how to place yii2 form error in title of anchor tag

问题

This is my code

$form = ActiveForm::begin([
    'id' => 'login-form',
    'options' => ['class' => 'form-horizontal'],
    'fieldConfig' => [
        'template' => '
            {label}
            <div class="error-block">
                <a href="#" title="{error}">error</a>
            </div>
            {input}
            ',
        'errorOptions' => ['tag' => null]
    ],
]);

I want to add error in title of anchor tag in YII2

<a href="#" title="{error}">error</a>

回答1:

You need to display the error text inside the anchor tags title attribute, and using the template option wont help you achieve it automatically.

A few things in your approach.

You are specifying the "tag"=>null under the errorOptions which wont create the default html <p class="help-block help-block-error"></p>.
Even if you specify the tag as div or span even then it will break the HTML as the attribute title has double quotes <a href="#" title="{error}">error</a> and the tag created will also have double quotes <div class="help-block help-block-error"></div>.
Then if you change the <a href="#" title="{error}">error</a> to <a href="#" title=\'{error}\'>error</a> to fix the broken HTML the javascript wont be able to detect the element.

So then the event afterValidateAttribute will come to your rescue which is triggered after validating the whole form and each attribute.

The signature of the event handler should be:

function (event, attribute, messages)

where

event: an Event object.

attribute: the attribute being validated. Please refer to attributeDefaults for the structure of this parameter.

messages: an array to which you can add additional validation error messages for the specified attribute.

Now change the template under the fieldConfig to the following and remove the {error} from the template and the errorOptions, as it is not needed and just keep you custom error element inside the template.

'fieldConfig' => [
    'template' => '
        {label}
        <div class="error-block">
            <a href="#" title="">error</a>
        </div>
        {input}
        ',
],

Now add the below javascript at the top of your view where you are rendering the form.

$js = <<< JS
$("#login-form").on(
    'afterValidateAttribute',
    function (event,attribute,messages) {
        let input=attribute.input;
        $(input).siblings('.error-block').find('a').attr('title',messages.join(','));
    }
);
JS;
$this->registerJs($js, \yii\web\View::POS_READY);

Now if you focus out of the fields or hit the submit button you will see the error messages being populated in the title attribute of the a tag.

来源：https://stackoverflow.com/questions/53607230/how-to-place-yii2-form-error-in-title-of-anchor-tag

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php

Yii

yii2

yii2-advanced-app

yii2-validation