Question

I need to make an Ajax query to call a method in a Service object that takes 3 parameters and returns a boolean. I then use this Boolean for a validation message that happens pre-post.

This is what I have at the moment (not working) but I’ve tried other things but to no avail. We’re using JQuery and Grails:

var isUnique = ${remoteFunction(
    service: 'Project', 
    action:'checkUniqueUserProjectId',
    params:{
        // These values are from  hidden fields in the form.
        // userId and projectId are string values and the group is an object
        uniqueId: userId,
        group: userGroup,
        projectId: myProjectId
    }
)}

Here’s the method that is called in the ProjectService:

// Check whether or not a Project with the provided uniqueId already exists 
// in the database that is not itself.
def checkUniqueUserProjectId(uniqueId,group,projectId) {
    def filterCriteria = Project.createCriteria()
    def projectList = filterCriteria.list {
        and {
            eq("userProjectId", uniqueId)
            eq("group", group)
            ne("id",projectId)
        }
    }

    if(projectList.empty)
        return true
    else
        return false
}

Any help would be greatly appreciated!

Answer 1

I ended up using a remote function with the code as follows:

${remoteFunction(action: 'isUniqueId', params: '\'uniqueid=\'+userId+\'&project_id=\'+myProjectId', onFailure:'$("#project").submit()', onSuccess:'verifyUniqueness(data, textStatus,detailsMessage)') }

….

function verifyUniqueness(data, textStatus,detailsMessage) {
    if (data == 'false') {
        detailsMessage = detailsMessage + "A Project with the provided Project ID already exists.";
    }

    if (detailsMessage.trim() != '' ) { 
        stackedSummary.section('details', '<font style="color:red; font-weight:normal; line-height:0px;">' + detailsMessage + '</font>');
    } else {
        $('#project').submit();
    }
}

ProjectController

def isUniqueId = {
    def project = Project.get(params.project_id)
    if (project == null) {
        render(projectService.checkUniqueUserProjectId(params.uniqueid, null, null)) as JSON
    } else {
        render(projectService.checkUniqueUserProjectId(params.uniqueid, project.group, project.id)) as JSON
    }
}

Thank you everyone for your help! You helped lead me in the right direction 🙂