I need to pass vue-component in vue-cytoscape node-graph as element. See code example below:
<cytoscape :config="config">
<cy-element
v-for="def in elements"
:key="`${def.data.id}`"
:definition="<VUE-COMPONENT></VUE-COMPONENT>" // but if i make it like that, it wouldn't work
/>
</cytoscape>
Tell me please,if it's possible, thank you.
Related
Fairly basic question as I'm going back to webdev after a few years away so experimenting.
I want to create a reusable component that wraps an error message in a formatted element:
I'd call it in my partial as...
<x-error :blah="$woof"/>
The component code would be something like this:
#error('field') "nicely formatted message" #enderror
However, I want to be able to dynamically set the field name within for the error directive, something like:
#error($field) or #error({{ $field }}) "nicely formatted message" #enderror
...while in the executing partial it would be called through something like:
<x-error :field='email'> or <x-error :field='password'> or <x-error :field='description'> or whatever field name you like.
After spending way too long trawling the web for clues I'm starting to suspect this isn't possible.
Is it? If so how do you do it? Any help or clues gratefully received
Cheers!
The answer is embarrassingly simple: leave off the semicolon! The semicolon kinda acts like a pointer to a variable, rather than passing the data directly to the component, so instead of:
<x-error :field="$title" />
It should be :
<x-error field="title" />
In the component you merely call the variable name:
#error($field)
"nicely formatted message"
#enderror
Easy, init?
In _createElement, I want to ask whether data.is is same to the v-bind:is?
https://github.com/vuejs/vue/blob/0baa129d4cad44cf1847b0eaf07e95d4c71ab494/src/core/vdom/create-element.js#L64
Why tag = data.is?
Thanks for every respondent!
As the comment in the code suggests, that line is specifically to handle the case where is is included inside an object v-bind. e.g.:
<component v-bind="{ is: 'button' }">Button</component>
You can see this for yourself by setting a breakpoint in your browser on that line. I'm using Webpack and Chrome and the relevant file appears under webpack:///./node_modules/vue/dist/vue.esm.js in the Sources tab. Quick search for _createElement and click in the margin to set a breakpoint.
In the example above the is value is intended to be used as the tag, whereas component is just a dummy tag that can be discarded.
The syntax above is equivalent to:
<component is="button">Button</component>
or:
<button>Button</button>
However, neither of these two examples will go into the relevant if section. In these other two cases the tag is already resolved correctly prior to this point.
I have a simple component which is rendered by a click function, but it gets rendered twice, this is my code.
<SeeCompany
:is="create"
v-bind:companyId="companySelected"
#closeChild="closeModule"
/>
when i clicked in the button i change the create value to 'SeeCompany' so it gets mounted, but it repeats the same component text twice on the screen.
<b-button block
#click="create = 'SeeCompany'"
class="m-sides"
variant="outline-primary">
Ver
</b-button>
here is the image:
EDIT: Here is the code in the mounted
export default class SeeCompany extends Vue {
#Prop({ default: 0 }) private companyId !: number;
constructor() {
super();
}
private mounted() {
console.log(this.companyId); --> This is consoling two ceros (0) and the passed value for instance = 1;
}
}
There are two main uses for is.
Working around limitations in in-DOM templates.
Dynamic components.
For more information see https://v2.vuejs.org/v2/api/#is.
We can ignore the former case as it isn't relevant here.
Typically the second case looks a bit like this:
<component :is="childName" />
Here childName is a property of the component and determines the name of the child component to use. In your example you called it create.
The actual tag name used in the template doesn't really matter. It is common to use the dummy tag <component> for this purpose to avoid misleading future maintainers who may not immediately notice the :is. Whenever you see <component> you know you're in a dynamic component scenario.
When we talk about dynamic components it is important to appreciate exactly what we mean by 'dynamic' in this context. We are specifically talking about which component to use. We are not talking about determining whether or not to create the component in the first place.
