在弹出窗口中填充来自 groovy 控制器的数据

Question

I have a gsp page with a delete button for each row of a table. On the button click I want a pop up which tells the consequences of the delete. These consequences depends on the data present in the row and a few other constraints known to the grails service which is called from the grails controller associated to the gsp page. If the user confirms these consequences the row should be deleted from the table, else the table remains unchanged.

How should i go about to achieve this behavior?

Currently, I have in my gsp

<tr>
    <td>name</td>
    <td>parentName</td>
    <td>data</td>
    <td>
        <g:link action="deleteRow" params="${[name: row.name, parentName: row.parentName]}">
            <button class="deleteSnapshot">Delete</button>
        </g:link>
    </td>
</tr>

and in my .js file

$(document).on('click', ':button', function (e) {
        var btn = $(e.target);
        btn.attr("disabled", "disabled"); // disable button
        alert('getting deletion details');
        //var deletionDetails -->not sure how to get these
        //var deletionDetails will get data from controller action:"getDetails"
        if (confirm('/*print deletion details and ask*/ Do you want to proceed?')) {
            alert('will delete')
            return true
        }
        else {
            btn.removeAttr("disabled"); // enable button
            return false
        }
    });

and in my controller

class DeleteController{
    DeleteService deleteService
    def index() {
        [list:deleteService.getTableList()]
    }
    def getDeletionDetails(string name, String parentName){
        return deleteService.getDetails(name,parentName)
    }
    def deleteRow(String name, String parentName){
        service.deleteRow(name, parentName)
        redirect controller:"DeleteController", action:"index"
    }
}

I know the deletion works fine, because it works even with in the current state. Just that the confirmation box asks Do you want to proceed, without displaying the details.

Any help on how i could achieve what I am looking for will be appreciated.

PS I am new to stackoverflow, so if i missed out on certain convention do let me know.

Thanks in advance.

Answer 1

I can think of two ways of doing it:

The first one is using ajax to both get deletion details and delete the row

Assuming that deleteService.getDetails(name, parentName) returns a String, first you need to change an getDeletionDetails action so it renders the response:

def getDeletionDetails(String name, String parentName){
    render deleteService.getDetails(name, parentName)
}

and change g:link -s to buttons in gsp :

<button data-name="${row.name}" data-parent-name="${row.parentName}">
     Delete
</button>

In your .js then put:

$(document).on('click', ':button', function (e) {
    var btn = $(e.target);

    btn.attr("disabled", "disabled"); // disable button

    var name = btn.data('name');
    var parentName = btn.data('parentName');

    $.ajax({
        url: "/delete/getDeletionDetails",
        data: {
            name: name,
            parentName: parentName
        },
        success: function (data) {
            if (confirm(data + '\nDo you want to proceed?')) {
                $.ajax({
                    url: '/delete/deleteRow',
                    data: {
                        name: name,
                        parentName: parentName
                    },
                    success: function (d) {
                        console.log("Success: " + d);
                    }
                });
            } else {
                btn.removeAttr("disabled"); // enable button
            }
        }
    });
});

What this code does is it sends an ajax call to /delete/getDeletionDetails , then uses its response (rendered by getDeletionDetails action in DeleteController ) to show a confirmation alert. If user confirms the question, another ajax call is sent - now to deleteRow action of DeleteController - with parameters taken from data attributes of clicked button. If user cancels - nothing happens, except for reenabling a button.

Your deleteRow should only change the return statement - it also must render the response:

def deleteRow(String name, String parentName){
    service.deleteRow(name, parentName)
    render "You deleted an item $name - $parentName."
}

You don't need redirect here, because - thanks to using ajax - user will never leave delete/index . You can just display some kind of confirmation on page after successful ajax call.

The second option is to put deletion details in hidden fields or data- attributes in each row and then just retrieve them in js :

You can create a method getDeletionDetails() in row 's domain class (presumably Row ) that returns the details (using services in domain classes is not perfect, but is should work ok if the service is not very complex). Then, in your .gsp place:

<td>
    <g:link action="deleteRow" params="${[name: row.name, parentName: row.parentName]}">
        <button class="deleteSnapshot" data-details="${row.deletionDetails}">Delete</button>
    </g:link>
</td>

You should then be able to get details in .js like this:

var deletionDetails = btn.data('details');