In yii2, dropDownList implements two-level and three-level linkage writing,

In yii2, dropDownList implements two-level and three-level linkage writing,

Sort out the document, search out the code of the dropDownList in yii2 to implement the second-level and third-level linkage writing, and sort it down and share it.

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<? Php $ form = ActiveForm: begin (['action' => ['index'], 'method' => 'get',]);?> <! -- Level-1 directory --> <? = $ Form-> field ($ model, 'cocate _ id')-> dropDownList (Helper: courseCateMap (), ['propt' => yii :: t ('backend', 'Please select course cate')])?> <! -- Level 2 Directory --> <? = $ Form-> field ($ model, 'course _ id')-> dropDownList (Helper: courseMap ($ model-> cocate_id), ['propt' => yii:: t ('backend', 'Please select first course cate')])?> <! -- Level 3 directory --> <? = $ Form-> field ($ model, 'person _ id')-> dropDownList (Helper: personMap (1, $ model-> cocate_id ), ['propt' => yii: t ('backend', 'Please select person')])?> <? Php ActiveForm: end ();?> Page nested js <? Php $ js = '// classification $ ("# classsearch-cocate_id "). change (function () {var cocateId = $ (this ). val (); // get the value of the first-level directory $ ("# classsearch-course_id" cmd.html ("<option value = \" \ "> '. yii: t ('backend', 'Please select course '). '</option> "); // second-level display directory tag $ (" # classsearch-person_id ").html (" <option value = \ "\"> '. yii: t ('backend', 'Please select person '). '</option> "); // Three-Level Display directory label (if you only need two or three levels, you can delete them directly) if (cocateId> 0) {getCourse (coca TeId); // The getPerson (cocateId) method for querying second-level directories; // The method for querying third-level directories (if you only need second-level three, you can delete them directly )}}); function getCourse (cocateId) {var href = "'. url: to (['/ajax/option']). '"; // request address $. ajax ({"type": "GET", "url": href, "data": {cocateId: cocateId, type: "course "}, // required parameter and type success: function (d) {$ ("# classsearch-course_id "). append (d); // return value output});} function getPerson (cocateId) {var href = "'. url: to (['/ajax/option']). '"; // Same as above $. ajax ({"type": "GET", "url": href, "data": {cocateId: cocateId, type: "person "}, // required parameter and type success: function (d) {$ ("# classsearch-person_id "). append (d); // same as above});} '; $ this-> registerJs ($ js);?>

Php code:

This is the Controller declared by ajax:

<?php namespace backend\controllers;class AjaxController extends BaseController{    public function actionOption($cocateId, $type)  {    switch ($type) {      case 'course':        $_data = Helper::courseMap($cocateId);        break;      case 'person':        $_data = Helper::personMap(1, $cocateId);        break;      case 'class':        $_data = Helper::classMap($cocateId);        break;    }      $_tmp = '';    foreach ($_data as $key => $val) {      $_tmp .= "<option value='" . $key . "'>{$val}</option>";    }    echo $_tmp;  }

The classes encapsulated by Helper. php can be referenced in the configuration by creating files separately:

<? Phpnamespace backend \ components; // The inherited space Path class Helper // Declaration class {// declare the query method level public static function courseCateMap () {$ _ data = CourseCate :: find ()-> select ('cocate _ id, cocate_name ')-> all (); $ _ data = ArrayHelper: map (array_merge ($ _ data ), 'cocate _ id', 'cocate _ name'); return $ _ data;} // declare the second-level public static function courseMap ($ cocateId) of the query method) {$ condition ['cocate _ id'] = $ cocateId; $ _ data = Course: find ()-> sele Ct ('course _ id, course_name ')-> where ($ condition)-> all (); $ _ data = ArrayHelper: map (array_merge ($ _ data ), 'Course _ id', 'course _ name'); return $ _ data;} // declare the three-level public static function personMap ($ percateId, $ cocateId = 0) of the query method) {$ shopId = Yii: $ app-> user-> identity-> shop_id; $ condition = []; if ($ shopId) {$ condition ['shop _ id'] = $ shopId;} if ($ percateId) {$ condition ['percate _ id'] = $ percateId;} if ($ CocateId) {$ condition ['cocate _ id'] = intval ($ cocateId);} $ _ data = Person: find ()-> select ('person _ id, person_name ')-> where ($ condition)-> all (); $ _ data = ArrayHelper: map (array_merge ($ _ data), 'person _ id ', 'person _ name'); return $ _ data ;}}?>

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