I am assuming that by entity you actually mean object and what you want to do is create a new object to store some data? If so this is how you can do it using the client API:
https://apidocs.mendix.com/7/client/mx.data.html#.create
Example:
mx.data.create({
entity: "MyFirstModule.Cat",
callback: function(obj) {
console.log("Object created on server");
},
error: function(e) {
console.error("Could not commit object:", e);
}
});
If you truly want to create a new entity with a new attribute, this can also be done using the Model SDK:
https://docs.mendix.com/apidocs-mxsdk/mxsdk/creating-the-domain-model
workingCopy => {
const dm = pickDomainModel(workingCopy);
const domainModel = dm.asLoaded();
const customer = domainmodels.Entity.createIn(domainModel);
customer.name = `Customer`;
customer.location = { x: 100, y: 100 };
const invoice = domainmodels.Entity.createIn(domainModel);
invoice.name = `Invoice`;
invoice.location = { x: 400, y: 100 };
return workingCopy;
}
function passStringToMicroflow(stringValue) {
//You must create an entity in some module's domain model. In this example the module is:
// "ModuleNameWhereEntityIsCreated"
// and the entity name is "YourEntityName".
//This entity must have a string as a property. In this example is "MyStringPropertyName".
//In Mendix it is possible to pass only objects from JS to microflows .
//So here is the code:
mx.data.create({
entity: "ModuleNameWhereEntityIsCreated.YourEntityName",
callback: function (obj) {
obj.set('MyStringPropertyName', stringValue);
mx.data.action({
params: {
applyto: "selection",
actionname: "SomeModuleNameWhereMicroflowIs.TheNameOftheMicroflow",
guids: [obj.getGuid()],
},
});
}
});
}