I have given a name using the #var notation to an angular component (app-backtester-chart) created by me, but I don't understand why I don't seem to be able to reference it outside of the div it is in?
I'm clearly missing something here...
{{chartcmp.width}}
<div class="row">
<div class="col" *ngIf="thisStrategy">
{{chartcmp.width}}
<app-backtester-chart #chartcmp
[inputStrategy]="thisStrategy"
[showBenchmark]="showBenchmark">
</app-backtester-chart>
</div>
</div>
The first {{chartcmp.width}} generates an error: Cannot read property 'width' of undefined
So why does the second one inside the div works, and correctly displays the width?
From the Angular documentation (Template reference variables):
You can refer to a template reference variable anywhere in the component's template.
I can't find an explanation anywhere. Any help would be greatly appreciated.
It's beacause of the *ngIf. You can't access a template reference variable if it's not rendred.
I think it's because your *ngIf if you're doing an ngIf all div inside are not constructed as well as your variable ^^
Try this for first one
{{chartcmp === null? "" : chartcmp.width}}
Related
In html am rendering some value in the and passing it as a input to a component like
below
<test-component
[title]= "data?.Kevin?.title"
</test-component>
Please be noted data?.Kevin?.title will give the title name.How ever, in the above, I want to render the name a bit dynamically like below
<test-component
[title]= "data?.{{name}}?.title"
</test-component>
{{name}} should render kevin and the tile value needs to be passed to the component.
Here the name is not being rendered correctly.
Any help is highly appreciated.
the solution is pretty simple: [title]= "data?.[name]?.title"
the equivalent of the first example would be: [title]= "data?.["Kevin"]?.title"
read more on https://www.w3schools.com/js/js_objects.asp see "Accessing Object Properties"
My Html Code is
<div ivh-treeview="menuPermissionObj.generalAssetManagement"
ivh-treeview-expand-to-depth="-1"
ivh-treeview-on-cb-change="changeCallback(ivhNode,ivhIsSelected, ivhTree)">
</div>
i used this plugin
https://github.com/iVantage/angular-ivh-treeview
is there any way to hide parent checkbox?
thanks in advance.
Yes, but you will need to use a custom node template.
See the list of supported helper methods and scope variables in your templates here: https://github.com/iVantage/angular-ivh-treeview/blob/master/docs/templates-and-skins.md#supported-template-scope-variables
Both isLeaf(node) and the depth variable will pair well with ng-show.
I have a template dom-repeat element. I know that I can define the items attribute from an array, so that item can be accessed inside the template. However, I don't know how to access other objects inside the template if I bind them to customer polymer elements.
In this example, items is being defined by someItems, and item is passed into the element <my-el>. I also have a string mine that I want to pass into <my-el> and use there. I currently have the idea to do this in app-el.html, which contains the dom-repeat template:
app-el.html
<template is="dom-repeat" items="[[someItems]]">
<my-el item=[[item]] mine="[[mine]]"></my-el><br>
</template>
In theory, I would be able to access both in my-el.html like this:
my-el.html
[[item]] [[mine]]
However, when I try to access mine from inside <my-el> it is undefined. How can I correctly pass in this string so I can access it?
An MCVE can be found on this Plunker. Note how the item string is defined inside <my-el> but the mine string is not.
Your data bindings look correct, but there is no mine property for my-app. Did you mean to define <my-app>.myProperty as <my-app>.mine? Changing that property name to mine fixes your problem.
plunker
I got an error when i put a nested ng-show attributes for custom directive,
one attribute in the markup of the directive and the second inside the root element of the directive template.
My real scenario are complex so i will simplify it to this example:
Suppose i have my-custom-directive below which already contains ng-show:
<my-custom-directive ng-show="someValue >= 5"></my-custom-directive>
And then the template of 'my-custom-directive' look like this:
<div ng-show="options != null">My Custom Directive</div>
Those multiple ng-show together cause an error.
if i remove one of them or move the inner ng-show at least one level deeper in it's dom tree the error gone (it's happen when it's location is on the root template element).
this error tested on angular v1.4.8.
Is this angular bug? or there is a reasonable explanation for this behavior?
here is the Plunker example:
http://embed.plnkr.co/ZTZVcfc5bfmjPo9t0Isw
Thank you in advance,
Menachem
Because the directive has replace: trueit is trying to merge the two ng-show values together resulting in an error. The simplest solution I believe is to just do replace: false
Or you can inject the value via isolate scope and use a single ng-show value within the directive. I believe this is considered the cleaner solution.
Example: http://plnkr.co/edit/5oc8c1Hrz8N1F2klCio7?p=info
scope: {
someValue: '=someValue'
}
When i use Angular to dynamic change div 's backgroundImage, i find there are two ways to set backgrond-image:
first:
<div style="background:url({{example_expression}})"></div>
the second:
<div ng-style="{backgroundImage: 'url({{example_expression}})'}"></div>
But when i change example_expression, only the first way can dynamically change the backgroundImage.
There is a example in Plunker
What's wrong with ngStyle?
ng-style should not contain {{}} interpolation directive, you could directly access scope variable there. Also backgroundImage should be 'background-image'
Markup
<div ng-style="{'background-image': 'url('+ example_expression+')'}"></div>
Demo Plunkr