In the code in the question the value of create is initially set to an empty string, ''. This is then passed to :is. If you inspect the DOM you'll find that this creates a comment node. While this does make some sense I am unclear if this is officially supported. I've not seen this behaviour documented anywhere and I suspect you may be getting lucky by falling down an internal code path that's intended for other things. It is not something I would be confident relying on in future versions of Vue.
The specific code of interest is:
<SeeCompany
v-bind:is="create"
v-bind:companyId="1"
/>
<SeeOther
v-bind:is="create"
v-bind:companyId="1"
/>
So if you inspect the DOM when create is '' you should find two comment nodes.
When create gets set to SeeCompany this is equivalent to:
<SeeCompany
is="SeeCompany"
v-bind:companyId="1"
/>
<SeeOther
is="SeeCompany"
v-bind:companyId="1"
/>
In turn this is equivalent to:
<SeeCompany
v-bind:companyId="1"
/>
<SeeCompany
v-bind:companyId="1"
/>
The result is the creation of two SeeCompany components. The original SeeOther tag is irrelevant here. This is why, as noted earlier, the convention exists to use a <component> tag to avoid being misleading.
Of course this isn't what you actually wanted the code to do. I'm unclear what the target behaviour is so I'm going to cover a few variations.
If you just want to show the components conditionally you'd use v-if instead:
<SeeCompany
v-if="create"
v-bind:companyId="1"
/>
<SeeOther
v-if="create"
v-bind:companyId="1"
/>
Usually you'd want create to be a proper boolean, false or true. So set the initial value to false with #click="create = true".
Of course this would show both SeeCompany and SeeOther at the same time. That may not be what you want either. Perhaps you only want to show one at once. For that you might do something like this:
<SeeCompany
v-if="create === 'SeeCompany'"
v-bind:companyId="1"
/>
<SeeOther
v-if="create === 'SeeOther'"
v-bind:companyId="1"
/>
Here the initial value of create should be a falsey value of some kind, possibly '', with #click="create = 'SeeCompany'" and #click="create = 'SeeOther'" on appropriate buttons.
If the props for the components are all the same, and especially if there are more than two components involved, you could try to simplify this using is:
<component
:is="create"
v-if="create"
v-bind:companyId="1"
/>
This is shorter but arguably not as clear.
I am trying to automate test case using Protractor and Jasmine. The problem is I have an "article" web element tag that gets created at runtime and this web-element has a as sub element. This div element has a "id" tag associated with it. The structure of the code is below.
<article class="a b c d" data-ng-repeat="xyz repeat">
<div id="THIS IS WHAT I WANT" class="class name">
</article>
Now I am able to get get hold of the article web-element. but I am not able to get the ID attribute in the div. The ID values is generated dynamically. Kindly suggest how I can get the ID value.
Thank you
You can use a CSS Selector like this:
article > div
This will get you a div inside of an article. Now you can use this to play around and specify the selector further with classes or other stuff.
If you managed to get the div element you can then pull out the idea using (not sure if the syntax is correct but you should get the idea):
element.getAttribute('id')
1) element(by.xpath(//div[#class='class name'])).getAttribute('id')
2) element(by.xpath(//article [#class='abcd']//div[#id='THIS IS WHAT I WANT'])).getAttribute('id')
You can use chains like this:
element(by.classname('')).element(by.className('classname'));
or
element(by.css('css of parent')).element(by.css('child css'));
or you can use element(by.repeater('repeat in reapeats')).element(by.css(''));
I would like to change the href attributes of the link tags that have the following attribute :
rel="apple-touch-icon-precomposed"
Does anyone know how to achieve that ?
Thank you
Ext.select can be used to search for DOM elements. To understand how to select elements in the DOM, one may have a look at jQuery Selectors documentation.
Ext.dom.Element.set can then be used to change the href attribute. Note that even if Ext.select returns a collection, all methods of Ext.Element can be used on the collection.
In short, this gives something like this:
Ext.select("a[rel='apple-touch-icon-precomposed']").set({href: 'my-other-link.html'});