Question

I have a grails project where I need to select the fields that I want to delete and when I click ‘delete’ I need a function to delete all selected items:

html code:

<form name="bookForm" action="list" method="post">
    ....
    <g:link controller="book" action="delete">Delete</g:link>
    ....
    ....
    <g:checkBox id="select_all" name="select_all" value="" onclick="selectAll();" />
    ....
    <g:each in="${bookList}" status="i" var="bookInstance">
        <tr class="${(i % 2) == 0 ? 'odd' : 'even'}">
            <td><g:checkBox id="${bookInstance.id}" name="delete_checkbox" value="" /></td>
        </tr>
    </g:each>
    ....
</form>

javascript code:

<script type="text/javascript">
    function selectAll(){//this function is used to check or uncheck all checkboxes
        var select = document.getElementById("select_all");
        var checkboxes = document.forms['bookForm'].elements['delete_checkbox'];
        if (select.checked){
            for (i = 0; i < checkboxes.length; i++) checkboxes[i].checked = true;
        }else{
            for (i = 0; i < checkboxes.length; i++) checkboxes[i].checked = false;
        }
    }//this function works fine
</script>

Problem:

I need the action to check all checkboxes in the list gsp, and if they are checked, take their ids and delete the record by id.

Can i do that either by groovy or javascript?

Answer 1

Rewrite your checkbox like:

<g:checkBox id="delete_checkbox" name="delete_checkbox" value="${bookInstance.id}" />

So, when you submit, you’ll get an array of ids called _delete_checkbox or delete_checkbox inside your params map. To see what you’re getting you can try printing your params inside the action.

println params

You can get the desired array by using params['nameOfTheAttribute'].
Once you have the array of ids, iterate over it and delete them all.