Polymer JS – template repeat does nothing with my array. (Chrome)

Question

This does nothing in my code..

<template repeat="{{item in list}}"> </template>

I have tried to also use as below but I get errors with this method:

<template is="dom-repeat" id="example" items="{{list}}"></template>

And i get the following errors with is="dom-repeat" :

Uncaught TypeError: Polymer.dom.addDebouncer is not a function
Uncaught TypeError: Polymer.dom is not a function

Why?

Here is my code

<link rel="import" href="../lib/iron-ajax/iron-ajax.html">

<link rel="import" href="../lib/polymer/polymer.html">

<link rel="import" href="welcome-title.html">

<dom-module id="remove-user">

<template>
  <iron-ajax id="getAll" url="http://localhost:3002/secure/api/all" method="GET" handle-as="json" on-response="getAllCB" with-credentials='true'></iron-ajax>

    <div class="ui relaxed stackable grid centered" id="admin-container">
        <welcome-title class="ui center aligned row grid"></welcome-title>
        <form class="ui grid remove-user hide twelve wide column" method='post' action="/secure/add-user">
            <h3>Remove User</h3>

            <table class="ui unstackable celled table ">
                <thead>
                    <tr><th class="nine wide">Username</th>
                        <th class="three wide">Permission</th>
                        <th class="one wide"></th>
                    </tr>
                </thead>
                <tbody> ...

Here is where I am confused. I have simplified the loop to make it easier to debug but it doesn't appear. Although any text outside of the template repeat appears. There are no errors in the console.

                    <template repeat="{{user in users}}">
                        <span>{{user}}</span>
                    </template>

Why does nothing inside the repeat not show up on my page?

                    ... <tr>
                        <td><span></span></td>
                        <td></td>
                        <td class="collapsing">
                            <div class="ui fitted checkbox">
                                <input type="checkbox"> <label></label>
                            </div>
                        </td>
                    </tr>

                </tbody>
                <tfoot class="full-width">

                    <tr><th colspan="3">

                        <button class="right floated negative ui button"><i class="remove user icon"></i>Remove User(s)</button>
                    </th>
                </tr></tfoot>
            </table>
        </form>
    </div>

</template>



</dom-module>
<script>

Polymer({

    is: "remove-user",

    ready: function(){

        this.$.getAll.generateRequest();

    },

    getAllCB: function(data){

        this.users = data.detail.response;
    }

});

</script>

The users JSON object looks like this when outputting to browser console using JSON.stringify():

[{"username":"admin","permission":"admin"},            
{"username":"admin","permission":"application1"},
{"username":"user","permission":"application1"},
{"username":"test","permission":"application1"}]

Access to the complete project: The file in question is under authentication/public/elements/remove-user.html The main page that loads this elements is authentication/secure.html https://github.com/CoultonF/Web-Development-3-Node.JS

Answer 1

It looks like you're attempting to use an expression inside a data binding, which Polymer 1.x does not support (nor is it on the roadmap for 2.x).

The correct form of this code:

<template repeat="{{user in users}}">
  <span>{{user}}</span>
</template>

is this:

<template is="dom-repeat" items="{{users}}" as="user">
  <span>{{user}}</span>
</template>

 HTMLImports.whenReady(() => { Polymer({ is: 'x-foo', properties: { users: { type: Array, value: () => ['Andy', 'Bob', 'Charlie'] } } }); });

 <head> <base href="https://polygit.org/polymer+1.7.1/components/"> <script src="webcomponentsjs/webcomponents-lite.min.js"></script> <link rel="import" href="polymer/polymer.html"> </head> <body> <x-foo></x-foo> <dom-module id="x-foo"> <template> <template is="dom-repeat" items="{{users}}" as="user"> <span>{{user}}</span> </template> </template> </dom-module> </body>

codepen

You can read more about the dom-repeat template in the Polymer docs .

Polymer JS – template repeat does nothing with my array. (Chrome)

Question

1 answers

solution1
0 ACCPTED 2017-02-27 06:09:44

Polymer JS – template repeat does nothing with my array. (Chrome)

Question

1 answers

solution1 0 ACCPTED 2017-02-27 06:09:44

solution1
0 ACCPTED 2017-02-27 06:09:44