My problem is the following:
I need to render a bunch of Tableau graphs on a page.
I am currently calling them in tableau-graphs component as follows:
TableauGraphs Component
<template>
...
<tableau-graph
v-if="urls.length > 0"
v-for="(chartUrl, index) in urls"
:src="getVizUrl(chartUrl, ticketList[index])"
/>
...
</template>
When I do this, all the charts are called immediately one after another, and tableau decides the order in which they are loaded. This behaviour is undesired because there might be many graphs and tableau can decide to load a graph much further down on the screen before the first one.
I want to try to do the following:
make tableau-graph component emit a ready event once its loaded.
the parent tableau-graphs listen to that event and load the next chart in urls.
repeat 1-2 until there are no more charts to load.
I have gotten the child component to emit a custom event and listen to it. However, I have not been able to programmatically add a new component in the template. I have tried using h function but I am unsure how to mix it with a regular template syntax.
So, my questions are:
How do I programmatically add an existing Vue component to another in script setup?
Is this a desirable way to go about solving this issue, or is there more elegant way to solve this problem? (For example, using Async Components and/or Suspense)
Related
I am developing a Vue3 application with a component that renders a D3 chart.
The problem occurs when I navigate to another page and get back to the same D3 component but with different data. The D3 charts keep on getting stacked on each other.
I am using Vue3 and found it is a bit difficult to disable caching of components but perhaps I missed some options. I wouldn't mind disabling caching completely, because most of the data is obtained from localStorage, so pretty quick anyway
Here is a sandbox to illustrate the problem:
https://codesandbox.io/s/vue-3-vuex-4-vue-router-forked-eem3ui?file=/src/components/Miserables.vue
If you click on the "Miserables" link, then to another link (Playerlist or About) and back to Miserables, you'll see the charts stacked.
You have at least 2 "smells" in your code:
you are creating and injecting <script> tags every time your Miserables component is being mounted - after multiple mountings you will have a lot of duplicate JavaScript code, pontentially poluting the global namespace (multiple times) and worse - potentially attaching multiple event handlers or setting up timers;
on every mounting you are creating a new SVG and appending it to the BODY - so it's not Vue's fault that you're getting multiple SVGs on the page;
I'm writing an app in Vue and I have a really hard time understanding the component hierarchy, namely the parent-child relationships and how to pass data around.
I have a view that contains a map which in turn has some navigation controls and options that are overlayed on top of the map. Now, I want these controls to manipulate the map WITHOUT having to nest the buttons inside the actual maps as it will cause severe display issues (for example, clicking on a zoom button falls through the button and also clicks the next element under it).
My app looks like this:
Mapview
Map
Controls
Options
Optionpanel1
Optionpanel2
...
Now, a HTML input element in Optionpanel1 needs to control something in the Map, which is not actually it's parent component. Also, some data from Map needs to be passed down to Optionpanel1 so it would know what to control. To make matters worse, something in Options also needs to pass something down to Optionpanel1, so, even though event bus would allow communication upwards, it would not solve that I need to pass data from parents to indirect children and also components that are not it's children.
I can actually pass the required property down the line if I nest the Options inside Map and pass it down with :myProp="prop" and then in Options, declare it in props and bind to Optionpanel1, where it is again declared as a prop. But as I mentioned earlier, nesting elements that I do not want to be nested in a visual sense causes massive issues like mouse click falling through. Do elements even need to be nested inside eachother in order to define parent-child relationship?
I would want components to exchange read-only data without Y being a child of X in the DOM. Also, even if nesting components like this would not cause visual issues, does it not seem very annoying to have to register and bind it in every component along the way?
I don't understand why is it so difficult to simply read something from another component. It's starting to seem that Vue is causing a problem that it's supposed to solve? Am I missing something here or am I looking at this in a completely wrong way?
Thanks in advance.
Basically you have 2 options to control complex components:
Handle the actions in your so-called "smart component" (in terms of React), which is the common ancestor for the controlling and controlled components. It's a pretty good solution for small components, but that's not the case.
To separate common logic and data in a Vuex store. I'd recommend you doing this.
I have to code a web application and the most important element is the q-tree. I'm already able to load and show data (passing an array called list), but I want that all nodes are expanded.
The vue.js examples of the official documentation show that you're be able to do this with the 'default-expand-all' attribute but this isn't working for me.
It only shows me the root node with an arrow, where I have to expand the children nodes manually.
<q-tree
:nodes="list"
:selected.sync="selected"
#update:selected="onSelectionChangedNode"
node-key="NodeNr"
label-key="NodeTxt"
default-expand-all
></q-tree>
Taking a cue from the accepted answer, I realised that the dom has already been created with the tree component on first render.
In my use case, I want to update the Tree when data comes back from the server.
So, I had to force it to re-render with the expanded functionality using:
this.$nextTick(function () {
this.$refs.nodes.expandAll();
})
The nextTick function will update the dom in the next window of execution, by which time the nodes will get expanded by calling the expandAll function.
