every one!
I use tablpanel in extjs4,found the memory in IE8 didn't reduce when remove the panel in tabpanel,and also raised when add the panel again.so I write a test as below:
Ext.onReady(function() {
var currentItem;
var tabs = Ext.createWidget('tabpanel', {
renderTo: 'tabs',
resizeTabs: true,
enableTabScroll: true,
width: 600,
height: 250,
defaults: {
autoScroll:true,
bodyPadding: 10
}
});
var __my_task = '';
var i = 0;
try{
__my_task = {
run: function(){
if (i % 2 == 0){
for(var j = 0; j < 10; j++){
addTab(true);
}
}else{
var items = [];
tabs.items.each(function(item){
if(item.closable){
if(!false || item != this.item){
items.push(item);
}
}
}, this);
Ext.each(items, function(item){
tabs.remove(item);
item.destroy();
}, this);
} // else
i ++;
},
interval: 300
}
Ext.TaskManager.start(__my_task);
}catch(e){}
// tab generation code
var index = 0;
function addTab (closable) {
++index;
tabs.add(Ext.create('Ext.tree.Panel',{
title: 'New Tab ' + index,
iconCls: 'tabs',
closable: !!closable
}));
}
});
run it in IE8,the memory will raised so quickly,my code is wrong ? any question for me, thanks!
IMO it's hardly to evaluate if there is memory leak in Javascript (Extjs written in JS as you know). The object may be deleted with delete() (destroy() will use it) but cannot sure when the memory will be actually released.
You can find more about Javascript garbage collector in Deleting or setting to null and Javascript garbage collection
Related
I've created a plnkr to auto-group row-spans the way you would really expect it to work out of the box IMHO.
Anyhow... doing this surfaces an apparent bug... the rowSpan is not consistently applied to the grid.. if you scroll up and down, it sometimes applies, and sometimes does not.
In the screenshot below... you can see 'Aaron Peirsol' is spanning... but if I scroll up and down it might not span on him... not consistent.
Here 'Aaron Peirsol' is no longer spanning all 3 rows -- all I did was scroll up and back down
See this Sample
https://plnkr.co/edit/UxOcCL1SEY4tScn2?open=app%2Fapp.component.ts
Here I've added columndefs for the grouping
{
field: 'athlete',
rowSpan: params => params.data.groupCount,
cellClassRules: {
'cell-span': "data.isFirst && data.groupCount>1",
},
width: 200,
},
{field:'groupCount', width: 20}, /* included for debugging */
{field:'isFirst', width: 20}, /* included for debugging */
And here I'm doing the auto-grouping code:
onGridReady(params: GridReadyEvent) {
this.http
.get<any[]>('https://www.ag-grid.com/example-assets/olympic-winners.json')
.subscribe((data) => {
let groupKey = 'athlete';
let sorted = data.sort((a,b) => (a[groupKey] > b[groupKey]) ? 1 :
((b[groupKey] > a[groupKey]) ? -1 : 0));
let filtered = sorted.filter(x => {
return x[groupKey] < 'Albert' && x[groupKey];
});
var groupBy = function(xs, key) {
return xs.reduce(function(rv, x) {
let keyValue = x[key];
if (rv[keyValue] === undefined)
{
rv[keyValue] = 0;
}
if (keyValue) {
rv[keyValue] ++;
}
return rv;
}, {});
};
let grouped = groupBy(filtered, groupKey);
let prev = '';
for (let i=0; i<filtered.length; i++)
{
let keyValue = filtered[i][groupKey];
filtered[i]['groupCount'] = grouped[keyValue];
if (keyValue == prev)
{
filtered[i]['isFirst'] = false;
}
else
{
filtered[i]['isFirst'] = true;
}
prev = keyValue;
}
this.rowData = filtered});
}
OK, found the issue...
rowSpan function must only return a span count for the first row of the span...
every other row it must return 1
I've updated the plunker
public columnDefs: ColDef[] = [
{
field: 'athlete',
rowSpan: params => params.data.groupRowCount == 1 ? params.data.groupCount: 1, //THIS IS CRUCIAL.. only return count for first row
cellClassRules: {
'cell-span': "data.groupRowCount==1 && data.groupCount>1",
},
width: 200,
},
I'm writing Webrtc chrome desktop app by accessing 2 camera simultaneously using latest Chrome Windows version.
Accessing camera list by navigator.mediaDevices.enumerateDevices() is ok but accessing these device by their specific id using navigator.mediaDevices.getUserMedia not work.
It only occurs sometimes. But no error in the catch.
So, I tried navigator.mediaDevices.getUserMedia is really exists or not.
if (navigator && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
}
Yes, it was.
