在django template中定义临时变量，并自定义操作：赋值、自增

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定义临时变量：

{% with i=1 %}{{i}}{% endwith %}

定义对临时变量操作的tag

在templatetags中创建set_val.py

内容是

from django import templateimport loggingregister = template.Library()class SetVarNode(template.Node):    def __init__(self, var_name, var_value):        self.var_name = var_name        self.var_value = var_value    def render(self, context):        try:            value = template.Variable(self.var_value).resolve(context)        except template.VariableDoesNotExist:            value = ""        context[self.var_name] = value        return u""class VarAddOneNode(template.Node):    def __init__(self, var_name):        self.var_name = var_name    def render(self, context):        try:            value = template.Variable(self.var_name).resolve(context)            context[self.var_name] = str( int(value) + 1 )        except template.VariableDoesNotExist:            value = ""        return u""def set_var(parser, token):    """        {% set <var_name>  = <var_value> %}    """    parts = token.split_contents()    logging.info('len(parts)=' + str(len(parts)))    if len(parts) == 2:        content = parts[1]        if content[len(content)-2 :len(content)] == '++':            var_name = content[:len(content) - 2]            return VarAddOneNode(var_name)        else:            return u""    elif len(parts) == 4:        return SetVarNode(parts[1], parts[3])        # raise template.TemplateSyntaxError("'set' tag must be of the form:  {% set <var_name>  = <var_value> %}")register.tag('set', set_var)

然后在template中引入

{% load set_val %}

前端代码示例

 {% load set_val %}    <div class="layui-form-item">        <div class="layui-form-label">商品尺码</div>        <div class="layui-input-block">            {% with i=1 %}
    {% set i = 2 %}                {% for size in  size_list %}                    <div class="layui-col-md2">                        <div class="layui-row">                            原名：{{ size.sizeName }}                        </div>                        名字：                        <input style="width: 40px;display:inline;" type="text" name="color" ,                               lay-verify="required"                               autocomplete="off" placeholder=""                               class="layui-input" value={{ size.sizeName }}>                        <br>                        <input type="checkbox" name="size{{ i }}" lay-skin="primary" checked="checked">                        {% set i++ %}                    </div>                {% endfor %}            {% endwith %}        </div>    </div>

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