## javascript – How can I fix this error?[Vue warn]: Error in Rendering: "TypeError: Can not Read Property" Corresponding "Not Defined"

I start with Views js and I am a tutorial, but I get the corresponding error in the title, I do not know what to do, I will leave my code here, I hope and they will be able to me. help, I've investigated, it may be the road but I can not find the detail. could be the links but check them all and I do not think it's there, try also to change the routes to see if it was there but not, I really did not see the tutorial in udemy like 8 times thanks in advance.

``````

View Priemros Steps

Home
Lists

``````

That's my list

``````const Lists = {
name: "Lists",
model:
```````

{{nobody}}

</ div`,
data: function () {
return {
people: ["andres","gustavo", "juan","aleja"]
}
}
}
``````

This is my application js

``````const router = new VueRouter ({
routes: [
{
path:'/List',
components: 'Lists'
}
]
})

var app = new View ({
the: # app #,
router
});
``````

## Complexity Theory – Can a function that produces a set of edges with a specific "aggregate graph property" be multitasking?

Let $$G (V, E)$$ to be a graph.
Let $$S$$ either all of the combinations of $$| V |$$ edges.
Let $$A$$ And $$B$$ to be two subsets of $$S$$, or:

• each subset is a collection of all the elements of $$S$$ who share a common "global property"
• the overall properties of $$A$$ And $$B$$ are different
• $$| A | gt 0$$
• $$| B | gt 0$$
• $$| A cap B | geq 0$$
• $$A not subseteq B$$
• $$B not subseteq A$$

DEFINITION: Aggregate Property, $$P$$of $$Q in S$$
Given some $$Q in S$$, we must examine each element of $$Q$$ in order to check the property $$P$$.

• Example for $$Q in A$$:[sommedesarêtesdans[sumofedgesin[sommedesarêtesdans[sumofedgesin$$Q$$] $$leq 40$$
• Example for $$Q B$$:[bordsdans[edgesin[bordsdans[edgesin$$Q$$ Hamiltonian Cycle form in $$G$$]

Let $$alpha$$ to be an algorithm that returns an element $$A$$given $$G$$.
Let $$beta$$ to be an algorithm that returns an element $$B$$given $$G$$.

Each point represents an edge of the graph $$G$$:

As a reminder, the global properties of A and B are not the same, therefore:

Key idea 1: Any algorithm that starts at level 1 and ends at level 2 and produces a set of edges with a unique relationship, A, must be an algorithm for α and NOT β.

Let $$gamma$$ or any algorithm that returns a set of edges having both the properties A and B, and which does not provide one before the other (does not go to level 3, as described below).
By definition, $$gamma$$ is an algorithm for $$alpha$$.
By definition, $$gamma$$ is an algorithm for $$beta$$.
So $$alpha$$ and $$beta$$ can be equal.
Since $$alpha$$ and $$beta$$ can be equal, A and B are no longer distinct, because they can be insured using the same algorithm, $$gamma$$.
So, A and B are actually the same property.

Key idea 2If an algorithm, γ, which starts at level 1 and ends at level 2, produces a set of edges with 2 relations, M and N, then M and N must be identical.

In order to guarantee 2 distinct properties, $$gamma$$ must go to a 3rd level:

So now, $$gamma$$ has 2 options:

• Carry out $$alpha$$then run $$beta$$ (worst case = $$| A |$$, must search for the output of $$alpha$$ who has $$B$$-Property)
• Carry out $$beta$$then run $$alpha$$ (worst case = $$| B |$$, must search for the output of $$beta$$ who has $$A$$-Property)

Given the context above, is the time complexity of any algorithm $$gamma$$ (the one that produces a set of edges at the intersection of $$A$$ and $$B$$, so this product set will have 2 aggregate properties) delimited by the top $$| A |$$ or $$| B |$$?

If so, and we demonstrate a $$A$$ and $$B$$ with exponential sizes compared to the input graph, could we use this technique to show that $$gamma$$ Should it take an exponential time in the worst case?

This model does not apply to k-SAT because a solution to k-SAT must have only one aggregate property:

• truth values ​​make a true proposition

Whereas a solution for TSP must have 2 aggregate properties:

• sum of edges $$leq L$$
• the edges form the Hamiltonian cycle in $$G$$

## javascript – What's the meaning "Typeerror can not read the property" 0 "undefined"?