Just not getting any log info in calling navigator.mediaDevices.getUserMedia()
getVideoSources_ = function() {
return new Promise(function(resolve, reject) {
if (typeof navigator.mediaDevices.enumerateDevices === 'undefined') {
alert('Your browser does not support navigator.mediaDevices.enumerateDevices, aborting.');
reject(Error("Your browser does not support navigator.mediaDevices.enumerateDevices, aborting."));
return;
}
requestVideoSetTimeout = 500;
navigator.mediaDevices.enumerateDevices().then((devices) => {
// get the list first by sorting mibunsho camera in first place
for (var i = 0; i < devices.length; i++) {
log("devices[i]", JSON.stringify(devices[i]));
log("devices[i].label", devices[i].label);
if (devices[i].kind === 'videoinput' && devices[i].deviceId && devices[i].label) {
if (devices[i].label.indexOf("USB_Camera") > -1) {
deviceList[1] = devices[i];
} else {
deviceList[0] = devices[i];
}
}
}
// request video by sorted plan
for (var i = 0; i < deviceList.length; i++) {
requestVideo_(deviceList[i].deviceId, deviceList[i].label, resolve, reject);
requestVideoSetTimeout = 1000; // change requestVideoSetTimeout for next video request
}
}).catch((err) => {
log("getVideoSources_:" + err.name + ": " + err.message);
reject(Error("getVideoSources_ catch error"));
});
});
}
getVideoSources_().then(function(result) {
....
}).catch(function(err) {
....
});
function requestVideo_(id, label, resolve, reject) {
if (navigator && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
log("navigator.mediaDevices.getUserMedia found!");
navigator.mediaDevices.getUserMedia({
video: {
deviceId: {exact: id},
width: 640,
height: 480,
frameRate: {
ideal: 20,
max: 20
}
},
audio: false}).then(
(stream) => {
log("***requestVideo_", id);
log("***requestVideo_", label);
log("***requestVideo_", stream);
// USB_Camera is face camera
if (label.indexOf("USB_Camera") > -1) {
log("***requestVideo_001");
myStream2 = stream;
log("***requestVideo_myStream2", myStream2);
} else {
log("***requestVideo_002");
myStream = stream;
log("***requestVideo_myStream", myStream);
getUserMediaOkCallback_(myStream, label);
}
resolve("###Video Stream got###");
stream.getVideoTracks()[0].addEventListener('ended', function(){
log("***Camera ended event fired. " + id + " " + label);
endedDevice[id] = label;
});
},
getUserMediaFailedCallback_
).catch((error) => {
log('requestVideo_: ' + error.name);
reject(Error("requestVideo_ catch error" + error.name));
});
}
}
function getUserMediaFailedCallback_(error) {
log("getUserMediaFailedCallback_ error:", error.name);
alert('User media request denied with error: ' + error.name);
}
#Kaiido is right, resolve is called in a for-loop here, which is all over the place, and before all the code has finished. Any error after this point is basically lost.
This is the promise constructor anti-pattern. In short: Don't write app code inside promise constructors. Don't pass resolve and reject functions down. Instead, let functions return promises up to you, and add all app code in then callbacks on them. Then return all promises so they form a single chain. Only then do errors propagate correctly.
See Using promises on MDN for more.
i'm trying re-organised a list of data. I have given each li a unique key, but still, no luck!
I have had this working before exactly like below, think i'm cracking up!
let app = new Vue({
el: '#app',
data: {
list: [
{ value: 'item 1', id: '43234r' },
{ value: 'item 2', id: '32rsdf' },
{ value: 'item 3', id: 'fdsfsdf' },
{ value: 'item 4', id: 'sdfg543' }
]
},
methods: {
randomise: function() {
let input = this.list;
for (let i = input.length-1; i >=0; i--) {
let randomIndex = Math.floor(Math.random()*(i+1));
let itemAtIndex = input[randomIndex];
input[randomIndex] = input[i];
input[i] = itemAtIndex;
}
this.list = input;
}
}
});
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<div id="app">
<ul>
<li v-for="item in list" :key="item.id">{{ item.value }}</li>
</ul>
Randomize
</div>
Edit:
Thanks for the answers, to be honest the example I provided may not have been the best for my actual issue I was trying to solve. I think I may have found the cause of my issue.
I'm basically using a similar logic as above, except i'm moving an array of objects around based on drag and drop, this works fine with normal HTML.
However, i'm using my drag and drop component somewhere else, which contains ANOTHER component and this is where things seem to fall apart...
Would having a component within another component stop Vue from re-rendering when an item is moved within it's data?
