How To Create Vue.js Slot Programmatically?
{{ someProp }}
Solution 1:
I looked into TypeScript definition files of Vue.js and I found an undocumented function on Vue component instance: $createElement(). My guess is, it is the same function that is passed to render(createElement) function of the component. So, I am able to solve it as:
const Constr = Vue.extend(MyComponent);
const instance = new Constr({
propsData: { someProp: 'My Heading' }
});
// Creating simple slotconst node = instance.$createElement('div', ['Hello']);
instance.$slots.default = [node];
instance.$mount(body);
But this is clearly undocumented and hence questionable approach. I will not mark it answered if there is some better approach available.
Solution 2:
I think I have finally stumbled on a way to programmatically create a slot element. From what I can tell, the approach does not seem to work for functional components. I am not sure why.
If you are implementing your own render method for a component, you can programmatically create slots that you pass to child elements using the createElement method (or whatever you have aliased it to in the render method), and passing a data hash that includes { slot: NAME_OF_YOUR_SLOT } followed by the array of children within that slot.
For example:
Vue.config.productionTip = falseVue.config.devtools = false;
Vue.component('parent', {
render (createElement) {
returncreateElement('child', [
createElement('h1', { slot: 'parent-slot' }, 'Parent-provided Named Slot'),
createElement('h2', { slot: 'default' }, 'Parent-provided Default Slot')
])
}
})
Vue.component('child', {
template: '<div><slot name="parent-slot" /><slot /></div>'
})
newVue({
el: '#app',
template: '<parent />'
})<scriptsrc="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script><divid='app'></div>Solution 3:
(This doesn't really answer How to create Vue.js slot programatically?. But it does solve your problem.)
This trick is less hackish compared to using $createElement().
Basically, create a new component that register MyComponent as a local component.
const Constr = Vue.extend({
template: `
<MyComponent someProp="My Heading">
<div>slot here !!!</div>
</MyComponent>
`,
components: {
MyComponent: MyComponent
}
});
const instance = new Constr().$mount('#app');
Solution 4:
I just came across an answer to this in vue forum: slots
The principle is: There is nothing like createElement('slot'..) Instead there is a render function which provides the slotted innerHtml as function: $scopedSlots.default()
Usage:
render: function (createElement) {
const self = this;
returncreateElement("div", this.$scopedSlots.default());
}If you want to provide a default in case there is no content given for the slots, you need to code a disctinction yourself and render something else. (The link above holds a more detailed example)
The function returns an array, therefore it can not be used as a root for the render function. It need to be wrapped into single container node like div in the example above.
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