And NB: For those confused by the astericks on the ref attribute or how to add it to the component, here goes:
<q-tree :nodes="list"
:selected.sync="selected"
#update:selected="onSelectionChangedNode"
node-key="NodeNr"
label-key="NodeTxt"
ref="nodes"
>
Solved my problem as following:
I have added a ref attribute to the QTree DOM Element which makes it possible to access predefined methods of QTree API.
<q-tree
:nodes="list"
:selected.sync="selected"
#update:selected="onSelectionChangedNode"
node-key="NodeNr"
label-key="NodeTxt"
**ref="nodes"**
>
The function I have been using is expandAll().
updated() {
this.$refs.nodes.expandAll();
}
The most important thing for me was, I had to find out which lifecycle hook was the right one for me. The update() hook was the one I was looking for.
The reason:
Called after a data change causes the virtual DOM to be re-rendered and
patched.
The component’s DOM will have been updated when this hook is called, so you
can perform DOM-dependent operations here.
The default-expand-all is only applied on the first rendering of that Component.
So if your Component renders when the nodes aren't assigned they wont expand if assigned afterwards.
https://v1.quasar-framework.org/vue-components/tree
You have to work with scoped slots and an expanded attribute if you dont have the nodes on first rendering.
I am currently developing a web application that is used to display elements for events on a map provided by HERE Maps. I am using Vue.
I have some components, but the relevant component is the component HereMaps.vue which initializes the map using the HERE Maps Api.
The HERE Maps Api provides the possibility to place so called InfoBubbles on the map showing additional information. These InfoBubbles can be provided some HTML-code in order to customize their appearance.
Please refer to the documentation for additional information
Following the documentation the code looks something like this:
let bubble = new H.ui.InfoBubble(marker.getPosition(), {
content: "<div class='someClass'>Some Content</div>"
});
this.ui.addBubble(bubble)
This is happening after mount in the "mounted" method from Vue in the "HereMaps" component.
The Bubbles are added in a "closed" (hidden) form and dynamically "opened" to reveal their content when the corresponding marker icon on the map is clicked. Therefore the HTML-code is present on the DOM after the component is mounted and is not removed at a later stage.
Now instead of supplying custom code within each bubble added to the UI i want to just add a component like this:
let bubble = new H.ui.InfoBubble(marker.getPosition(), {
content: "<myDynamicComponent></myDynamicComponent>"
});
this.ui.addBubble(bubble)
It does not matter to me wether the component is initialized using props or if it is conditionally rendered depending on the state of a global variable. I just want to be able to use the "myDynamicComponent" in order to customize the appearance in a different file. Otherwise the design process gets very messy.
As far as i know this is not possible or at least i was not able to get it work. This is probably due to the fact that the "myDynamicComponent" is not used within the "template" of the "HereMaps" component und thus Vue does not know that it needs to render something here after the directive is added to the DOM in the "mounted" method.
This is what the InfoBubble looks using normal HTML as an argument:
This is what the InfoBubble looks using the component as an argument:
It appears to just be empty. No content of the "myDynamicComponent" is shown.
Does anyone have any idea how i could solve this problem.
Thank You.
Answer is a bit complicated and I bet you wouldn't like it:)
content param can accept String or Node value. So you can make new Vue with rendered your component and pass root element as content param.
BTW, Vue does not work as you think, <myDynamicComponent></myDynamicComponent> bindings, etc exists in HTML only in compile time. After that all custom elements(components) are compiled to render functions. So you can't use your components in that way.
Give us fiddle with your problem, so we can provide working example:)
I was Vue.js now for a project and created and used a lot of components.
Now I started to have the problem of having too many eventemitters and props that I need to keep track of.
I guess to illustrate the problem the best I will use an example:
Lets say you have a main.vue and 2 or 3 Components.
One contains a button that should manipulate the other 2 components or switch them out.
Now I need to emit an event to the main.vue and then main.vue has to change a binded variable and pass props down to the other 2 components.
Alright: Now lets put the button in a component of of a component. You need to make sure that every link between a parent and a child is correct.
Now create a bit project and put a button in another components and you have to change everything.
So is there a good way to avoid this?
Something like a broadcast function so that every component is receiving the event?
Or a Manager that is handling the communication of all components?
use a flux pattern (vuex)
At first you may think that this does not really answer the question, since it deals with storage of data, and not handling of events. The flux pattern changes the architecture of your application by creating a single store (think database) that all components can read and write from. Coupled with the reactive nature of the reactive frameworks such as vue (or react), the components will react to a change in data. So instead of tightly coupling component A to D through B and C, you'd have component A listen to mutations in object X, and component D makes changes to object X. When the change happens, component A gets updated without having to listen to any of the children's $emit functions firing. At first it may seem daunting, but the investment is worthwhile.