Below is my DraggableBase component, which I extend from:
<script>
export default {
data: function() {
return {
dragStartClass: 'drag-start',
dragEnterClass: 'drag-enter',
activeIndex: null
}
},
methods: {
setClass: function(dragStatus) {
switch (dragStatus) {
case 0:
return null;
case 1:
return this.dragStartClass;
case 2:
return this.dragEnterClass;
case 3:
return this.dragStartClass + ' ' + this.dragEnterClass;
}
},
onDragStart: function(event, index) {
event.stopPropagation();
this.activeIndex = index;
this.data.data[index].dragCurrent = true;
this.data.data[index].dragStatus = 3;
},
onDragLeave: function(event, index) {
this.data.data[index].counter--;
if (this.data.data[index].counter !== 0) return;
if (this.data.data[index].dragStatus === 3) {
this.data.data[index].dragStatus = 1;
return;
}
this.data.data[index].dragStatus = 0;
},
onDragEnter: function(event, index) {
this.data.data[index].counter++;
if (this.data.data[index].dragCurrent) {
this.data.data[index].dragStatus = 3;
return;
}
this.data.data[index].dragStatus = 2;
},
onDragOver: function(event, index) {
if (event.preventDefault) {
event.preventDefault();
}
event.dataTransfer.dropEffect = 'move';
return false;
},
onDragEnd: function(event, index) {
this.data.data[index].dragStatus = 0;
this.data.data[index].dragCurrent = false;
},
onDrop: function(event, index) {
if (event.stopPropagation) {
event.stopPropagation();
}
if (this.activeIndex !== index) {
this.data.data = this.array_move(this.data.data, this.activeIndex, index);
}
for (let index in this.data.data) {
if (!this.data.data.hasOwnProperty(index)) continue;
this.data.data[index].dragStatus = 0;
this.data.data[index].counter = 0;
this.data.data[index].dragCurrent = false;
}
return false;
},
array_move: function(arr, old_index, new_index) {
if (new_index >= arr.length) {
let k = new_index - arr.length + 1;
while (k--) {
arr.push(undefined);
}
}
arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
return arr; // for testing
}
}
}
</script>
Edit 2
Figured it out! Using the loop index worked fine before, however this doesn't appear to be the case this time!
I changed the v-bind:key to use the database ID and this solved the issue!
There are some Caveats with arrays
Due to limitations in JavaScript, Vue cannot detect the following changes to an array:
When you directly set an item with the index, e.g. vm.items[indexOfItem] = newValue
When you modify the length of the array, e.g. vm.items.length = newLength
To overcome caveat 1, both of the following will accomplish the same as vm.items[indexOfItem] = newValue, but will also trigger state updates in the reactivity system:
Vue.set(vm.items, indexOfItem, newValue)
Or in your case
randomise: function() {
let input = this.list;
for (let i = input.length-1; i >=0; i--) {
let randomIndex = Math.floor(Math.random()*(i+1));
let itemAtIndex = input[randomIndex];
Vue.set(input, randomIndex, input[i]);
Vue.set(input, i, itemAtIndex);
}
this.list = input;
}
Here is an working example: Randomize items fiddle
Basically I changed the logic of your randomize function to this:
randomize() {
let new_list = []
const old_list = [...this.list] //we don't need to copy, but just to be sure for any future update
while (new_list.length < 4) {
const new_item = old_list[this.get_random_number()]
const exists = new_list.findIndex(item => item.id === new_item.id)
if (!~exists) { //if the new item does not exists in the new randomize list add it
new_list.push(new_item)
}
}
this.list = new_list //update the old list with the new one
},
get_random_number() { //returns a random number from 0 to 3
return Math.floor(Math.random() * 4)
}
randomise: function() { let input = this.list;
for (let i = input.length-1; i >=0; i--) {
let randomIndex = Math.floor(Math.random()*(i+1));
let itemAtIndex = this.list[randomIndex];
Vue.set(this.list,randomIndex,this.list[i])
this.list[randomIndex] = this.list[i];
this.list[i] = itemAtIndex;
} this.list = input;
}
Array change detection is a bit tricky in Vue. Most of the in place
array methods are working as expected (i.e. doing a splice in your
$data.names array would work), but assigining values directly (i.e.
$data.names[0] = 'Joe') would not update the reactively rendered
components. Depending on how you process the server side results you
might need to think about these options described in the in vue
documentation: Array Change Detection.
Some ideas to explore:
using the v-bind:key="some_id" to have better using the push to add
new elements using Vue.set(example1.items, indexOfItem, newValue)
(also mentioned by Artokun)
Source
Note that it works but im busy so i cant optimize it, but its a little bit too complicted, i Edit it further tomorrow.
Since Vue.js has some caveats detecting array modification as other answers to this question highlight, you can just make a shallow copy of array before randomazing it:
randomise: function() {
// make shallow copy
let input = this.list.map(function(item) {
return item;
});
for (let i = input.length-1; i >=0; i--) {
let randomIndex = Math.floor(Math.random()*(i+1));
let itemAtIndex = input[randomIndex];
input[randomIndex] = input[i];
input[i] = itemAtIndex;
}
this.list = input;
}
The jsfiddle (https://jsfiddle.net/kalyansai99/mm1b74uy/22/) contains code where the user can toggle between front and back camera of the mobile.
