目的

需要將數據庫中取出的值進行前臺展示。

為了使用easyui拓展中的排序功能，需要把表格中的值顯示為int類型，但是如果是空字符串的話，轉換為int會報錯。如果全部轉換為str的話，排序會出問題（會按照字符排序而非數值大小）

解決方式：進行一下邏輯判斷。如果是None，則轉換為空字符串''，如果有值，則取其值（使用JinJa模板的{{ param }}獲取后端傳來的值）。

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部分js代碼示例

<script>$(document).ready(function() {var zNodes = [];var i=0;{% for node in result %}i++;var obj = new Object();obj.id = i;obj.p_code ='{{ node.p_code }}';obj.jan_mar_5_max ='{{ node.jan_mar_5_max }}'=='None'?'':{{ node.jan_mar_5_max }}; // 如果有值,填入int型值;如果無值,填入空字符串obj.jan_mar_5_min ='{{ node.jan_mar_5_min }}'=='None'?'':{{ node.jan_mar_5_min }};obj.mar_sep_5_max ='{{ node.mar_sep_5_max }}'=='None'?'':{{ node.mar_sep_5_max }};obj.mar_sep_5_min ='{{ node.mar_sep_5_min }}'=='None'?'':{{ node.mar_sep_5_min }};obj.jan_sep_5_max ='{{ node.jan_sep_5_max }}'=='None'?'':{{ node.jan_sep_5_max }};obj.jan_sep_5_min ='{{ node.jan_sep_5_min }}'=='None'?'':{{ node.jan_sep_5_min }};obj.mar_jan_5_max ='{{ node.mar_jan_5_max }}'=='None'?'':{{ node.mar_jan_5_max }};obj.mar_jan_5_min ='{{ node.mar_jan_5_min }}'=='None'?'':{{ node.mar_jan_5_min }};obj.sep_jan_5_max ='{{ node.sep_jan_5_max }}'=='None'?'':{{ node.sep_jan_5_max }};obj.sep_jan_5_min ='{{ node.sep_jan_5_min }}'=='None'?'':{{ node.sep_jan_5_min }};obj.sep_mar_5_max ='{{ node.sep_mar_5_max }}'=='None'?'':{{ node.sep_mar_5_max }};obj.sep_mar_5_min ='{{ node.sep_mar_5_min }}'=='None'?'':{{ node.sep_mar_5_min }};obj.jan_mar_his_max ='{{ node.jan_mar_his_max }}'=='None'?'':{{ node.jan_mar_his_max }};obj.jan_mar_his_min ='{{ node.jan_mar_his_min }}'=='None'?'':{{ node.jan_mar_his_min }};obj.mar_sep_his_max ='{{ node.mar_sep_his_max }}'=='None'?'':{{ node.mar_sep_his_max }};obj.mar_sep_his_min ='{{ node.mar_sep_his_min }}'=='None'?'':{{ node.mar_sep_his_min }};obj.jan_sep_his_max ='{{ node.jan_sep_his_max }}'=='None'?'':{{ node.jan_sep_his_max }};obj.jan_sep_his_min ='{{ node.jan_sep_his_min }}'=='None'?'':{{ node.jan_sep_his_min }};obj.mar_jan_his_max ='{{ node.mar_jan_his_max }}'=='None'?'':{{ node.mar_jan_his_max }};obj.mar_jan_his_min ='{{ node.mar_jan_his_min }}'=='None'?'':{{ node.mar_jan_his_min }};obj.sep_jan_his_max ='{{ node.sep_jan_his_max }}'=='None'?'':{{ node.sep_jan_his_max }};obj.sep_jan_his_min ='{{ node.sep_jan_his_min }}'=='None'?'':{{ node.sep_jan_his_min }};obj.sep_mar_his_max ='{{ node.sep_mar_his_max }}'=='None'?'':{{ node.sep_mar_his_max }};obj.sep_mar_his_min ='{{ node.sep_mar_his_min }}'=='None'?'':{{ node.sep_mar_his_min }};obj.cur_jan_mar ='{{ node.cur_jan_mar }}'=='None'?'':{{ node.cur_jan_mar }};obj.cur_mar_sep ='{{ node.cur_mar_sep }}'=='None'?'':{{ node.cur_mar_sep }};obj.cur_jan_sep ='{{ node.cur_jan_sep }}'=='None'?'':{{ node.cur_jan_sep }};obj.cur_mar_jan ='{{ node.cur_mar_jan }}'=='None'?'':{{ node.cur_mar_jan }};obj.cur_sep_jan ='{{ node.cur_sep_jan }}'=='None'?'':{{ node.cur_sep_jan }};obj.cur_sep_mar ='{{ node.cur_sep_mar }}'=='None'?'':{{ node.cur_sep_mar }};var jan_mar_5_space = (100*(obj.cur_jan_mar-obj.jan_mar_5_min)/(obj.jan_mar_5_max-obj.jan_mar_5_min)).toFixed(0);obj.jan_mar_5_space = isNaN(jan_mar_5_space)?'':jan_mar_5_space;var mar_sep_5_space = (100*(obj.cur_mar_sep-obj.mar_sep_5_min)/(obj.mar_sep_5_max-obj.mar_sep_5_min)).toFixed(0);obj.mar_sep_5_space = isNaN(mar_sep_5_space)?'':mar_sep_5_space;var jan_sep_5_space = (100*(obj.cur_jan_sep-obj.jan_sep_5_min)/(obj.jan_sep_5_max-obj.jan_sep_5_min)).toFixed(0);obj.jan_sep_5_space = isNaN(jan_sep_5_space)?'':jan_sep_5_space;var mar_jan_5_space = (100*(obj.cur_mar_jan-obj.mar_jan_5_min)/(obj.mar_jan_5_max-obj.mar_jan_5_min)).toFixed(0);obj.mar_jan_5_space = isNaN(mar_jan_5_space)?'':mar_jan_5_space;var sep_jan_5_space = (100*(obj.cur_sep_jan-obj.sep_jan_5_min)/(obj.sep_jan_5_max-obj.sep_jan_5_min)).toFixed(0);obj.sep_jan_5_space = isNaN(sep_jan_5_space)?'':sep_jan_5_space;var sep_mar_5_space = (100*(obj.cur_sep_mar-obj.sep_mar_5_min)/(obj.sep_mar_5_max-obj.sep_mar_5_min)).toFixed(0);obj.sep_mar_5_space = isNaN(sep_mar_5_space)?'':sep_mar_5_space;var jan_mar_his_space = (100*(obj.cur_jan_mar-obj.jan_mar_his_min)/(obj.jan_mar_his_max-obj.jan_mar_his_min)).toFixed(0);obj.jan_mar_his_space = isNaN(jan_mar_his_space)?'':jan_mar_his_space;var mar_sep_his_space = (100*(obj.cur_mar_sep-obj.mar_sep_his_min)/(obj.mar_sep_his_max-obj.mar_sep_his_min)).toFixed(0);obj.mar_sep_his_space = isNaN(mar_sep_his_space)?'':mar_sep_his_space;var jan_sep_his_space = (100*(obj.cur_jan_sep-obj.jan_sep_his_min)/(obj.jan_sep_his_max-obj.jan_sep_his_min)).toFixed(0);obj.jan_sep_his_space = isNaN(jan_sep_his_space)?'':jan_sep_his_space;var mar_jan_his_space = (100*(obj.cur_mar_jan-obj.mar_jan_his_min)/(obj.mar_jan_his_max-obj.mar_jan_his_min)).toFixed(0);obj.mar_jan_his_space = isNaN(mar_jan_his_space)?'':mar_jan_his_space;var sep_jan_his_space = (100*(obj.cur_sep_jan-obj.sep_jan_his_min)/(obj.sep_jan_his_max-obj.sep_jan_his_min)).toFixed(0);obj.sep_jan_his_space = isNaN(sep_jan_his_space)?'':sep_jan_his_space;var sep_mar_his_space = (100*(obj.cur_sep_mar-obj.sep_mar_his_min)/(obj.sep_mar_his_max-obj.sep_mar_his_min)).toFixed(0);obj.sep_mar_his_space = isNaN(sep_mar_his_space)?'':sep_mar_his_space;obj.upstream_date = '{{ node.upstream_date }}';zNodes.push(obj);{% endfor %}function resolve() {console.log(zNodes);return zNodes;}$('#dg').datagrid({filterBtnIconCls:'icon-filter',data:resolve(),striped: true //隔行變色});})</script>

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easyui表格展示

可以看到空值（空字符串）也參與了排序。

總結

以上是生活随笔為你收集整理的【JavaScript+JinJa2】表格中将后台传入的None值显示为空字符串，将数据显示为int类型值的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。