Error:i is not defined.
Unable to retrieve the values by using for loop in the testcafe throwing error as 'i' is not defined.
this.totalaab= Selector(()=>document.querySelectorAll('aab-product-tile'));
async verifyvale() {
const accountcount = await this.totalaab.count;
console.log(accountcount)
for (let i = 0; i < accountcount; i++) {
console.log(i);
console.log(await Selector(() => document.querySelectorAll('aab-product-tile')));
let overviewvalue = Selector(() => document.querySelectorAll('aab-product-tile')[i].shadowRoot.querySelector('.m-0.overflow-ellipsis.title-label.text-truncate.text-green.font-weight-500'));
console.log(await overviewvalue.innerText);
//await t.expect(await overviewvalue(i).exists).ok();
}
}
It's not recommended to use the i variable inside the Selector function. If you want to query an element by its index, you can use the nth method as described at Selector.nth Method.
Related
const [Datalist,setDatalist] = useState([]);
useEffect(() => {
axios.get( 'http://0.0.0.0:8000/api/v1/questions/history/1')
.then(response => {
const questions = response.data;
const datalist = [];
for (let i = 0; i < questions.length - 1; i++) {
const data = new Object();
data.isExpanded = false;
data.question_id = questions[i].id;
data.question = questions[i].content;
data.type = questions[i].type;
data.commentType = questions[i].comment_type;
data.answer = [];
datalist.push(data);
}
setDatalist(datalist);
});
},[]);
I have three questions in my database currently. The for loop should be iterating through 0 to 2, however, it is only iterating twice.
And I'm also having problems putting the data into Datalist.
Anybody know where the issue is??
Thanks in advance!!
Change your for loop to this:
for (let i = 0; i < questions.length; i++)
Since you are iterating over each question you receive, you could use the map-method (if your environment supports ES6-Syntax - but since you're using react, it most likely dooes).
From the MDN Docs:
The map() method creates a new array populated with the results of calling a provided function on every element in the calling array.
With map, your code could look like this:
(Also note the removal of const data = new Object();. you can initialize an object and assign its properties/values at the same time)
const [Datalist,setDatalist] = useState([]);
useEffect(() => {
axios.get( 'http://0.0.0.0:8000/api/v1/questions/history/1')
.then(response => {
const questions = response.data;
const datalist = questions.map(question => {
return {
isExpanded: false;
question_id: question.id;
question: question.content;
type: question.type;
commentType: question.comment_type;
answer: [];
};
});
setDatalist(datalist);
});
},[]);
I'm trying to get information (true/false) from AsyncStorage in a function and create a string which is importent to fetch data in the next step. My problem is, the function is not finished until the string is required.
I tried many solutions from the internet like async function and await getItem or .done() or .then(), but none worked out for me.
//_getFetchData()
AsyncStorage.getAllKeys().then((result) => { //get all stored Keys
valuelength = result.length;
if (valuelength !== 0) {
for (let i = 0; i < valuelength; i++) {
if (result[i].includes("not") == false) { //get Keys without not
AsyncStorage.getItem(result[i]).then((resultvalue) => {
if (resultvalue === 'true') {
if (this.state.firstValue) {
this.state.channels = this.state.channels + "channel_id" + result[i];
console.log("channel: " + this.state.channels);
}
else {
this.state.channels = this.state.channels + "channel" + result[i];
}
}
});
}
return this.state.channels;
_fetchData() {
var channel = this._getFetchData();
console.log("channel required: " + channel);
}
The current behaviour is that the console displays first "channel required: " than "channel: channel_id0".
Aspects in your question are unclear:
You don't say when this.state.firstValue is set, and how that relates to what you are trying to accomplish.
You have a for-loop where you could be setting the same value multiple times.
You mutate the state rather than set it. This is not good, see this SO question for more on that.
There are somethings we can do to make your code easier to understand. Below I will show a possible refactor. Explaining what I am doing at each step. I am using async/await because it can lead to much tidier and easier to read code, rather than using promises where you can get lost in callbacks.