In few mobiles its working fine (Moto g5 plus, Moto E3 and so on - Chrome Browser) and in few mobiles (Mi Redimi Note 4 - Chrome Browser) when I am switching to back camera, initially the stream is loading with a track of "readyState" as "live". But when i am about to play the stream in video player, the "readyState" is getting changed to "ended" and black screen is been shown on the video tag.
Not sure whats happening. Any clues?
JSFiddle Code
var player = document.getElementById('player');
var flipBtn = document.getElementById('flipBtn');
var deviceIdMap = {};
var front;
var constraints = {
audio: false,
video: {
frameRate: 1000
}
};
var gotDevices = function (deviceList) {
var length = deviceList.length;
console.log(deviceList);
for (var i = 0; i < length; i++) {
var deviceInfo = deviceList[i];
if (deviceInfo.kind === 'videoinput') {
if (deviceInfo.label.indexOf('front') !== -1) {
deviceIdMap.front = deviceInfo.deviceId;
} else if (deviceInfo.label.indexOf('back') !== -1) {
deviceIdMap.back = deviceInfo.deviceId;
}
}
}
if (deviceIdMap.front) {
constraints.video.deviceId = {exact: deviceIdMap.front};
front = true;
} else if (deviceIdMap.back) {
constraints.video.deviceId = {exact: deviceIdMap.back};
front = false;
}
console.log('deviceIdMap - ', deviceIdMap);
};
var handleError = function (error) {
console.log('navigator.getUserMedia error: ', error);
};
function handleSuccess(stream) {
window.stream = stream;
// this is a video track as there is no audio track
console.log("Track - ", window.stream.getTracks()[0]);
console.log('Ready State - ', window.stream.getTracks()[0].readyState);
if (window.URL) {
player.src = window.URL.createObjectURL(stream);
} else {
player.src = stream;
}
player.onloadedmetadata = function (e) {
console.log('Ready State - 3', window.stream.getTracks()[0].readyState);
player.play();
console.log('Ready State - 4', window.stream.getTracks()[0].readyState);
}
console.log('Ready State - 2', window.stream.getTracks()[0].readyState);
}
navigator.mediaDevices.enumerateDevices().then(gotDevices).catch(handleError);
flipBtn.addEventListener('click', function () {
if (window.stream) {
window.stream.getTracks().forEach(function(track) {
track.stop();
});
}
if (front) {
constraints.video.deviceId = {exact: deviceIdMap.back};
} else {
constraints.video.deviceId = {exact: deviceIdMap.front};
}
front = !front;
navigator.getUserMedia(constraints, handleSuccess, handleError);
}, false);
console.log(constraints);
navigator.getUserMedia(constraints, handleSuccess, handleError);
#player {
width: 320px;
}
#flipBtn {
width: 150px;
height: 50px;
}
<video id="player" autoplay></video>
<div>
<button id="flipBtn">
Flip Camera
</button>
</div>
Replace track.stop() to track.enabled=false and when adding track to the stream, enable it back using track.enabled=true
The MediaStream.readyState property is changed to "ended" when we stop the track and can never be used again. Therefore its not wise to use stop. For more reference:
https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack/readyState
https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack/stop
m using sencha touch 2 and using local storage in it,
but the data is getting flushed of as soon as i refresh the page, can u please tell me whats wrong, here is the code for my store and insert delete function
Ext.define("OfferDrive.store.CategoryStore", {
extend: "Ext.data.Store",
requires: "Ext.data.proxy.LocalStorage",
config: {
model: "OfferDrive.model.StoreCategories",
proxy: {
type: 'localstorage',
id: 'favorite-category-store'
}
}
});
here is the code from a view that adds or inserts the record in it
var favCategoriesStore = Ext.getStore('CategoryStore');
for (var i=0; i< categoryList.config.store.data.items.length; i++)
{
if(categoryList.config.store.data.items[i].data.CheckUrl.indexOf("Golden") != -1){
var record = favCategoriesStore.findRecord('Id', categoryList.config.store.data.items[i].data.Id)
if (null == record){
//insert
var newFavorite = Ext.create("OfferDrive.model.StoreCategories", {
Id: categoryList.config.store.data.items[i].data.Id,
Name: categoryList.config.store.data.items[i].data.Name
});
favCategoriesStore.add(newFavorite);
}
}else{
var record = favCategoriesStore.findRecord('Id', categoryList.config.store.data.items[i].data.Id)
if (null != record){
//remove
favCategoriesStore.remove(record);
}
}
}
favCategoriesStore.sync();