I have this small db i have created in loki js
var db = new loki('loki.json');
var children = db.addCollection('children');
I have added some items and now i am trying to remove an item by the value.
I am storing my values like this
var date = new Date();
var timestamp = date.getTime();
children.insert({name:pn,ts:timestamp});
and removing like this
var results = children.find();
console.log('before removal',results);
children.chain().find({'name':field_val}).remove();
console.log('after removal',results);
This is the result screenshot
My removal code does not work since it does not remove all items and does not remove in the correct order.
How can i remove an item by value?.
i think it should be children.chain().find({'name':field_val}).remove();
Related
I'm new to coding, and I need to display past search values from an input field using localstorage. The only way I can think of is by using one object key with an array of stored values from an on click event. Problem is, I can only get one position to appear as a value, with each value generated replacing the last. I've tried for loops and can't seem to get it to work. This is the code I have so far:
$('.search-city').on('click', function(e){
e.preventDefault();
var textArr = [];
var text = $(".form-control").val();
textArr.push(text);
localStorage.setItem("value1", textArr);
});
$('.search-city').on('click', function(e){
e.preventDefault();
var search = localStorage.getItem("value1")
This would work:
$('.search-city').on('click', function(e){
e.preventDefault();
// get the value from local storage
var localValue = localStorage.getItem('value1');
// if we had a value, parse it back to an array, if we dont, create an empty array
var textArr = localValue ? JSON.parse(localValue) : [];
// get the text from the search input, dont use "form-control"
// you're likely to have several of those on the page
// give the element a custom class like "search-input" and use that (id would be even better)
var text = $('.search-input').val();
// add the text to the array
text = trim(text);
if (text) {
textArr.push(text);
}
// enforce a size limit here by removing the 0 index item if the count has grown too large
var maxAllowed = 10;
while (textArr.length > maxAllowed) {
textArr.shift();
}
// localstorage can only hold simple strings so we'll JSON stringify our object and store that
localValue = JSON.stringify(textArr);
localStorage.setItem("value1", localValue);
});
I'm really sorry for I am aware similar questions have already been asked, but whenever I try to do it myself, none seem to apply or work. Basically when a user clicks on one of the elements, I am trying to get the following variables:
the id of the selected element
an array with all of the values prior to selected + selected one
an array with all of the values post-selected (selected not included)
the id of the element directly following the selected one
Thanks to your help in different posts, I have so far managed to complete the first two ones (in italic), but am unable to achieve the other two.
Would anyone know how to do so please? Thank you all in advance for your help!!
jQuery:
var days = ['#monday','#tuesday','#wednesday','#thursday','#friday','#saturday','#sunday'];
$('.days').on('click', function() {
var day = '#'+this.id;
var index = days.indexOf(day)+1;
var prev = days.slice(0, index);
var next = days.slice(index);
var above = days[index];
});
Should look more like this (though I really don't understand your code logic):
var dayIds = ['monday','tuesday','wednesday','thursday','friday','saturday','sunday'];
$('.days').on('click', function() {
//get selected element id
var dayId = this.id;
//find selected position in array and delete all values after
var dayPos = dayIds.indexOf(dayId);
var daysBelow = dayIds.slice(0, dayPos + 1;
//find position of item directly after selected and get value
var dayAfterPos = dayIds.indexOf(dayId) + 1;
var dayAfter = dayIds[dayAfterPos]; //(not working)
//only keep values following selected one
...
console.log(floorsBelow, floorId);
});
This is how you need to slicing the array. I'm not sure all the requirements you have so I have just taken out a snippet to demonstrate how you can get your values.
var dayIds = new Array('#monday','#tuesday','#wednesday','#thursday','#friday','#saturday','#sunday');
const current = '#thursday';
const currentIndex = dayIds.indexOf(current)+1;
const prev = dayIds.slice(0, currentIndex);
const next = dayIds.slice(currentIndex);
console.log(current); //#thursday
console.log(prev); //[ '#monday', '#tuesday', '#wednesday', '#thursday' ]
console.log(next); // [ '#friday', '#saturday', '#sunday' ]
EDIT:
Added newVar to contain next value
var dayIds = new Array('#monday','#tuesday','#wednesday','#thursday','#friday','#saturday','#sunday');
const current = '#thursday';
const currentIndex = dayIds.indexOf(current)+1;
const prev = dayIds.slice(0, currentIndex);
const next = dayIds.slice(currentIndex);
const newVar = dayIds[currentIndex];
console.log(current); //#thursday
console.log(prev); //[ '#monday', '#tuesday', '#wednesday', '#thursday' ]
console.log(next); // [ '#friday', '#saturday', '#sunday' ]
console.log(newVar); // #friday
I have very strange problem. I am creating an array of date objects (mondays)
// array to hold week commencing dates
var mondays = [];
mondays.push(today);
var novi = new Date(today);
while(novi < endDate){
var next_monday = new Date(novi.setDate(novi.getDate() + 7));
day_index = next_monday.getDay();
if(day_index == 1){
mondays.push(next_monday);
}
// increment the date
novi = next_monday;
}
console.log(mondays);
UPDATE: Thanks for reply. I created new object at start and used that one.So again i am creating empty array, then adding one date to it before starting loop, then first item in loop doesnt get added, even tho it gets pushed. What am i doing wrong?
