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Reactive page elements with Vue.js for oTree


This repo demonstrates the use of Vue.js to automatically update page elements in reaction to data received via the live send functionality of oTree 3.0.x.

Vue.js allows us to access Javascript variables using special tags. Variables included on a page using these tags automatically update when their values change. Combined with oTree's live send feature, we can automatically update any variables on a page without having to write tedious and repetitive code. This is especially useful when variables need to be updated repeatedly and in more than one place.

Note: Normally, the special tags used by Vue.js are {{ varname }}, which clashes with Django template tags of the same format. Thus, I configured Vue.js to use [[ varname ]] instead.


A live demo is available here. I recommend opening the demo session in split screen mode to see it in action.


Include two small scripts in the {% block scipts %} section of the live page template. Then continue to implement your live sending functions as usual.

<script src=""></script>
<script type="text/javascript">
    var live_data_received = {live_data: {}};
    liveSocket.onmessage = function (e) {
        live_data_received["live_data"] = JSON.parse(;

    new Vue({
        data: live_data_received,
        el: '._otree-content',
        delimiters: ["[[","]]"]

Note: This assumes that the live send method on the Group model returns a dictionary ({"key": "value"}). Elements of this dictionary can then be accessed on the page by using [[ live_data.key ]].


Combining Vue.js and oTree's (3.x) live send functions.