I am working with angular 6 and ngx-chart and I need on clicking the legend item, the corresponding data from the chart should show/hide
The ng-chart library does have this functionality and my client requests it.
Edit01:
I have almost everything working but I have a problem when applying axisFormat. once I remove an item from the legend it reformats the x-axis and doesn't literally put how the data comes without applying the AxisFormat. Any solution?
onSelect (event) {
let temp = JSON.parse(JSON.stringify(this.multi));
this.sourceData = JSON.parse(JSON.stringify(this.multi2));
if (this.isDataShown(event)) {
//Hide it
temp.some(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
// console.log('pie', pie[0], event, pie2);
if (pie2 === event) {
pie.series = [];
return true;
}
});
} else {
//Show it back
console.log('Entramos en el ELSE');
const pieToAdd = this.sourceData.filter(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
return pie2 === event;
});
temp.some(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
if (pie2 === event) {
pie.series = pieToAdd[0].series;
return true;
}
});
}
console.log('log temp: ' + JSON.stringify(temp));
this.multi = temp;
// this.axisFormat(this.multi);
}
isDataShown = (name) => {
const selectedPie = this.multi.filter(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
return pie2 === name && pie.series[0] !== undefined;
});
return selectedPie && selectedPie.length > 0;
}
axisFormat(val) {
const options = { day: 'numeric', month: 'short', hour: '2-digit', minute: '2-digit' };
// Esto funciona pero al hacer timeline no pone horas val.toLocaleDateString("es-ES", options);
console.log('val:', val.toLocaleDateString('es-ES', options));
return val.toLocaleDateString('es-ES', options);
}
HTML
<ngx-charts-line-chart [view]="" [scheme]="colorScheme" [results]="multi" [gradient]="gradient" [xAxis]="showXAxis" [yAxis]="showYAxis" [legend]="showLegend" legendPosition="'below'" [showXAxisLabel]="showXAxisLabel" [showYAxisLabel]="showYAxisLabel"
[xAxisLabel]="xAxisLabel" [yAxisLabel]="yAxisLabel" [autoScale]="autoScale" [timeline]="timeline" [roundDomains]="true" [animations]="animations" (select)="onSelect($event)" [xAxisTickFormatting]="axisFormat">
<ng-template #seriesTooltipTemplate let-items="model">
<p>{{items[0].name | date:'medium'}}</p>
<ul>
<li *ngFor="let item of items">
{{item.series}}: {{item.value | number}}
</li>
</ul>
</ng-template>
</ngx-charts-line-chart>
EDIT
Hello,
I have already managed to solve the problem adding an example in case it can help other people.
https://stackblitz.com/edit/click-lengd-ngx-charts
I am kinda new to Stack Overflow, but i think you should specify your answer more and show us what you already tried. Nevertheless I will try to help you.
You should give your chart a (select)="onClickFunction ($event)" in HTML. In your TS you then call the onClickFunction(event). I always start with giving it a console.log(event) to see what i get from clicking on the legend.
After clicking on the legend, you get the label of the element you clicked on. You can then search for this label in your data and remove this data out of the array you use for filling the chart.
If you provide a stackblitz or plunker wtih your code, I will gladly show you how to do it.