This is console.log that i am getting from above.
https://www.dropbox.com/s/04bckfcrwl7yvwd/Screenshot%202016-09-28%2018.29.25.png?dl=0
today.setDate(today.getDate() + 7)
You are modifying the date object you pushed into the array.
The first item isn't being deleted, it is being changed.
var next_monday = new Date(today.setDate(today.getDate() + 7));
Then you create a new date object from it.
Create the new date object first, then modify that.
I am pretty new to the 'game' and was wondering if it's possible to order newly added data (through a form and inputs) to the Firebase numerically so each new data entry gets the ID (number of the last added data +1).
To make it more clear, underneath you can find a screenshot of how data is currently being added right now. The datapoint 0-7 are existing (JSON imported data) and the ones with the randomly created ID belong to new entries. I would like to have the entries to comply to the numbering inside of my Firebase, because otherwise my D3 bar chart won't be visualised.
var firebaseData = new Firebase("https://assignment5.firebaseio.com");
function funct1(evt)
{
var gameName = $('#nameInput').val();
var medalCount = $('#medalsInput').val();
var bool = $('#boolInput').is(':checked');
firebaseData.push().set({games: gameName, medals: medalCount, summergames: bool});
evt.preventDefault();
}
var submit = document.getElementsByTagName('button')[0];
submit.onclick = funct1;
UPDATE:
function funct1(evt)
{
var gameName = $('#nameInput').val();
var medalCount = $('#medalsInput').val();
var bool = $('#boolInput').is(':checked');
for (var i = 0; i < 10; i++)
{
firebaseData.child('7' + i).set({games: gameName, medals: medalCount, summergames: bool}(i)); };
Problem:
There are two ways to generate ids for your document nodes.
Calling .push() on your reference will generate that unique id.
Calling .set() on your reference will allow you to use your own
id.
Right now you're using .push().set({}), so push will generate an new id and the set will simply set the data.
// These two methods are equivalent
listRef.push().set({user_id: 'wilma', text: 'Hello'});
listRef.push({user_id: 'wilma', text: 'Hello'});
Using .set() without .push() will allow you to control your own id.
Using .push():
When managing lists of data in Firebase, it's important to use unique generated IDs since the data is updating in real time. If integer ids are being used data can be easily overwritten.
Just because you have an unique id, doesn't mean you can't query through your data by your ids. You can loop through a parent reference and get all of the child references as well.
var listRef = new Firebase('https://YOUR-FIREBASE.firebaseio.com/items');
// constructor for item
function Item(id) {
this.id = id;
};
// add the items to firebase
for (var i = 0; i < 10; i++) {
listRef.push(new Item(i));
};
// This will generate the following structure
// - items
// - LGAJlkejagae
// - id: 0
// now we can loop through all of the items
listRef.once('value', function (snapshot) {
snapshot.forEach(function (childSnapshot) {
var name = childSnapshot.name();
var childData = childSnapshot.val();
console.log(name); // unique id
console.log(childData); // actual data
console.log(childData.id); // this is the id you're looking for
});
});
Within the childData variable you can access your data such as the id you want.
Using .set()
If you want to manage your own ids you can use set, but you need to change the child reference as you add items.
for (var i = 0; i < 10; i++) {
// Now this will create an item with the id number
// ex: https://YOUR-FIREBASE.firebaseio.com/items/1
listRef.child('/' + i).set(new Item(i));
};
// The above loop with create the following structure.
// - items
// - 0
// - id: 0
To get the data you can use the same method above to loop through all of the child items in the node.
So which one to use?
Use .push() when you don't want your data to be easily overwritten.
