717,#718,#719,#720,#721,#722,#723,#724,#725,#726,#727,#728,#729,#730,#731,#732,#733,#734,#735,#736,#737,#738,#739,#740,#741,#742,#743,#744,#745,#746,#747,#748,#749,#750,#751,#752,#753,#754,#755,#756,#757,#758,#759,#760,#761,#762,#763,#764,#765,#766,#767,#768,#769,#770,#771,#772,#773,#774,#775,#776,#777,#778,#779,#780,#781,#782,#783,#784,#785,#786,#787,#788,#789,#790,#791,#792,#793,#794,#795,#796,#797,#798,#799,#800,#801,#802,#803,#804,#805,#806,#807,#808,#809,#810,#811,#812,#813,#814,#815,#816,#817,#818,#819,#820,#821,#822,#823,#824,#825,#826,#827,#828,#829,#830,#831,#832,#833,#834,#835,#836,#837,#838,#839,#840,#841,#842,#843,#844,#845,#846,#847,#848,#849,#850,#851,#852,#853,#854,#855,#856,#857,#858,#859,#860,#861,#862,#863,#864,#865,#866,#867,#868,#869,#870,#871,#872,#873,#874,#875,#876,#877,#878,#879,#880,#881,#882,#883,#884,#885,#886,#887,#888,#889,#890,#891,#892,#893,#894,#895,#896,#897,#898,#899,#900,#901,#902,#903,#904,#905,#906,#907,#908,#909,#910,#911,#912,#913,#914,#915,#916,#917,#918,#919,#920,#921,#922,#923,#924,#925,#926,#927,#928,#929,#930,#931,#932,#933,#934,#935,#936,#937,#938,#939,#940,#941,#942,#943,#944,#945,#946,#947,#948,#949,#950,#951,#952,#953,#954,#955,#956,#957,#958,#959,#960,#961,#962,#963,#964,#965,#966,#967,#968,#969,#970,#971,#972,#973,#974,#975,#976,#977,#978,#979,#980,#981,#982,#983,#984,#985,#986,#987,#988,#989,#990,#991,#992,#993,#994,#995,#996,#997,#998,#999,#1000,#1001,#1002,#1003,#1004,#1005,#1006,#1007,#1008,#1009,#1010,#1011,#1012,#1013,#1014,#1015,#1016,#1017,#1018,#1019,#1020,#1021,#1022,#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V4 announcement, v3 is obsolete now.

codybrouwers · 2017-08-21T05:03:30Z

In case anyone else comes across this error and the above doesn't work, I encountered it because I was passing the first argument from onSubmitEditing on a <TextInput> to a function like so:

<TextInput
  onSubmitEditing={(text) => this.performSearch(text)} // Should be event, not text
/>

That text variable is actually the submit event which is what ended up giving me the message above and a headache debugging for a while.

qianmenglin · 2018-04-23T08:37:11Z

event.preventDefault();
event.stopPropagation();

jay51 · 2018-08-27T22:21:44Z

I think the problem is, you're trying to access the event object after it's released and redefined.

React Docs => The SyntheticEvent is pooled. This means that the SyntheticEvent object will be reused and all properties will be nullified after the event callback has been invoked. This is for performance reasons. As such, you cannot access the event in an asynchronous way.

if you need to use an attribute from the event obj then you would have to access it like this

function displayForm(event){
    console.log(event) // will error
    console.log(event.type) will work
    const eventType = evnet.type; 
   // or call event.persist();

If you want to access the event properties in an asynchronous way, you should call event.persist() on the event, which will remove the synthetic event from the pool and allow references to the event to be retained by user code.

demoran23 · 2018-12-06T13:19:05Z

I'm not sure if the cause of this issue has been clearly explained, so please allow me to share my understanding and how I fixed it.

TouchableWithoutFeedback defines onPress?: (event: GestureResponderEvent) => void;.

Thus, when providing simply the function name, the parameter that is passed in is a GestureResponderEvent - and there's a good chance that isn't what you expect.

By changing from the function name to an anonymous function that invokes your function (eg () => yourFunction()), the GestureResponderEvent is not passed through to your function.

FSBalbuena · 2019-12-06T23:33:40Z

Guys i had this problem on a navigator.

Screen.navigationOptions=({navigation})=>{
const handleEditButton=navigation.navigate.bind(this,"EditProduct")
return {
    headerTitle:"My Products",
    headerRight:<CustomHeaderButton 
    iconName="ios-add"
    title="Add"
    iconSize={26}
    color={colors.bright}
    onPress={handleEditButton}
    />
}
}

pay attention to the method i used . I was trying to bind the navigate method. (Yeah, i know)

const handleAddButton=()=>navigation.navigate("EditProduct")

jamielob mentioned this issue Nov 24, 2016

Why doesn't Modal dispatch ActionConst.FOCUS? #1373

Closed

aksonov closed this as completed in 97e89ae Jul 8, 2017

madandrija mentioned this issue Nov 6, 2018

mapStateToProps() not being called reduxjs/redux#1726

Closed

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Receiving "synthetic event is reused" warning when navigating between scenes using redux sample code #1328

Receiving "synthetic event is reused" warning when navigating between scenes using redux sample code #1328

joeferraro commented Oct 27, 2016

jamielob commented Nov 10, 2016

Almouro commented Nov 16, 2016

jamielob commented Nov 24, 2016

Almouro commented Nov 24, 2016

gustavjf commented Jan 30, 2017

EliCDavis commented Jun 14, 2017

codybrouwers commented Aug 21, 2017

qianmenglin commented Apr 23, 2018

jay51 commented Aug 27, 2018 •

edited

demoran23 commented Dec 6, 2018

FSBalbuena commented Dec 6, 2019

Receiving "synthetic event is reused" warning when navigating between scenes using redux sample code #1328

Receiving "synthetic event is reused" warning when navigating between scenes using redux sample code #1328

Comments

joeferraro commented Oct 27, 2016

Version

Expected behaviour

Actual behaviour

Steps to reproduce

jamielob commented Nov 10, 2016

Almouro commented Nov 16, 2016

jamielob commented Nov 24, 2016

Almouro commented Nov 24, 2016

gustavjf commented Jan 30, 2017

EliCDavis commented Jun 14, 2017

codybrouwers commented Aug 21, 2017

qianmenglin commented Apr 23, 2018

jay51 commented Aug 27, 2018 • edited

demoran23 commented Dec 6, 2018

FSBalbuena commented Dec 6, 2019

jay51 commented Aug 27, 2018 •

edited