Onclick-function on elements in Handlebars-template

问题

I'm building a simple webapp with just Handlebars.js and some jQuery.

Now I have a list of data, and i present them through a Handlebars-template. Then I want some actions associated with these, e.g. update one element, or delete one. I have buttons that one associates with these actions, the problem is that I cannot manage to get onclick-methods associated with buttons in the template to work.

I read this question and answer, which lead me to adding the extra bracket and helpermethod, but it still doesn't work. See code below.

Handlebars.registerHelper('json', function(context) {
    return JSON.stringify(context);
});

var myGreatFunction = function(someValue) {
    // Work with that value 
}

The template:

{{#each Something}}
    <button onclick="myGreatFunction({{{json this}}})"></button>
{{/each}}

Now, doing it like this give me Uncaught SyntaxError: missing ) after argument list at the top of the HTML-file.

I noted the answer here, so I tried with onclick="myGreatFunction( '{{{json this}}}' )" which gives me the error Uncaught SyntaxError: Unexpected token ILLEGAL at the end of HTML-file.

With onclick="myGreatFunction( '{{json this}}' )" the button simply disappears on click.

Does anyone see something I've missed, or is there another way of doing this? I thought of adding the object to some div/button in the template, then add a jQuery-listener for the click that fetches the value from the template, but that seems so ugly and unclear.

Any tips? All help is greatly appreciated - thanks in advance.

UPDATE: Seems the problem is, as Hacketo mentioned below, that the outputted JSON is kind of messed up. I inspected an element in my code:

onclick="someFunc('{"id":5,"publisher":null,"message":" asdadsad","address":"asdad","published":&quot
Last Saturday at 12:00 AM","createdAt":"2015-07
23T09:55:35.486Z","updatedAt":"2015-07-23T09:55:35.486Z"}')"

(Broken over multiple lines for your convenience).

Now I just have to find out of to get that JSON to look right.

回答1:

This is because JSON.stringify return a JSON string and contains ".

At the moment, your template may look like this:

<button onclick="myGreatFunction({{{json this}}})"></button>

Compiled :

<button onclick="myGreatFunction({"foo":"bar"})"></button>
                ^                 ^   ^ ^   ^  ^

And this result as

Uncaught SyntaxError: missing ) after argument list

---

You need to escape those " and you can do this in your helper

Handlebars.registerHelper('json', function(context) {
    return JSON.stringify(context).replace(/"/g, '"');
});

And this will result as

<button onclick="myGreatFunction({&quot;foo&quot;:&quot;bar&quot;})"></button>

回答2:

Just take out the extra bracket. If you let Handlebars do HTML escaping (which it will automatically on a regular {{json this}} invocation), it will also escape the quotes for you.

来源：https://stackoverflow.com/questions/31591020/onclick-function-on-elements-in-handlebars-template