Use .set() when your id is really, really important to you and you don't care about your data being easily overwritten.
EDIT
The problem you're having is that you need to know the total amount of items in the list. This feature is not implemented in Firebase so you'll need to load the data and grab the number of items. I'd recommend doing this when the page loads and caching that count if you really desire to maintain that id structure. This will cause performance issues.
However, if you know what you need to index off of, or don't care to overwrite your index I wouldn't load the data from firebase.
In your case your code would look something like this:
// this variable will store all your data, try to not put it in global scope
var firebaseData = new Firebase('your-firebase-url/data');
var allData = null;
// if you don't need to load the data then just use this variable to increment
var allDataCount = 0;
// be wary since this is an async call, it may not be available for your
// function below. Look into using a deferred instead.
firebaseData.once('value', function(snapshot) {
allData = snapshot.val();
allDataCount = snapshot.numChildren(); // this is the index to increment off of
});
// assuming this is some click event that adds the data it should
function funct1(evt) {
var gameName = $('#nameInput').val();
var medalCount = $('#medalsInput').val();
var bool = $('#boolInput').is(':checked');
firebaseData.child('/' + allDataCount).set({
games: gameName,
medals: medalCount,
summergames: bool
});
allDataCount += 1; // increment since we still don't have the reference
};
For more information about managing lists in Firebase, there's a good article in the Firebase API Docs. https://www.firebase.com/docs/managing-lists.html
We are using DHTMLX Grid. Need some help, please.
I have a table and each columns (has filter/dropdown) are allocated an id eg. fac, date, sel, loc, tag ... etc
We have hard coded the index of columns to set and get the cookie elsewhere.
function doInitGrid(){
mygrid.setColumnIds("fac,date,sel,loc,tag"); //set ids
mygrid.attachEvent("onFilterStart",function(ind,data)
{
setCookie("Tray_fac_filter",mygrid.getFilterElement(0).value,365); //column index 0
setCookie("Tray_loc_filter",mygrid.getFilterElement(3).value,365);//column index 3
setCookie("Tray_tag_filter",mygrid.getFilterElement(4).value,365); //column index 4
mygrid.getFilterElement(0).value = getCookie("Tray_fac_filter")
mygrid.getFilterElement(3).value = getCookie("Tray_dep_filter")
mygrid.getFilterElement(4).value = getCookie("Tray_prg_filter")
});
}
But when the columns are moved, the problem arises as the index of the column changes yet it is set in setCookie /getCoookie
DHTMLX allows to get the index of the id using --
var colInd = grid.getColIndexById(id);
eg: var colInd = grid.getColIndexById(date); // outputs 1.
After moving the date column to the end -- fac, sel, loc, tag, date // it will output 4.
However, we have about 14 columns that can be moved/rearranged and I could use the
var colInd = grid.getColIndexById(id); 15 times
var facInd = grid.getColIndexById("fac");
var dateInd = grid.getColIndexById("date");
var selInd = grid.getColIndexById("sel");
var locInd = grid.getColIndexById("loc";
var tagInd = grid.getColIndexById("tag");
and put those variables in the set/get cookie. I was thinking if there was a better way.
To understand the code better, I have put the minimised version of the code in fiddle.
http://jsfiddle.net/19eggs/s5myW/2/
You've got the best answer I think. Do it in a loop and it's easier:
var cookie_prefix = "Fray_filter_";
var cookie_dur = 365;
var num_cols = dhx_grid.getColumnCount();
// filter vals to cookies
for (var col_idx=0; col_idx<num_cols; col_idx++) {
var filter = mygrid.getFilterElement(col_idx)
if (filter) { // not all columns may have a filter
var col_id = dhx_grid.getColumnId(col_idx);
var cookie_name = cookie_prefix+col_id;
setCookie(cookie_name, filter.value, cookie_dur);
}
}
// cookies to filter vals
for (var col_idx=0; col_idx<num_cols; col_idx++) {
var col_id = dhx_grid.getColumnId(col_idx);
var filter_val = getCookie(cookie_prefix+col_id);
var filter = mygrid.getFilterElement(col_idx)
filter.value = filter_val;
}
You can use dhtmlxgrid native event to assign the correct id everytime a column is moved.
The event is called onAfterCMove, you can check the documentation here. onAfterCMove Event
You would do something like:
mygrid.attachEvent('onAfterCMove',function(cInd,posInd){
//Your processing here to change the cookies; where cInd is the index of the column moved
//and posInd, is the position where it Was moved
}):