Yii Framework official guide series 19-use forms: create forms

Writing the login view is very simple. we start with a form mark, and its action attribute should be the URL of the login action described earlier. Then we need...

Writing the login view is very simple. we start with a form mark, and its action attribute should be the URL of the login action described earlier. Then we need to insert tags and form fields for the attributes declared in the LoginForm class. Finally, we insert a button that allows users to click to submit this form. All of these can be done with pure HTML code.

Yii provides several helper (helper) classes to simplify view writing. For example, to create a text input field, call CHtml: textField (); to create a drop-down list, call CHtml: dropDownList ().

Information:You may want to know the benefits of using assistants, if they require the equivalent amount of code to directly write pure HTML code. The answer is that the assistant can provide more functions than HTML code. For example, the following code generates a text input field, which can trigger the form submission action when the user modifies its value.

CHtml: textField ($ name, $ value, array ('submit '=> ''));

Otherwise, you need to write a lot of JavaScript.

Next, we use CHtml to create a login form. Assume that the variable $ model is an instance of LoginForm.

The above code generates a more dynamic form, for example, CHtml: activeLabel () to generate a tag related to the features of the specified model. If an input error occurs for this feature, the CSS class of the label changes to error, and the appearance of the label is changed through the CSS style. Similarly, CHtml: activeTextField () generates a text input field for the features of the specified model and changes its CSS class when an error occurs.

If we use the CSS style file provided by yiic script, the generated form will be like the following:

From version 1.1.1, a new small object CActiveForm is provided to simplify form creation. This small object provides seamless and consistent verification between the client and the server. With CActiveForm, the above code can be rewritten:

  beginWidget('CActiveForm'); ?>    
  errorSummary($model); ?>    
        
  label($model,'username'); ?>        
  textField($model,'username') ?>    
    
        
  label($model,'password'); ?>        
  passwordField($model,'password') ?>    
    
        
  checkBox($model,'rememberMe'); ?>        
  label($model,'rememberMe'); ?>    
    
        
      
 endWidget(); ?>

 

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