      <div class="form-group">
        <label class="col-sm-2 control-label">設(shè)備類別</label>
        <div class="col-sm-4">
          <select class="basic-single" name="codeCategory" onchange="showCodeSubCate()" id="codeCategory" style="width: 100%">
          
          </select>
        </div>
        <label class="col-sm-2 control-label">設(shè)備子類</label>
        <div class="col-sm-4">
          <select class="basic-single" name="codeSubCategory" id="codeSubCate" disabled="disabled" style="width: 100%">
            <option value="">--請選擇--</option>
          </select>
        </div>
</div>

該頁面內(nèi)涉及到了兩個select，分別為：設(shè)備分類和設(shè)備子類，其中設(shè)備分類為一級菜單，設(shè)備子類為二級菜單，設(shè)備子類的顯示內(nèi)容由設(shè)備分類決定。

下面來看ajax代碼段：

function addCodeCategory(){
    $.ajax({
      url: "<%=request.getContextPath()%>/facilitydict/showCodeCategory",
      async: false, //請求是否異步，默認為異步，這也是ajax重要特性
      type: "GET",  //請求方式
      success: function(result) {
        result = $.parseJSON(result);
        var data = result.data;
        var codeCates = data.split(",");
        str ='<option value="6801">--請選擇--</option>';
        for(x in codeCates){
          str+='<option value="'+codeCates[x]+'">'+codeCates[x]+'</option>';
        }
        $("#codeCategory").html(str);
        
      }
    });
  }
  
  function showCodeSubCate(){
    $("#codeSubCate").prop("disabled","");//將設(shè)備子類的select解除鎖定
    var target = $("#codeCategory option:selected").text();
    $.ajax({
      url: "<%=request.getContextPath()%>/facilitydict/showCodeSubCategory",
      data : {codeCategory:target},
      async: false, //請求是否異步，默認為異步，這也是ajax重要特性
      type: "GET",  //請求方式
      success: function(result) {
        result = $.parseJSON(result);
        var data = result.data;
        var codeCates = data.split(",");
        var str="";
        for(x in codeCates){
          str+='<option value="'+codeCates[x]+'">'+codeCates[x]+'</option>';
        }
        $("#codeSubCate").html(str);
      }
    });
  }

不難看出，當設(shè)備分類選擇器內(nèi)的內(nèi)容發(fā)生改變后，觸發(fā)showCodeSubCate函數(shù)來請求后臺獲取數(shù)據(jù)，然后把請求到的數(shù)據(jù)添加到設(shè)備子類對應(yīng)的select內(nèi)。后臺代碼的實現(xiàn)如下（只貼出controller的方法）：

@RequestMapping("/showCodeCategory")
  @ResponseBody
  public Result<String> searchCodeCategory() {

    Result<String> rs = new Result<>();
    List<String> codeCategorys = facilityDictService.searchCodeCategory();
    String codeCate = StringUtil.collectionToCommaDelimitedString(codeCategorys);
    rs.setData(codeCate);
    return rs;

  }

  @RequestMapping("/showCodeSubCategory")
  @ResponseBody
  public Result<String> searchCodeSubCategory(HttpServletRequest request) {
    String codeCategory = request.getParameter("codeCategory");
    Result<String> rs = new Result<>();
    List<String> codeSubCategorys = facilityDictService.searchCodeSubCategory(codeCategory);
    String codeCate = StringUtil.collectionToCommaDelimitedString(codeSubCategorys);
    rs.setData(codeCate);
    return rs;
  }

這兩個方法分別對應(yīng)上面的兩個ajax請求，值得介紹的是后臺返回的數(shù)據(jù)，返回值類型為Result<String>，該返回值類型是一個工具類，具體實現(xiàn)可以在我的博客中查看，鏈接為：http://www.cnblogs.com/blog411032/p/5799669.html

ajax與后臺交互傳輸數(shù)據(jù)的工具類

 public class Result<T> implements Serializable {

  private static final long serialVersionUID = 3637122497350396679L;

  private boolean success;
  private T data;
  private String msg;

  public Result() {
  }

  public Result(boolean success) {
    this.success = success;
  }

  public boolean isSuccess() {
    return success;
  }

  public void setSuccess(boolean success) {
    this.success = success;
  }

  public T getData() {
    return data;
  }

  public void setData(T data) {
    this.data = data;
  }

  public String getMsg() {
    return msg;
  }

  public void setMsg(String msg) {
    this.msg = msg;
  }

  public Result(boolean success, String msg) {
    super();
    this.success = success;
    this.msg = msg;
  }

  public Result(boolean success, T data) {
    super();
    this.success = success;
    this.data = data;
  }

}

該類為前后臺交互提供了非常大的便捷：

下面是前后臺的ajax交互：

前臺ajax代碼：

$.ajax({
      url: "<%=request.getContextPath()%>/supp/deleteSupp",
      data : {supplierId:supplierId},
      async: false, //請求是否異步，默認為異步，這也是ajax重要特性
      type: "GET",  //請求方式
      success: function(data) {
        var rs = eval('('+data+')');
        flag = rs.success;
        if(flag){
          alert("刪除成功!");
        }
      }
    });

下面是后臺java代碼：

  @RequestMapping("/deleteSupp")
  @ResponseBody
  public Result<String> deleteSupplier(HttpServletRequest request){
    Result<String> rs = new Result<>();
    String supplierId = request.getParameter("supplierId");
    supplierService.deleteSupplierById(supplierId);
    rs.setSuccess(true);
    return rs;
  }

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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