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I have an object like below:
Parent: { Child1: [ {name:'grandchild1', value:'abc', checked:true}, {name:'grandchild2', value:'pqr', checked:false} ], Child2: [ {name:'grandchild3', value:'abcd', checked:false}, {name:'grandchild4', value:'pqrs', checked:true} ], parent2{...........}.... };
How can I make it nested JSON.
Just like in root: parent1, parent2...
Child: children1, ....( Corresponding to parent)
Grandchildren: based on children
Please guide me how can I make it?
To make a JSON object you just have to follow JSON syntax
In your example it will look like:
{
"parent": {
"child1": [{
"name": "grandchild1",
"value": "abc",
"checked": "true"
}, {
"name": "grandchild2",
"value": "pqr",
"checked": "false"
}]
}
}
Please note that in JSON, string values must be written with double quotes.
If you need to get JSON string from object programmatically, you can write in javascript:
var myJSON = JSON.stringify(obj);
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There is an object
let response = {
"meta": {
"id": 781
},
"content": {
"title": "Test",
"min": "1",
"max": "30",
"series": [
{
"name": "A",
"data": []
},
{
"name": "B",
"data": [3, 5, 6]
}
]
}
}
I need to check if any array of key, data is an empty array from series array. So, basically
if any data is empty array from series {
// do something
}
How can I achieve that?
you can try this one
let temp = response.content.series;
let num_of_empty_arr=0;
for(let i=0;i<temp.length;i++){
let obj=temp[i];
if(obj.data.length==0)
num_of_empty_arr++;
}
console.log("totol empty arrays",num_of_empty_arr);
you can do this by looping through response.content.series
for(let i of response.content.series){
if(i.data.length === 0){
//do something
console.log(i.name)
}
}
some allows you to return a boolean (true or false) based on a condition. Use it on the series data and return a value based upon whether the data array has any elements.
let response={meta:{id:781},content:{title:"Test",min:"1",max:"30",series:[{name:"A",data:[]},{name:"B",data:[3,5,6]}]}};
let response2={meta:{id:781},content:{title:"Test",min:"1",max:"30",series:[{name:"A",data:[1,2]},{name:"B",data:[3,5,6]}]}};
function areSomeEmpty(data) {
return data.content.series.some(arr => !arr.data.length);
}
console.log(areSomeEmpty(response));
console.log(areSomeEmpty(response2));
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Hey please don't roast me. So i have a JSON data like this
data": {
"person": [
{
"id": "xx1",
"name": "John DOe",
},
],
"person": [
{
"id": "xx2",
"name": "John Snow",
},
],
}
For example, I want to store every person data whose name contains "o". How could I do that? Thank you
JSON object ,if have duplicate keys, it will replace the first one with the most bottom one .
In your sample data, there is two "person" keys. Therefore, at the end, your said data will succumb to this.
{"data":{"person":[{"id":"xx2","name":"John Snow"}]}}
Therefore, to clarify your data, IMHO, this is supposed to be like this in the first place.
"data": {
"person": [
{
"id": "xx1",
"name": "John DOe",
},
{
"id": "xx2",
"name": "John Snow",
},
]
}
Then you can treat data.person as an array and use Array.prototype function to filter out your desired details.
The filter method should be
const personWithNameO = data.person.filter((v) => v.name.includes("o") );
console.log(personWithNameO);
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I do have json like below
[
[{
"id": "4e181c1b-0a68-425e-9eb7-df36324b6cdb",
"date_actual": {
"value": "2020-10-21T13:15:00"
},
"Date": "20201021",
"name": "abc"
},
{
"id": "4e181c1b-0a68-425e-9eb7-df36324qqq",
"date_actual": {
"value": "2020-1-21T13:15:00"
},
"Date": "2020102",
"name": "xyz"
}
]
]
want to modified like below
[
{
"id": "4e181c1b-0a68-425e-9eb7-df36324b6cdb",
"date_actual": "2020-10-21T13:15:00",
"Date": "20201021",
"name": "abc"
},
{
"id": "4e181c1b-0a68-425e-9eb7-df36324qqq",
"date_actual": "2020-10-21T13:15:00",
"Date": "2020102",
"name": "xyz"
}
]
My service class code is
const rows = await bigqueryClient.query(queryData);
console.log("old json"+JSON.stringify(rows));
return rows;
how to solve this issue using nestjs any way please help me ?
This isn't specific to NodeJS or NestJS, but is regular old JavaScript. As you have an array of values you can use the Array.prototype.map method to map to a new array
return origArray.map((val) => ({ ...val, date_actual: val.date_actual.value }))
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I have a JSON payload with a service in my component, but then I'm not sure how would I obtain a reference to the list items component objects from the parent component.
You can do this using ngFor loop.
{
"data": [
{
"id": "4",
"name": " Name1"
},
{
"id": "21",
"name": " Name2"
},
{
"id": "24",
"name": " Name3"
},
{
"id": "11",
"name": " Name4"
}
]
}
In HTML Code
<select>
<option *ngFor="let item of data"
[value]="item.id" >
{{item.name}}
</option>
</select>
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I have a JSON file like this:
{[
{"name":"avc"},
{"name":"Anna"},
{"name":"Peter"},
{"Folder":[
{"name":"John"},
{"name":"Anna"},
{"Folder":[
{"name":"gg"},
{"name":"hh"}
]
}
]
}
]
}
It can be nested to any number of levels.
I want to traverse this file for any number of levels.
How can I achieve this using Javascript/JQuery
Thanks
You could iterate with Array#forEach and if a Folder is an array, then iterate that, too.
var a = [{ "name": "avc" }, { "name": "Anna" }, { "name": "Peter" }, { "Folder": [{ "name": "John" }, { "name": "Anna" }, { "Folder": [{ "name": "gg" }, { "name": "hh" }] }] }];
a.forEach(function iter(a) {
if (Array.isArray(a.Folder)) {
a.Folder.forEach(iter);
return;
}
console.log(a.name);
});
I read your question like this:
How can I iterate through an array of object, where an object may have
children of it's own. And every child may have children and so on...
One way is to write a recursive function, which is a function that calls itself. Here's a recursive function which will log every post into console.
Note that I've changed your model into a proper object. Also, I've added name to folder, but that can be removed if not necessary.
var a = [
{name:"avc"},
{name:"Anna"},
{name:"Peter"},
{name:"Folder name1",
folder:[
{name:"John"},
{name:"Anna"},
{name: "Folder name2",
folder:[
{name:"James"},
{name:"Clark"},
{name: "Folder name3",
folder:[
{name:"Cecilia"},
{name:"Clara"}
]},
{name:"Stephen"}
]
}
]
}
];
function read(obj){
for(var i = 0; i < obj.length; i++)
{
console.log(obj[i].name); // Or do what you need here...
if(obj[i].folder)
{
// Recursive call
read(obj[i].folder);
}
}
}
read(a);