This is how we can achieve it for ngx-pie-chart. With the help of select event, capture it, identify the item from the data and make it zero. Next, on the next click, add the value back from the source copy. See it working here ngx-pie-chart label-filter
onSelect (event) {
let temp = JSON.parse(JSON.stringify(this.single));
if (this.isDataShown(event)) {
//Hide it
temp.some(pie => {
if (pie.name === event) {
pie.value = 0;
return true;
}
});
} else {
//Show it back
const pieToAdd = this.sourceData.filter(pie => {
return pie.name === event;
});
temp.some(pie => {
if (pie.name === event) {
pie.value = pieToAdd[0].value;
return true;
}
});
}
this.single = temp;
}
isDataShown = (name) => {
const selectedPie = this.single.filter(pie => {
return pie.name === name && pie.value !== 0;
});
return selectedPie && selectedPie.length > 0;
}
I'm trying another solution to my problem:
The thing is: im rendering a Sketch component with a background image and sketching over it
onReady = async () => {
const { layoutWidth, layoutHeight, points } = this.state;
this.sketch.graphics = new PIXI.Graphics();
const linesStored = this.props.screenProps.getSketchLines();
if (this.sketch.stage) {
if (layoutWidth && layoutHeight) {
const background = await PIXI.Sprite.fromExpoAsync(this.props.image);
background.width = layoutWidth * scaleR;
background.height = layoutHeight * scaleR;
this.sketch.stage.addChild(background);
this.sketch.renderer._update();
}
if (linesStored) {
for(let i = 0; i < linesStored.length; i++) {
this.sketch.stage.addChild(linesStored[i])
this.sketch.renderer._update();
}
}
}
};
this lineStored variable is returning a data i've saved onChange:
onChangeAsync = async (param) => {
const { uri } = await this.sketch.takeSnapshotAsync();
this.setState({
image: { uri },
showSketch: false,
});
if (this.sketch.stage.children.length > 0) {
this.props.screenProps.storeSketchOnState(this.sketch.stage.children);
}
this.props.callBackOnChange({
image: uri,
changeAction: this.state.onChangeAction,
startSketch: this.startSketch,
undoSketch: this.undoSketch,
});
};
storeSketchOnState saves this.sketch.stage.children; so when i change screen and back to the screen my Sketch component in being rendered, i can retrieve the sketch.stage.children from App.js state and apply to Sketch component to persist the sketching i was doing before
i'm trying to apply the retrieved data like this
if (linesStored) {
for(let i = 0; i < linesStored.length; i++) {
this.sketch.stage.addChild(linesStored[i])
this.sketch.renderer._update();
}
}
```
but it is not working =(
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.
$data.names[0] = 'Joe') would not update the reactively rendered
components. Depending on how you process the server side results you
might need to think about these options described in the in vue
documentation: Array Change Detection.
Some ideas to explore:
using the v-bind:key="some_id" to have better using the push to add
new elements using Vue.set(example1.items, indexOfItem, newValue)
(also mentioned by Artokun)
Source
Note that it works but im busy so i cant optimize it, but its a little bit too complicted, i Edit it further tomorrow.
Since Vue.js has some caveats detecting array modification as other answers to this question highlight, you can just make a shallow copy of array before randomazing it:
randomise: function() {
// make shallow copy
let input = this.list.map(function(item) {
return item;
});
for (let i = input.length-1; i >=0; i--) {
let randomIndex = Math.floor(Math.random()*(i+1));
let itemAtIndex = input[randomIndex];
input[randomIndex] = input[i];
input[i] = itemAtIndex;
}
this.list = input;
}
I have a UIWebView with some YouTube Videos embeded via the iframe code:
<iframe width="190" height="102" src="http://www.youtube.com/embed/...?showinfo=0" frameborder="0" allowfullscreen></iframe>
When it first loads it is possible to view each video exactly once. After viewing it the area is just black with white "Youtube" in it.
Any ideas? Of course reloading the UIWebView after watching a video fixes it, but I don't like this...
