Consider the following code, where <my-item>
always has a fixed width of 200px
inside <iron-list grid>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Polymer Element Test Case</title>
<!-- Load webcomponents-loader.js to check and load any polyfills your browser needs -->
<script src="bower_components/webcomponentsjs/webcomponents-loader.js"></script>
<link rel="import" href="bower_components/polymer/polymer-element.html">
<link rel="import" href="bower_components/iron-list/iron-list.html">
</head>
<body>
<h1>iron-list-grid-calc-issue</h1>
<!-- Test case HTML goes here -->
<test-case>
</test-case>
<dom-module id="test-case">
<template>
<iron-list items="[[items]]" grid>
<template>
<div>
<!-- value: [[item.n]] -->
<my-item data="[[item]]"></my-item>
</div>
</template>
</iron-list>
</template>
</dom-module>
<dom-module id="my-item">
<template>
<style>
.content {
width: calc(50% - 32px); /* Not working */
width: 200px;
height: 200px;
line-height: 200px;
text-align: center;
border: 1px solid grey;
box-sizing: border-box;
}
</style>
<div class="container">
<div class="content">
data: [[data.n]]
</div>
</div>
</template>
</dom-module>
<script>
window.addEventListener('WebComponentsReady', function() {
class TestCase extends Polymer.Element {
static get is() {
return 'test-case';
}
static get properties() {
return {
items: {
type: Array,
value: function() {
let items = [];
for (let i=0; i < 10; i++) {
items.push({
n: i,
});
}
return items;
}
},
};
}
}
class MyItem extends Polymer.Element {
static get is() {
return 'my-item';
}
static get properties() {
return {
data: Object,
};
}
}
window.customElements.define(TestCase.is, TestCase);
window.customElements.define(MyItem.is, MyItem);
});
</script>
</body>
</html>
I intend to make <my-item>
responsive by always showing 2 <my-item>
s per row (which can be stretched) by setting the width of <my-item>
with width: calc(50% - 32px)
. I noticed CSS calc()
doesn't seem to work as expected.
How do I set the responsive width of a Polymer component inside <iron-list grid>
?
Set the size of the item template's root container element ( <div>
in this case).
<iron-list items="[[items]]" grid>
<template>
<div style="width: calc(50% - 32px); height: 200px"> <!-- root container element -->
<my-item data="[[item]]"></my-item>
</div>
</template>
</iron-list>
<head> <base href="https://polygit.org/polymer+v2.3.1/components/"> <script src="webcomponentsjs/webcomponents-loader.js"></script> <link rel="import" href="polymer/polymer.html"> <link rel="import" href="iron-list/iron-list.html"> </head> <body> <h1>iron-list-grid-calc-issue</h1> <test-case></test-case> <dom-module id="test-case"> <template> <style> .item { width: calc(50% - 32px); height: 200px; } </style> <iron-list items="[[items]]" grid> <template> <!-- Set the size of the item template's root container, which is this `div` element. --> <div class="item"> <my-item data="[[item]]"></my-item> </div> </template> </iron-list> </template> </dom-module> <dom-module id="my-item"> <template> <style> .content { /* NOTE: The item size is set in the item template in `iron-list` */ /*width: calc(50% - 32px);*/ /*width: 200px;*/ /*height: 200px;*/ line-height: 200px; text-align: center; border: 1px solid grey; box-sizing: border-box; } </style> <div class="container"> <div class="content"> data: [[data.n]] </div> </div> </template> </dom-module> <script> window.addEventListener('WebComponentsReady', function() { class TestCase extends Polymer.Element { static get is() { return 'test-case'; } static get properties() { return { items: { type: Array, value: function() { let items = []; for (let i=0; i < 10; i++) { items.push({ n: i, }); } return items; } }, }; } } class MyItem extends Polymer.Element { static get is() { return 'my-item'; } static get properties() { return { data: Object, }; } } window.customElements.define(TestCase.is, TestCase); window.customElements.define(MyItem.is, MyItem); }); </script> </body>
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