Populating a hidden form field

问题

The GET operation on my application returns the data in an array:

Value":[{"Id":"6b7","Notes":"testing","CreatedBy":"User1"},{"Id":"6b7","Notes":"Testing 1","CreatedBy":"User2"}]

I use the above to populate a template:

<div class="create-note">
    <form>
        **<input type="hidden" id="Id" name="Id" value="{{this.Value.Id}}" />**       

        <textarea id="Notes" name="Notes"></textarea>       
        <button for="" type="submit" class="btn btn-primary ">Add Note</button>
        <button type="reset" class="btn">Cancel</button>
    </form>
            {{#unless this.Value.length}}
    <div class="alert alert-info">Notes do not exist.</div>
{{else}}
<table class="table">
    <thead>
        <tr>                        
            <th style="text-align:left">Note</th>
            <th style="text-align:left">Created By</th>
        </tr>
    </thead>
    <tbody>
        {{#each this.Value}}
            <tr>                
                <td>
                    {{this.Notes}}
                </td>
                <td>
                    {{this.CreatedBy}}
                </td>
            </tr>
        {{/each}}
    </tbody>
</table>
{{/unless}}
</div>

How do I populate the hidden form field (Id). value={{this.Value.Id}} doesn't work because we have an array.

回答1:

Pull the Id out in JavaScript and put it where you want it:

var data = {
    "Value": [
        {"Id": "6b7", "Notes": "testing", "CreatedBy": "User1"},
        {"Id": "6b7", "Notes": "Testing 1", "CreatedBy": "User2"}
    ]
};
data.Id = data.Value[0].Id;

var tmpl = Handlebars.compile($('#template').html());
var html = tmpl(data);

And then refer to {{this.Id}} (or just {{Id}}) in your template.

Demo: http://jsfiddle.net/ambiguous/WSAxn/

Alternatively, add a helper that can dig the value out but that's seems like unnecessary complexity.

You have to get used to massaging your data into a Handlebars-friendly form if you're going to use Handlebars. The simplicity of Handlebars has both advantages and drawbacks.

来源：https://stackoverflow.com/questions/12520939/populating-a-hidden-form-field