I did it! The following Javascript did the job:
<script>
VideoIDs = new Array(...some ids here...);
function getFrameID(id){
var elem = document.getElementById(id);
if (elem) {
if(/^iframe$/i.test(elem.tagName))
return id;
var elems = elem.getElementsByTagName("iframe");
if (!elems.length)
return null;
for (var i=0; i<elems.length; i++) {
if (/^https?:\/\/(?:www\.)?youtube(?:-nocookie)?\.com(\/|$)/i.test(elems[i].src))
break;
}
elem = elems[i];
if (elem.id)
return elem.id;
do {
id += "-frame";
} while (document.getElementById(id));
elem.id = id;
return id;
}
return null;
}
var YT_ready = (function(){
var onReady_funcs = [], api_isReady = false;
return function(func, b_before){
if (func === true) {
api_isReady = true;
for (var i=0; i<onReady_funcs.length; i++){
onReady_funcs.shift()();
}
} else if(typeof func == "function") {
if (api_isReady)
func();
else
onReady_funcs[b_before?"unshift":"push"](func);
}
}
})();
function onYouTubePlayerAPIReady() {
YT_ready(true)
}
(function(){
var s = document.createElement("script");
s.src = "http://www.youtube.com/player_api";
var before = document.getElementsByTagName("script")[0];
before.parentNode.insertBefore(s, before);
})();
var players = new Array();
YT_ready(function() {
for(index in VideoIDs) {
var frameID = getFrameID(VideoIDs[index]);
if (frameID) {
players[frameID] = new YT.Player(frameID, {
events: {
"onStateChange": stateChange
}
});
}
}
});
function youtube_parser(url){
var regExp = /^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))\??v?=?([^#\&\?]*).*/;
var match = url.match(regExp);
if (match&&match[7].length==11){
return match[7];
}
}
function stateChange(event) {
if(event.data == YT.PlayerState.ENDED){
document.location = 'callback:finished';
document.getElementById(youtube_parser(event.target.getVideoUrl())).contentWindow.location.reload(true);
}
}
</script>
The Setup I have a full screen horizontal slider with 5+ divs that moves to the left when you click on an anchor link. I have some basic knowledge of jquery, and did attempted to use (scrollLeft). But the div is the wrapper div is hiding over flow and doesn't really go anywhere.
The goal is to animate the content inside the container div when it becomes the current container, and undo animation when it does to a different div.
The Issue: I got the animation to play, but have no control over when it starts.
The HTML
<div class="contentItem" id="content2">
<div id="top-box"></div>
<div id="bottom-box"></div>
</div>
<div class="contentItem" id="content3"></div>
<div class="contentItem" id="content4"></div>
<div class="contentItem" id="content5"></div>
The javascript
var theWidth;
var theHeight;
var currentContent = 0;
$(window).resize(function () {
sizeContent();
});
$(window).ready(function () {
sizeContent();
});
function sizeContent() {
theWidth = $(window).width();
theHeight = $(window).height();
sizeContentItems();
setLeftOnContentItems();
sizeContentWrapper(theWidth, theHeight);
moveContent(currentContent, theWidth);
changeSelected(currentContent);
}
function sizeContentItems() {
$(".contentItem").css('width', theWidth);
$(".contentItem").css('height', theHeight);
}
function setLeftOnContentItems() {
var contentCount = 0;
$(".contentItem").each(function (i) {
contentCount += i;
$(this).css('left', i * 990); //slider contern hight
});
}
function sizeContentWrapper(width, height) {
$("#contentWrapper").css('width', width);
$("#contentWrapper").css('height', height);
}
function moveContent(i, width) {
$("#contentWrapper").scrollLeft(i * width);
}
function changeSelected(i) {
$(".selected").removeClass("selected");
$("li:eq(" + i + ") a").addClass("selected");
}
function scrollContentNext() {
scrollContent(currentContent + 1);
}
function scrollContent(i) {
i = checkMax(i);
scrollLogo(i);
scrollTriangle(i);
changeSelected(i)
currentContent = i;
$("#contentWrapper").animate({ scrollLeft: i * 990 }, 400); // how far to go
}
function scrollLogo(i) {
var left = (i * +200);
$("#logo").animate({ left: left }, 1000);
}
function scrollTriangle(i) {
var left = (i * -300);
$("#triangle").animate({ left: left }, 700);
}
// **my edit**
function scrollbox(i) {
var i = currentContent;
if ( currentContent = 2) {
$("#bottom-box").stop().animate({'margin-top': '200px'}, 1500);
}
}
function checkMax(i) {
var maxItems = $("li").length;
if (i >= maxItems) {
return 0;
}
return i;
}