``````var previousDataRange = ss2.getRange (5,1, lastRow, 8);

previousDataRange.clear ();

var data = ss.getRange (3.1, lastRow-1.8) .getValues ​​();

var currentRow = ss2.getLastRow () + 1;

for (var a = 0; a <= data.length; a ++) {

for (var b = 0; b <= 7; b ++) {// 8 columns

var cellValue = data[a][b]; // I have the error "typeerror can not read the property" 0 undefined "here

ss2.getRange (currentRow, b + 1) .setValue (cellValue);
}
currentRow = currentRow + 1;
}
``````

## javascript – Node.js: "TypeError: Can not read property" get "from undefined"

I have 3 errors, or more, I do not know, here they are (I'm going to put the code that makes the mistake):

TypeError: Unable to read property 'get & # 39; undefined

``````				let data = ops.active.get (message.guild.id) || {};

if (! data.connection) data.connection = wait message.member.voiceChannel.join ()
if (! data.queue) data.queue = [];
data.guildID = message.guild.id;``````

UnhandledPromiseRejectionWarning: Rejection of an unmanaged promise. This error is due either to the launch of an asynchronous function without a catch block, or to the rejection of a promise that has not been handled with .catch (). (ID of rejection: 1)

(node: 10648) [DEP0018] DeprecationWarning: unmanaged promises are obsolete. In the future, discards of unmanaged promises will terminate the Node.js process with a non-zero exit code.

(The last 2 do not have an exact code, here is my complete code:

``````const ytdl = require (& # 39; ytdl-core & # 39;);
const streamOptions = {search: 0, volume: 1};

exports.run = async (client, message, arguments, ops) => {

if (! message.member.voiceChannel) returns message.channel.send (& # 39; Please connect to a voice channel to read tutorials on how to earn more from PeterGriffinCoins! & # 39;);

// if (message.guild.me.voiceChannel) returns message.channel.send (Sorry, I am already logged in to this guild.);

if (! args[0]) return message.channel.send (Sorry, please enter the URL of the video so that I can steal it and put it on voice chat.);

let validate = wait ytdl.validateURL (args[0])

if (! validate) return message.channel.send (Sorry, please enter a valid ** URL ** after the order. & # 39;);

leave info = wait ytdl.getInfo (args[0])

let data = ops.active.get (message.guild.id) || {};

if (! data.connection) data.connection = wait message.member.voiceChannel.join ()
if (! data.queue) data.queue = [];
data.guildID = message.guild.id;

data.queue.push ({
songTitle: info.title,
requestor: message.author.tag,
url: args[0],
});

if (! data.dispatcher) playstream (client, ops, data);
other {

message.channel.send (`Added to queue: \$ {info.title} | Requested by: \$ {message.author.id}`);

}

ops.active.set (message.guild.id, data);

}

asynchronous function playstream (client, ops, data) {

client.channels.get (data.queue[0].announceChannel) .send (`Currently playing: \$ {data.queue[0].songTitle} | Required by: \$ {data.queue[0].requester} `);

data.dispatcher = wait data.connection.playstream (ytdl (data.queue[0].url, {filter: uniquement only}));
data.dispatcher.guildID = data.guildID;

data.dispatcher.once (& # 39; finish & # 39; function () {

finish (client, ops, this);
});
}
finish function (client, ops, dispatcher) {

let fetched = ops.active.get (dispatcher.guildID);

fetched.queue.shift ();

if (fetched.queue.length> 0) {

ops.active.set (dispatcher.guildID, retrieved);

playstream (client, ops, recovered);
} other {

ops.active.delete (dispatcher.guildID);

let vc = client.get (dispatcher.guildID) .me.voiceChannel;
if (vc) vc.leave ();
}

}``````

## html – Error "Attempt to get the property" fetch_row "from non-object in C: xampp htdocs connection connection3.php to line 28"

good night.
I study design and they let me plan a PHP database. The problem is that I get a "Notice: try to get the property" fetch_row "from non-object in C: xampp htdocs conexion conexion3.php online 28 "when I open it in the browser. This refers to the line "\$ rows = \$ result-> fetch_row;"
I do not know how to solve it because, depending on the format used, I changed only the information in the database.
The complete code is as follows:

connect_error) {
die ("Error in connection". \$ myconexion-> connect_error);
}
if not {
echo "The connection has been established successfully …". \$ myconexion-> host_info. "

";
}

?>

Connection example 2

NameOfficial number

query ("select name, nempleado from auto_veloz");

\$ rows = \$ result-> fetch_row;
if (\$ rows> = 1) {

while (\$ row = \$ result-> fetch_assoc ()) {
?>