Get all the keys from AsyncStorage
Make sure that there is a value for all the keys.
Filter the keys so that we only include the ones that do not contain the string 'not'.
Use a Promise.all, this part is important as it basically gets all the values for each of the keys that we just found and puts them into an array called items
Each object in the items array has a key and a value property.
We then filter the items so that only the ones with a item.value === 'true' remain.
We then filter the items so that only the ones with a item.value !== 'true' remain. (this may be optional it is really dependent on what you want to do)
What do we return? You need to add that part.
Here is the refactor:
_getFetchData = async () => {
let allKeys = await AsyncStorage.getAllKeys(); // 1
if (allKeys.length) { // 2
let filteredKeys = allKeys.filter(key => !key.includes('not')); // 3
let items = await Promise.all(filteredKeys.map(async key => { // 4
let value = await AsyncStorage.getItem(key);
return { key, value }; // 5
}))
let filteredTrueItems = items.filter(item => items.value === 'true'); // 6
let filteredFalseItems = items.filter(item => items.value !== 'true'); // 7
// now you have two arrays one with the items that have the true values
// and one with the items that have the false values
// at this points you can decide what to return as it is not
// that clear from your question
// return the value that your want // 8
} else {
// return your default value if there are no keys // 8
}
}
You would call this function as follows:
_fetchData = async () => {
let channel = await this._getFetchData();
console.log("channel required: " + channel);
}
Although the above will work, it will not currently return a value as you haven't made it clear which value you wish to return. I would suggest you build upon the code that I have written here and update it so that it returns the values that you want.
Further reading
For further reading I would suggest these awesome articles by Michael Chan that discuss state
https://medium.learnreact.com/setstate-is-asynchronous-52ead919a3f0
https://medium.learnreact.com/setstate-takes-a-callback-1f71ad5d2296
https://medium.learnreact.com/setstate-takes-a-function-56eb940f84b6
I would also suggest taking some time to read up about async/await and promises
https://medium.com/#bluepnume/learn-about-promises-before-you-start-using-async-await-eb148164a9c8
And finally this article and SO question on Promise.all are quite good
https://www.taniarascia.com/promise-all-with-async-await/
Using async/await with a forEach loop
Try this instead. Async functions and Promises can be tricky to get right and can be difficult to debug but you're on the right track.
async _getFetchData() {
let channels = "";
let results = await AsyncStorage.getAllKeys();
results.forEach((result) => {
if (result.includes("not") === false) {
let item = await AsyncStorage.getItem(result);
if (item === 'true') {
console.log(`channel: ${result}`)
channels = `channel_id ${result}`;
}
}
});
return channels;
}
_fetchData() {
this._getFetchData().then((channels) => {
console.log(`channel required: ${channel}`);
});
}
what if you wrap the _getFetchData() in a Promise? This would enable you to use
var channel = this._getFetchData().then(console.log("channel required: " + channel));
Otherwise the console.log won't wait for the execution of the _getFetchData().
This is what the console.log is telling you. it just logs the string. the variable is added after the async operation is done.
UPDATE
I would try this:
//_getFetchData()
AsyncStorage.getAllKeys().then((result) => { //get all stored Keys
valuelength = result.length;
if (valuelength !== 0) {
for (let i = 0; i < valuelength; i++) {
if (result[i].includes("not") == false) { //get Keys without not
AsyncStorage.getItem(result[i]).then((resultvalue) => {
if (resultvalue === 'true') {
if (this.state.firstValue) {
this.state.channels = this.state.channels + "channel_id" + result[i];
console.log("channel: " + this.state.channels);
}
else {
this.state.channels = this.state.channels + "channel" + result[i];
}
}
});
}
return new Promise((resolve, reject) => {
this.state.channels !=== undefined ? resolve(this.state.channels) : reject(Error('error '));
}
_fetchData() {
var channel = this._getFetchData().then(console.log("channel required: " + channel));
}
maybe you must change the this.state.channels !=== undefined to an expression that's matches the default value of this.state.channels.
