how to set gridlayout from js from a string of layout defined - nativescript

I'm trying to set a grid layout as below in xml
layout: `<GridLayout row="0" rows="*, 2*, *">
<GridLayout width="57%" row="0" horizontalAlignment="center" verticalAlignment="center">
<Label class="lobster-regular carousel-item-head" text="Welcome to Payments App" textWrap="true"></Label>
</GridLayout>
<GridLayout class="carousel-item-circle" row="1" horizontalAlignment="center" verticalAlignment="center">
<Label class="fa carousel-item-icon" text="" textWrap="true"></Label>
</GridLayout>
<GridLayout width="49%" row="2" horizontalAlignment="center" verticalAlignment="center">
<Label class="opensans-regular carousel-item-desc" text="Let's see a quick overview of our features." textWrap="true"></Label>
</GridLayout>
</GridLayout>
`,
so i created a scroll view from js and tried to add content to it as below. but its giving stackerror.
also i found that https://play.nativescript.org/?template=play-js&id=sRSad7&v=162 here they implemented same thing. but difficult to understand.
but when i tried the similar thing i'm not able to do so, here is my project link. https://play.nativescript.org/?template=play-js&id=GbN2TT
const myScroll = new ScrollView();
myScroll.orientation = "vertical";
console.log(homeViewModel.layout);
myScroll.content = homeViewModel.layout;
please give me in detail suggestion and answer or alternative to achieve this.

Use UI Builder
const layout = `<GridLayout row="0" rows="*, 2*, *">
<GridLayout width="57%" row="0" horizontalAlignment="center" verticalAlignment="center">
<Label class="lobster-regular carousel-item-head" text="Welcome to Payments App" textWrap="true"></Label>
</GridLayout>
<GridLayout class="carousel-item-circle" row="1" horizontalAlignment="center" verticalAlignment="center">
<Label class="fa carousel-item-icon" text="" textWrap="true"></Label>
</GridLayout>
<GridLayout width="49%" row="2" horizontalAlignment="center" verticalAlignment="center">
<Label class="opensans-regular carousel-item-desc" text="Let's see a quick overview of our features." textWrap="true"></Label>
</GridLayout>
</GridLayout>
`;
const builder = require("tns-core-modules/ui/builder");
const gridLayout = builder.parse(layout);
myScroll.content = gridLayout;

Related

Nativescript - data not binding onTap

At certain point on my xml file i have this:
<GridLayout row="2" rowSpan="2" col="2" rows="*" columns="40,*,40" verticalAlignment="center" horizontalAlignment="right" marginRight="10">
<Label row="0" col="0" text="+" tap="onTapPlus" verticalAlignment="center" horizontalAlignment="center" style="color:black;font-family: 'Allerta Stencil', sans-serif;font-size:20px;"></Label>
<Label id="" row="0" col="1" text="{{nrItemsTakeAway}}" verticalAlignment="center" horizontalAlignment="center" style="color:black;font-family: 'Allerta Stencil', sans-serif;font-size:20px;text-align:center; width:50px;"></Label>
<Label row="0" col="2" text="-" tap="onTapMinus" verticalAlignment="center" horizontalAlignment="center" style="color:black;font-family: 'Allerta Stencil', sans-serif;font-size:20px;"></Label>
</GridLayout>
So when the user taps on the + button, the onTapPlus function is called and the nrItemsTakeAway is suppose to increment...so just for testing, i did this on my onTapPlus function:
function onTapPlus(args) {
const button = args.object;
const page = button.page;
vm.set("nrItemsTakeAway", "4");
page.bindingContext = vm;
but it doesn´t work...it is not binding, what am i missing here?

