How can I use getElementById in a Polymer custom element?
Here is my element:
<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="../styles/shared-styles.html">
<dom-module id="bb-calendar">
<template>
<style is="custom-style" include="shared-styles"></style>
<div class="card">
<paper-toolbar>
<div title>Calendar</div>
</paper-toolbar>
<div id="hideme">
<div>this should be hidden</div>
</div>
</div>
</template>
<script>
Polymer({
is: 'bb-calendar',
ready: function() {
document.getElementById("hideme").style.display = 'none';
}
});
</script>
</dom-module>
When I run the code I get this error message: Uncaught TypeError: Cannot read property 'style' of null
Obviously I'm doing something wrong but I don't know what.
I'd use
ready: function() {
this.$.hideme.style.display = 'none';
}
of when the element is inside <template dom-if...>
or <template dom-repeat...>
ready: function() {
this.$$('#hideme').style.display = 'none';
}
In the end, I'd use class binding and bind a class to the element and update a property to reflect that change and use CSS to set style.display
<template>
<style>
.hidden { display:none; }
</style>
...
<div class$="{{hiddenClass}}">
<div>this should be hidden</div>
</div>
Polymer({
is: 'bb-calendar',
properties: {
hiddenClass: String,
},
ready: function() {
this.hiddenClass = 'hidden';
}
});