I'm trying to test if an Html video is currently playing, but can't seem to figure out how to get the currentTime. I've been trying things like:
async videoIsPlaying(indexOfVideo = 0) {
return ClientFunction(() => {
const video = document.getElementsByTagName('video')[indexOfVideo];
return video.currentTime > 0;
});
}
but my expect:
await t.expect(await playerPage.videoIsPlaying()).eql(true);
is returning:
AssertionError: expected [Function: __$$clientFunction$$] to deeply equal true
What am I doing wrong? Also, I'm using .eql() because .ok() returns truthy for any result.
Ahhh... just needed to fire the function, and also pass in the index thusly...
async videoIsPlaying(indexOfVideo = 0) {
return await ClientFunction((indexOfVideo) => {
const video = document.getElementsByTagName('video')[indexOfVideo];
return video.currentTime > 0;
})(indexOfVideo);
}
Just FYI, this function lives in a page object
I am looping through an object however in the asynchronous part the i variable is always five.
How can I maintain that value, or pass it into the function
getProductData: function() {
var vm = this;
for (var i = 0; i < vm.recommendationResponse['recommendedItems'].length; i++) {
var sku = vm.recommendationResponse['recommendedItems'][i]['items'][0]['id'];
vm.$http.get('http://127.0.0.1:8000/models/api/productimage/' + sku).then(response => {
// get body data
vm.recommendationResponse['recommendedItems'][i]['items'][0]['image_url'] = response.body['product_image_url'];
vm.recommendationResponse['recommendedItems'][i]['items'][0]['price'] = response.body['price'];
}, response => {
vm.recommendationResponse['recommendedItems'][i]['items'][0]['image_url'] = '';
vm.recommendationResponse['recommendedItems'][i]['items'][0]['price'] = '';
});
}
}
I I do something like this:
vm.$http.get('http://127.0.0.1:8000/models/api/productimage/' + sku).then((response, i) => ...
then i is undefined
Who do I keep the index of the loop or should I go about it a different way?
Always use let to initialize variables in for loop when dealing with async operations. Similar things goes to having for loops in intervals. By using let you make sure you always have a unique variable assigned to i.
for (let i = 0, recommendationlength = vm.recommendationResponse['recommendedItems'].length; i < recommendationlength; i++)
Little bonus, if you cache array length in the beginning you get a small performance boost :-)
You could use Array.prototype.forEach instead:
var vm = this;
vm.recommendataionResponse['recommendedItems'].forEach((item, i) => {
var sku = vm.recommendationResponse['recommendedItems'][i]['items'][0]['id'];
vm.$http.get('http://127.0.0.1:8000/models/api/productimage/' + sku).then(response => {
// get body data
vm.recommendationResponse['recommendedItems'][i]['items'][0]['image_url'] = response.body['product_image_url'];
vm.recommendationResponse['recommendedItems'][i]['items'][0]['price'] = response.body['price'];
}, response => {
vm.recommendationResponse['recommendedItems'][i]['items'][0]['image_url'] = '';
vm.recommendationResponse['recommendedItems'][i]['items'][0]['price'] = '';
});
})
This way, since there is a unique scope for each i value, each .then callback will be able to reference the correct value.
Im new to React Native and Im using react-native-db-models. I have searched stackoverflow for fetching the data and it gave me this code below
DB.users.get_all((result) => {
let data = [];
for (let i = 1; i <= result.totalrows; i++) {
data.push(result.rows[i]);
}
but result.rows[i] returns undefined. Any ideas how and why?
I tried my own solution but this time it gave me another problem. This is my code
DB.expense.get_all(function(result){
var data = [];
for (let i = 1; i <= result.totalrows; i++) {
let j = result.autoinc;
let id = j - i;
DB.expense.get_id(id, function(results){
data.push(result)
})
}
}
when I put console.log(data) after data.push(result) it works fine. But when I put console.log(data) outside DB.expense.get_id function, console.log(data) returns an empty array.
I really need your help guys