How to fix android ui performance

I'm getting:
Avoid using ListView or ScrollView with no explicit height set inside StackLayout. Doing so might results in poor user interface performance and a poor user experience.
My UI performance is very crappy on Android. It seems pretty smooth on iOS. I'm trying to figure out what could be the issue. This one error crops up for me. I'm running "nativescript-angular": "^8.0.0",
<ScrollView [visibility]="isBusy ? 'collapsed' : 'visible'" #sv>
<GridLayout rows="auto,auto,auto,auto" id="t2" columns="*" class="template_body">
<GridLayout row="0" col="0" #wv1wrapper>
<!-- <web-view id="instruction-wv" #wv1></web-view> -->
<template-text [data]="lessonDetail.instruction" *ngIf="lessonDetail.instruction" [screenwidth]="screenWidth"></template-text>
</GridLayout>
<StackLayout row="1" col="0" class="main-img">
<Image [src]="(lesson$ | async)?.thumbUrl" #imgref [data-image]="(lesson$ | async)?.imageUrl" (tap)="modalImage($event);"></Image>
</StackLayout>
<GridLayout row="2" col="0" #wvwrapper>
<!-- <web-view id="wv" #wv></web-view> -->
<template-text [data]="lessonDetail.body_text" [version]="version" *ngIf="lessonDetail.body_text" [screenwidth]="screenWidth"></template-text>
</GridLayout>
</GridLayout>
This is a template that is pulled into a router-outlet that looks like this in the master template:
<FlexboxLayout class="contentbody" [visibility]="isBusy ? 'hidden' : 'visible'" [data-template]="template_id">
<Label [text]="error" *ngIf="error"></Label>
<router-outlet></router-outlet>
</FlexboxLayout>
Also on that page, I do have a listview inside of a stacklayout.
<StackLayout row="0" >
<StackLayout class="vocab-notes">
<Label *ngIf="vocabArray" class="h3 section-title" text="Vocabulary"></Label>
<ListView [items]="vocabArray" id="vocablistview" (itemTap)="onItemTap($event)" class="list-items">
<ng-template let-item="item" let-i="index" let-odd="odd" let-even="even">
<GridLayout columns="*" rows="auto,auto" [class.odd]="odd" [class.even]="even" class="vocab-list">
<FlexboxLayout col="0" row="0" class="vocab-list-item-layout">
<Label [text]='item.label' textWrap="true" [id]="item.id" class="h3 vocab-list-item" (tap)="showVocab($event)"></Label>
</FlexboxLayout>
</GridLayout>
</ng-template>
</ListView>
</StackLayout>
I know its late for you but if someone is looking for this in future, so if you are getting below in console on any page you load.
JS: Avoid using ListView or ScrollView with no explicit height set inside StackLayout. Doing so might results in poor user interface performance and a poor user experience.
You just need to give your scrollView a height, try different heights like in my case I need 650
<Page class="main" actionBarHidden="true">
<StackLayout class="gradient-bg">
<ScrollView orientation="vertical" height="650"> <!-- Here height is 650 -->
<StackLayout>
<GridLayout rows="50" class="page-header">
<Label
row="0"
class="fa label-back"
:text="'fa-arrow-left' | fonticon"
v-on:tap="navigateTo('app')"
/>
<Label text="Plot Suggestion" row="0" class="lbl-heading" horizontalAlignment="center" />
...
...

Nativescript inner StackLayout

Hello everyone I'm trying to make inner StackLayouts but the second one comes to top of first one so that I can't see the second StackLayout should I handle with css if it is how or is there an other way
Here is my code
<StackLayout orientation="horizontal">
<StackLayout width="500">
<GridLayout columns="50, *" rows="*" width="500" height="50"
verticalAlignment="top">
<Label text="Name" row="0" col="0" backgroundColor="red">
</Label>
<Label text="Fol" row="0" col="1" class="alignRight"
backgroundColor="blue"></Label>
</GridLayout>
</StackLayout>
<StackLayout orientation="horizontal" width="500" height="180">
<Image src="http://lorempixel.com/400/200" width="500" left="10"
top="30">
</Image>
</StackLayout>
</StackLayout>
Thank you
At first I would delete the widths to see how the page is displayed. 500 is a very big value. Only large tablets can support that.
As an example at first I would try this :
<GridLayout columns="auto, auto">
<GridLayout col="0" columns="50, *" rows="*" verticalAlignment="top">
<Label text="Name" row="0" col="0" backgroundColor="red">
</Label>
<Label text="Fol" row="0" col="1" class="alignRight"
backgroundColor="blue"></Label>
</GridLayout>
<Image col="1" src="http://lorempixel.com/400/200" left="10" op="30">
</Image>
</GridLayout>
After you see the two parts align horizontally you can start tweaking the widths

