I'm trying to create dropdown select (appearing if radio button is selected) in Polymer, that triggers another dropdown select on-iron-select.
All of this lives within a parent template:
<dom-module id="likes-cars">
<template id="maintemplate">
<paper-radio-button checked="{{likesCars}}" id="thebutton">I like cars.</paper-radio-button>
<template is="dom-if" if="{{likesCars}}">
<paper-dropdown-menu label="Your favourite car make">
<paper-menu class="dropdown-content" on-iron-select="modelfunc">
<paper-item>Make 1</paper-item>
<paper-item>Make 2</paper-item>
</paper-menu>
</paper-dropdown-menu>
</template>
<template id="menutemp">
<paper-dropdown-menu label="Your favourite car model">
<paper-menu class="dropdown-content" >
<template is="dom-repeat" items="{{models}}"id="modelstemplate" >
<paper-item>{{item}}</paper-item>
</template>
</paper-menu>
</paper-dropdown-menu>
</template>
</template>
And my Polymer script once the iron-select occurs is:
<script>
Polymer({
is:"likes-cars",
modelfunc: function() {
this.$.menutemp.model={}
this.$.modelstemplate.model={models:["Model 1","Model 2"]}
}
});
</script>
This results in the error:
Uncaught TypeError: Cannot set property 'model' of undefined
What is the best way to select and model "modelstemplate" with an array passed in?
Do I need to model the template around it("menutemp") separately?
I think you're misunderstanding how Polymer's data binding works a bit.
When you bind to something using the [[property]] or the {{property}} notation in a custom element, you're binding to the custom element's properties, no matter if you actually define the properties when calling the Polymer() function.
So when you say your dom-if and your paper-radio-button are bound to likesCars and that the dom-repeat is bound to models they're bound to this.likesCars and this.models.
So all you need to do in your modelfunc function is to set this.models to an array of Strings you want to show as items for the second menu. With this considered, the template enveloping the second menu is actually unnecessary.
Here's a jsbin with a working example based on your code, I added a selectedMake property too so that you can actually set different arrays to the second menu depending on what was selected on the first menu.
I hope this helped
Related
I've got a child component (that I cannot edit) where each row in an object is rendered inside a div with a specific slot, and I'd need to pass data from the parent for each of those elements. I'm trying to iterate through every element of the object in the parent component, generate a slot and pass the desired code to the child, but unfortunately I can't manage to and I can't find any material to support me.
The child component:
<div class="slotchildren" v-for="(child, childindex) in row.elementChildren" :key="childindex">
<span>element nr. {{child.id}}</span>
<slot :name="`element-child-${row[idlabel]}-${childindex}`" :row="child">
...
</slot>
</div>
The parent component (not working):
<template v-for="row in rows"> -->
<template v-slot:`element-row-${row.id}`="{row}">
//--> [vue/valid-v-slot] 'v-slot' directive doesn't support any modifier
//--> [vue/valid-v-slot] 'v-slot' directive must be owned by a custom element, but 'template' is not.
<span>{{row.name}}</span>
</template>
</template>
Is something like this feasible and how? If it's not, what could be a viable workaround, consideind that I can't edit the child component?
Thanks in advance.
I solved it with the following synthax:
<template v-for="row in rows" v-slot:[`element-row-${row.id}`]>
..
</template>
So I have a scenario:
<template is="dom-repeat" items="{{objects}}" as="o" filter="{{_filter(filter)}}">
...
<template is="dom-if" if="_isHidden" restamp>
foo
</template>
...
</template>
Now, the _filter function forces rerendering items under the dom-repeat every time my filter property changes (since it's observed by _filter. This is not the problem as it works properly, but the catch is that the _hidden function might return true or false based on another property (which could also change), and whenever the filter rerenders I need to force re-evaluation of _isHidden hence hide or show the contents of the dom-if template.
Anyone has an idea what could be my issue?
Thanks!
You have to also bind the _isHidden property:
<template is="dom-repeat" items="{{objects}}" as="o" filter="{{_filter(filter)}}">
...
<template is="dom-if" if="{{_isHidden}}" restamp>
foo
</template>
...
</template>
I tried adding it with like dropdownMenu.appendChild(menuItem) but as I expected this doesn't work. I couldn't find information about this on Polymer's guides nor other similar questions on here.
Is that possible? If so, how?
paper-dropdown-menu: https://elements.polymer-project.org/elements/paper-dropdown-menu
In Polymer, recommended way of manipulating the DOM is by manipulating the data:
put the list of menu items in array: var items_array = [....];
-create the menu as:
<paper-dropdown-menu label="Your favourite pastry">
<paper-listbox class="dropdown-content">
<template is="dom-repeat" items="{{items_array}}">
<paper-item>{{item}}</paper-item>
</template>
</paper-listbox>
</paper-dropdown-menu>
adding and removing elements in items_array will affect the menu immediately.
