validate.js

var Validate = function(table){
    this.table = table;
};

//validate
Validate.prototype.initializeColumn = function(column){
    var self = this,
    config = [],
    validator;

    if(column.definition.validator){

        if(Array.isArray(column.definition.validator)){
            column.definition.validator.forEach(function(item){
                validator = self._extractValidator(item);

                if(validator){
                    config.push(validator);
                }
            });

        }else{
            validator = this._extractValidator(column.definition.validator);

            if(validator){
                config.push(validator);
            }
        }

        column.modules.validate = config.length ? config : false;
    }
};

Validate.prototype._extractValidator = function(value){
    var type, params, pos;

    switch(typeof value){
        case "string":
        pos = value.indexOf(':');

        if(pos > -1){
            type = value.substring(0,pos);
            params = value.substring(pos+1);
        }else{
            type = value;
        }

        return this._buildValidator(type, params);
        break;

        case "function":
        return this._buildValidator(value);
        break;

        case "object":
        return this._buildValidator(value.type, value.parameters);
        break;
    }
};

Validate.prototype._buildValidator = function(type, params){

    var func = typeof type == "function" ? type : this.validators[type];

    if(!func){
        console.warn("Validator Setup Error - No matching validator found:", type);
        return false;
    }else{
        return {
            type:typeof type == "function" ? "function" : type,
            func:func,
            params:params,
        };
    }
};


Validate.prototype.validate = function(validators, cell, value){
    var self = this,
    valid = [];

    if(validators){
        validators.forEach(function(item){
            if(!item.func.call(self, cell, value, item.params)){
                valid.push({
                    type:item.type,
                    parameters:item.params
                });
            }
        });
    }

    return valid.length ? valid : true;
};

Validate.prototype.validators = {

    //is integer
    integer: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        value = Number(value);
        return typeof value === 'number' && isFinite(value) && Math.floor(value) === value;
    },

    //is float
    float: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        value = Number(value);
        return typeof value === 'number' && isFinite(value) && value % 1 !== 0;
    },

    //must be a number
    numeric: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        return !isNaN(value);
    },

    //must be a string
    string: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        return isNaN(value);
    },

    //maximum value
    max: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        return parseFloat(value) <= parameters;
    },

    //minimum value
    min: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        return parseFloat(value) >= parameters;
    },

    //minimum string length
    minLength: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        return String(value).length >= parameters;
    },

    //maximum string length
    maxLength: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        return String(value).length <= parameters;
    },

    //in provided value list
    in: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        if(typeof parameters == "string"){
            parameters = parameters.split("|");
        }

        return value === "" || parameters.indexOf(value) > -1;
    },

    //must match provided regex
    regex: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        var reg = new RegExp(parameters);

        return reg.test(value);
    },

    //value must be unique in this column
    unique: function(cell, value, parameters){
        if(value === "" || value === null || typeof value === "undefined"){
            return true;
        }
        var unique = true;

        var cellData = cell.getData();
        var column = cell.getColumn()._getSelf();

        this.table.rowManager.rows.forEach(function(row){
            var data = row.getData();

            if(data !== cellData){
                if(value == column.getFieldValue(data)){
                    unique = false;
                }
            }
        });

        return unique;
    },

    //must have a value
    required:function(cell, value, parameters){
        return value !== "" && value !== null && typeof value !== "undefined";
    },
};


Tabulator.prototype.registerModule("validate", Validate);