center image in nativescript

After I try NativeScript tutorial "Grocery", I found out that its button quite hard to tap it's because tap area is too small, so I want to increase Image hight by update layout file to the following below. However, image not seem to be in the center (Image Below).
How can I achieve this in NativeScript ?
list.html
<ActionBar title="Groceries">
<ActionItem text="Share" (tap)="share()"
android.systemIcon="ic_menu_share_holo_dark"
ios.systemIcon="9" ios.position="right"></ActionItem>
</ActionBar>
<GridLayout rows="auto, *">
<GridLayout row="0" columns="*, auto" class="add-bar">
<TextField #groceryTextField [(ngModel)]="grocery" hint="Enter a grocery item" col="0"></TextField>
<StackLayout class="delete-container" height="100%" (tap)="add()" col="1" >
<Image src="res://add" stretch="none" horizontalAlignment="center"></Image>
</StackLayout>
</GridLayout>
<ListView [items]="groceryList" row="1" class="small-spacing" [class.visible]="listLoaded">
<ng-template let-item="item">
<GridLayout columns="*, auto">
<Label col="0" [text]="item.name" class="medium-spacing"></Label>
<StackLayout col="1" class="delete-container" height="100%" (tap)="delete(item)">
<Image src="res://delete"></Image>
</StackLayout>
</GridLayout>
</ng-template>
</ListView>
<ActivityIndicator
[busy]="isLoading" [visibility]="isLoading ? 'visible' : 'collapse'"
row="1" horizontalAlignment="center" verticalAlignment="center"></ActivityIndicator>
</GridLayout>
You should check out NS's FlexBox layout.
It is quite useful:
http://docs.nativescript.org/cookbook/ui/layouts/flexbox-layout

nativescript 'this' inside tkListViewHeader (RadListView header directive)

I'm using the TKListViewHeaderDirective of teleriks RadListView in nativescript like so:
<GridLayout columns="*" rows="*" tkToggleNavButton>
<RadListView *ngIf="!loading" row="3" col="0" [items]="nodes" ...>
<ng-template tkListItemTemplate let-node="item">
<!-- list item -->
</ng-template>
<ng-template tkListViewHeader>
<GridLayout columns="*" rows="auto, auto, auto">
<GridLayout row="0" col="0" columns="40,*,40">
<Button class="fa action-item" row="0" col="0" [text]="'fa-sort-amount-asc' | fonticon" ios.position="right" android="actionBar" style="background-color:#c9c9ce;;"></Button>
<SearchBar row="0" col="1" #searchInput hint="Search" (submit)="search(searchInput.text)" (clear)="search('')" (textChange)="search(searchInput.text)"></SearchBar>
<Button class="fa action-item" row="0" col="2" [text]="'fa-th' | fonticon" ios.position="right" android="actionBar" style="background-color:#c9c9ce;"></Button>
</GridLayout>
<StackLayout row="1" col="0">
<Label text="Hello world"></Label>
<Label [text]="currentNode.name"></Label>
<Label [text]="nodes?.length ? nodes.length : 0"></Label>
</StackLayout>
<StackLayout row="2" col="0" *ngIf="!nodes?.length" class="list-group">
<!-- some contents -->
</StackLayout>
<StackLayout row="3" col="0" *ngIf="currentNode?.name !== '/'" class="list-group">
<!-- some contents -->
</StackLayout>
</GridLayout>
</ng-template>
</RadListView>
</GridLayout>
it seems like two things go wrong here:
this seems to be missing here (the *ngIf should show one of the StackLayouts in specific cases but does not
The GridLayout (does not have any effect if I change it to StackLayout) inside the list header shows only one child element
According to the docs: http://docs.telerik.com/devtools/nativescript-ui/Controls/Angular/ListView/header-footer
There is an issue on github concerning this: https://github.com/telerik/nativescript-ui-feedback/issues/207

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