``````

``````
``````
``````

to close ();

?>

## javascript – I continue to encounter an error "Unable to read property" innerHTML "of undefined"

I am a novice in game design and I have to create a game for my project but I still have a mistake to make with:

index.html: 93 Uncaught TypeError: Unable to read property 'innerHTML & # 39; of undefined

at drawMissiles (index.html: 93)

on gameLoop (index.html: 140)

An idea of ​​how to solve this problem?

``````                drawMissiles ()
}

drawMissiles function () {
document.getElementsByTagName (missile & # 39;)[0].innerHTML <--- (index.html: 93)
for (var i = 0; i <missiles.length; i ++) {
document.getElementById ("missile"). innerHTML + =
``;
``````

## javascript – Leaflet Draw "Unable to read property" enable "undefined" by adding control to geoJSON layer

I'm trying to use the flyer editing feature on the polygons I've loaded from my database. When I click on the flyer modification button, the error message appears.
`Could not read property & # 39; enable & # 39; of indefinite`

This thread describes a similar problem, and the user ddproxy said

"Since FeatureGroup extends LayerGroup You can browse layers
presented and add them individually to the FeatureGroup used to
Leaflet.draw "

I do not understand what it means to "cross", I thought to add a layer group, so I'm not sure what I would do. Does this have to do with the fact that I'm adding the polygons as a geoJSON object?
Adding polygons to the map, linking their pop-up windows and assigning them custom colors works perfectly.

The following is the relevant code:

``````
//other stuff

});

//next 6 lines siply add map to page
var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'
var osm = L.tileLayer(osmUrl, { maxZoom: 18, attribution: osmAttrib})
var map = new L.Map('map', { center: new L.LatLng(39.255467, -76.711964), zoom: 16 })

L.control.layers({
},
{
'drawlayer': drawnItems,
"Hazards" : Hazards,
"Tickets": Tickets
},

{
position: 'topleft', collapsed: false
}

edit: {
featureGroup: Hazards,
poly: {
allowIntersection: false
}
},
draw: {
polygon: {
allowIntersection: false,
showArea: true
},
rectangle:false,
circle:false,
circlemarker:false
}
}));

map.on(L.Draw.Event.CREATED, function (event) {
var layer = event.layer;
});

``````

``````function loadHazards () {
\$ .ajax ({
type: "GET",
url: & # 39; / loadPolygonFromDatabase & # 39;
success: function (polygons) {
polygons = JSON.parse (polygons);

for (i in polygons) {

var item = {
"type": "Feature",
"Properties": {
"Category":"",
"the description":"",
"ID": ""
}
"geometry": {
"type": "polygon",
"contact information":[],

}

};

article["geometry"]["coordinates"][0]    = polygons[i]["coordinates"];
article["properties"]["category"]                    = polygons[i]["category"];
article["properties"]["description"]        = polygons[i]["description"];
article["properties"]["ID"]        = polygons[i]["ID"];

}

// Add information to a popup
var layerGroup = L.geoJSON (toAdd, {
onEachFeature: function (feature, layer) {
layer.bindPopup (& # 39;& # 39; + feature.properties.category + & # 39;& # 39;
+ & # 39;& # 39; + feature.properties.description + & # 39;& # 39;);
layer.id = feature.properties.ID;

}
style: function (functionality) {
switch (feature.properties.category) {
case & # 39; Rabid_Beavers & # 39 ;: return {color: "# 663326"};
Fire box: return {color: "# ff0000"};
box "Flood": return {color: "# 0000ff"};
}
}