ExtJs dependent field validation

问题

How do I validate one field which is dependent on another field?

{
  xtype:          'textfield',
  name:           'name2',
  vtype:          'type',      // how to write the validation code for this if it 
                               // depends on the value of another field?
  allowBlank:     false
}

回答1:

By adding your own custom validator and therein perform your validation.

var field_one = new Ext.form.TextField({
    name: 'field_one',
    fieldLabel: 'Field one'
});

var field_two = new Ext.form.TextField({
    name: 'field_two',
    fieldLabel: 'Field two',
    validator: function(value){
        if(field_one.getValue() != value) {
            return 'Error! Value not identical to field one';
        } else {
            return true;
        }
    }
});

回答2:

field definition:

....
monitorValid:     true,
....
}, {
  xtype:          'textfield',
  name:           'name1',
  ref:            'name1',

}, {
  xtype:          'textfield',
  name:           'name2',
  ref:            'name2',
  allowBlank:     false,
....

next in initComponent (or listener if you preffer):

this.name2.on ( 'change', this._validate_name2, this );

and define handler in FormPanel:

this._validate_name2: function ( ) {
   if ( this.name1.getValue () == this.name2.getValue () ) {
      this.name2.markInvalid ( 'field does not match name1' );
      this.name2.setValue ( null );
   }
}

"markInvalid () method does not cause the Field's validate method to return false if the value does pass validation. So simply marking a Field as invalid will not prevent submission of forms submitted with the Ext.form.Action.Submit.clientValidation option set."

For this reason combination allowBlank and setValue ( null ) will break validation

回答3:

I mocked up an example of how I'm doing this with comboboxes in Ext JS 5.1... it's easily portable to Ext 4 code, you'd just have to make use of initComponent instead of ViewController's init. Here's the code (and Fiddle):

Ext.application({
  name: 'Fiddle',

  launch: function() {
    Ext.define('MyComboViewController', {
      extend: 'Ext.app.ViewController',
      alias: 'controller.mycombo',
      init: function() {
        this.getView().setStore(this.createStore());
      },
      createStore: function() {
        var store = Ext.create('Ext.data.Store', {
          fields: [
            {name: 'disp', type: 'string'},
            {name: 'val', type: 'int'}
          ],
          data: [
            {disp: 'One', val: 1},
            {disp: 'Two', val: 2},
            {disp: 'Three', val: 3},
            {disp: 'Four', val: 4},
            {disp: 'Five', val: 5}
          ],
          proxy: {
            type: 'memory'
          }
        });
        return store;
      }
    });

    Ext.define('MyCombo', {
      extend: 'Ext.form.field.ComboBox',
      xtype: 'myCombo',
      controller: 'mycombo',
      displayField: 'disp',
      valueField: 'val',
      labelAlign: 'top',
      validateOnChange: false,
      typeAhead: true,
      queryMode: 'local'
    });

    Ext.define('MyCombosContainerViewController', {
      extend: 'Ext.app.ViewController',
      alias: 'controller.mycomboscontainer',
      init: function() {
        var startCombo = this.lookupReference('startCombo');
        var endCombo = this.lookupReference('endCombo');
        startCombo.validator = Ext.bind(this.comboValidator, this, [startCombo, endCombo]);
        endCombo.validator = Ext.bind(this.comboValidator, this, [startCombo, endCombo]);
      },
      comboValidator: function(startCombo, endCombo) {
        return startCombo.getValue() < endCombo.getValue();
      },
      onSelectComboBox: function(combo) {
        var startCombo = this.lookupReference('startCombo');
        var endCombo = this.lookupReference('endCombo');
        startCombo.validate();
        endCombo.validate();
      }
    });

    Ext.define('MyCombosContainer', {
      extend: 'Ext.form.FieldContainer',
      controller: 'mycomboscontainer',
      layout: {
        type: 'hbox',
        align: 'stretch'
      },
      items: [{
        xtype: 'myCombo',
        reference: 'startCombo',
        fieldLabel: 'Start',
        listeners: {
          select: 'onSelectComboBox'
        }
      }, {
        xtype: 'myCombo',
        reference: 'endCombo',
        fieldLabel: 'End',
        listeners: {
          select: 'onSelectComboBox'
        }
      }]
    });

    Ext.create('MyCombosContainer', {
      renderTo: Ext.getBody()
    });
  }
});

回答4:

To validate linked fields I usually create function (I add this to my Ext.lib.Validators class so I can call it in whole application) that returns an anonymous function with preconfigured scope and validation logic (so I can use it multiple times across my application).

Here is an example:

myValidator: function (firstFieldSelector, secondFieldSelector, thirdFieldSelector) {
    return function () {
        var firstField = Ext.ComponentQuery.query(firstFieldSelector)[0],
            secondField= Ext.ComponentQuery.query(secondFieldSelector)[0],
            thirdField= Ext.ComponentQuery.query(thirdFieldSelector)[0];

        if (firstField && secondField && thirdField) {
            // Validation logic here...
            if( true ) {
                return true;
            } else {
                return 'Error text here...';
            }
        } else {
            // Validator incorrectly configured, do not validate with it
            return true;
        }
    }
}

And here is an example fiddle with timespan selection.

回答5:

Generically - I would suggest to hook up change event listeners on all fields which needs to have cross validation. In change event handler we need to trigger validation on every other field which needs to validation with the field being modified. this approach works very well when you have a form and there are lots of fields and lots of validations needs to be done.

来源：https://stackoverflow.com/questions/5186595/extjs-dependent-field-validation