Found out the proper way from their docs:
Should select the Polymer element with: Polymer.dom(parent).querySelector(selector)
And append with: Polymer.dom(parent).appendChild(node)
<template id="repeat" is="dom-repeat" items="[[model]]" as="day">
<component model="[[day]]"></component>
</template>
I am using iron local storage to load data as the [[model]].
When the data is updated using localStorage.setItem(...), how can I have the template to update and display the newly added object?
Right now the new object only displays after a page refresh, because it will reload the local storage.
I tried using this.$.repeat.render() as said by another stackoverflow post but that did nothing.
That pattern I would use would be:
<template>
<iron-localstorage name="my-app-storage" value="{{model}}" on-iron-localstorage-load-empty="initializeDefaultValue"></iron-localstorage>
<template id="repeat" is="dom-repeat" items="[[model]]" as="day">
<component model="[[day]]"></component>
</template>
</template>
And then when you want to update localstorage, just update the object because:
iron-localstorage automatically saves the value to localStorage when value is changed. Note that if value is an object auto-save will be triggered only when value is a different instance.
this.set('model', model);
I am using Polymer 1.0 and I am building a small accordion example. I have data binding to the accordion text fine, I just want to change the icon of the accordion when I click it.
Below is my code
<dom-module id="ab-accordion">
<template>
<iron-ajax
auto
handle-as="json"
on-response="handleResponse"
debounce-duration="300"
id="ajaxreq"></iron-ajax>
<template is="dom-repeat" id="accordion" items="{{items}}" as="item">
<div class="accordion" on-click="toggleParentAcc">
<div id="accordion_header" class="accordion__header is-collapsed">
<i class="icon icon--chevron-down"></i>
<span>{{item.name}}</span>
</div>
<div id="standard_accordion_body" class="accordion__body can-collapse">
<div class="accordion__content">
<content id="content"></content>
</div>
</div>
</div>
</template>
</template>
<script>
Polymer({
is: "ab-accordion",
//Properties for the Element
properties: {
accordian: Object,
childaccordions: Object,
// Param passed in from the element - Set if the accordion is open by default.
open: String,
data: String,
reqUrl: {
type: String,
value: "https://example.com/service.aspx"
},
},
ready: function () {
this.items = [];
},
attached: function () {
// Run once the element is attached to the DOM.
},
toggleParentAcc: function (event) { // Toggle the classes of the accordions
//This is where I want to toggle the class
this.$.accordion_header.classList.toggle('is-collapsed');
if (typeof event !== 'undefined') {
event.stopPropagation(); // Stop the click from going up to the parent.
}
},
handleResponse: function (e) {
this.items = e.detail.response.sports;
}
});
</script>
</dom-module>
Basically inside the toggleParentAcc function I want to toggle the class of the div with ID accordion_header. But I just get undefined or null.
I have tried the following two lines:
this.$.accordion_header // #1
this.$$('#accordion_header') // #2
How I access that element inside the dom-repeat?
UPDATE: I can't even access the elements within the when inside the attached function.
attached: function(){
this.$.accordion_header // This is null?!
this.$$('#accordion_header'); // this is also null!
}
https://www.polymer-project.org/1.0/docs/devguide/local-dom.html#node-finding
Note: Nodes created dynamically using data binding (including those in dom-repeat and dom-if templates) are not added to the this.$ hash. The hash includes only statically created local DOM nodes (that is, the nodes defined in the element’s outermost template).
I think it would be better if you'd use Polymer.dom(this.root) instead. Also I'd advice you to not use static IDs in dom-repeat as they are meant to be unique. Use classes instead.
Looks like you might be encountering Event Retargeting which happens when events "bubble" their way up the DOM tree. Read this documentation to learn more.
When I encountered this, I solved it by using something like:
var bar = Polymer.dom(event).path[2].getAttribute('data-foo');
inside my Polymer() function.
To figure it out in your case, you should go to the console and search the DOM tree / event log to locate your target. If you have trouble locating the correct area of the console, post a comment and I might be able to help further.
I eventually figured out a way of doing this without having to select elements in the nested template.
<template id="accord_template" is="dom-repeat" items="{{items}}" as="item">
<ab-accordion-row id="[[item.id]]" name="[[item.name]]" open="[[item.open]]">
</ab-accordion-row>
</template>
ab-accordion is another element, I just feed it the data and I can then change the classes based on the params.
<div id="accordion" class="accordion" on-click="toggleAccordion">
<div class$="{{getClassAccordionHeader(open)}}">
<i class="icon icon--chevron-down"></i>
<span>{{name}}</span>
</div>
<div id="standard_accordion_body" class$="{{getClassAccordionChild(open)}}">
<div class="accordion__content">
<content></content>
</div>
</div>
</div>
try with this.
toggleParentAcc: function (event) { // Toggle the classes of the accordions
//This is where I want to toggle the class
var header = event.target.parentElement;
Polymer.dom(header).classList.toggle('is-collapsed');
// rest of your code
}