如何从ejs将JSON数组对象传递给函数

Question

We have a Node.js application and when a user hits a certain route, a JSON array is fetched from an api(backend) and passed to my EJS template as an array object.

In the EJS template I have button which on click calls a Javascript function which does some computation on the JSON array object and displays the computed value on an html DIV element . I don't know how to send the JSON array object from the ejs template to the javascript function. I see a similar question posted in stackoverflow but i dont see any correct solution for that

The code for passing the JSON array object from node js router to ejs template looks like below . Here 'data' is the JSON array object sent to ejs file(gallery.ejs) using res.render()

app.get(“/getBill”, function(req, res) {


   bill(locationID,tableID, (error, billdata) => {
            if (error) {
                return console.log(error)
                res.render("error")
            }
            else {

                var data=billdata
                res.render("gallery",{data:billdata})
            }
        })


});

I can access the JSON array object 'data ' in my ejs file (gallery.ejs) and iterate through it and access the elements in the JSON array.

<% data.forEach(item => {%>
<div class="row ">
  <div class="col-lg-8 col-sm-8">
    <%=item.name%>
  </div>
  <div class="col-lg-4 col-sm-4 text-sm-right">
    $<%=item.price/100%>
  </div>

</div>
<%});%>

But I need to pass the JSON array object 'data' in the ejs file to a function on click of a button (see below). My goal is to access the JSON array object 'data' inside the function myFunction.

<button type="button" id="zeroperc" class="btn btn-outline-primary" onclick="myFunction()">0%</button>

How can I pass the JSON array object 'data' from ejs template to the function myFunction ()?

Answer 1

Simply add data to the function argument using ejs:

<button type="button" id="zeroperc" class="btn btn-outline-primary"
onclick="myFunction(<%=data%>)">0%</button>

Also, assuming data is actually json, you might need to call JSON.parse(data) from myFunction before you can access it's properties.

Update

Try this:

<script type="text/javascript">
var data = <%=data%>;
</script>

<button type="button" id="zeroperc" class="btn btn-outline-primary"
onclick="myFunction(data)">0%</button>