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FieldValue

<?php YsJQuery::usePlugin(YsJQueryConstant::PLUGIN_JQFORM); ?>

<button id="btnOpenDialog">Show Demo</button>
<?php echo YsUIDialog::initWidget('dialogId','style="display:none" title="Basic dialog"') ?>
<div id="response">Try: admin | admin</div>
<form action="examples/response/loginResponse.php" method="post"  name="frmName" id="myFormId" >
  <p>User: <input type="text" value="User" id="txtUser" name="user"></p>
  <p>Pass: <input type="password" value="" id="txtPass" name="pass"></p>
  <p align="center">
    <input type="button" id="btnGetValue" class="ui-button" value="Value" />
  </p>
</form>
<?php echo YsUIDialog::endWidget() ?>

<?php
echo
YsJQuery::newInstance()
  ->onClick()
  ->in("#btnOpenDialog")
  ->execute(
    YsUIDialog::build('#dialogId')
      ->_modal(true)
      ->_width(300)
      ->_height('auto')
      ->_buttons(array(
        'Ok' => new YsJsFunction('alert("Hello world")'),
        'Close' =>  new YsJsFunction(YsUIDialog::close('this')))
       ),
    YsUIButton::build('.ui-button')
  )
?>

<?php
echo
YsJQuery::newInstance()
  ->onClick()
  ->in("#btnGetValue")
  ->execute(
    sprintf('alert("value: " + %s)', YsJQForm::fieldValue('#myFormId #txtUser') )
  )
?>

Show Demo