考虑一下这个new-food.html:
<form>
<h2>Food Name</h2>
<input type="text" name="food" value="%(foodname)s">
<h2>Sides:<h2>
<input type="checkbox" name="sides" value="with_salad"> With Salad
<input type="checkbox" name="sides" value="with_fries"> With Fries
<input type="submit">
</form>
在提交时,它会创建一个 food 实体,并保存这些项目['apple', 'mango']
。当我们想要编辑这个实体时会发生什么? %(foodname)s
将保留食物名称文本字段,但我们如何保留页面上传的复选框字段,如下所示:
<input type="checkbox" name="sides" value="with_fries" checked> With Fries
答案 0 :(得分:1)
在app引擎Python中,您可以将Jinja2用于服务器端模板:
<form>
<h2>Food Name</h2>
<input type="text" name="food" value="{{ foodname }}">
<h2>Sides:<h2>
<input type="checkbox" name="sides" value="with_salad" {% if sides == "with_salad" %}checked{% endif %}> With Salad
<input type="checkbox" name="sides" value="with_fries" {% if sides == "with_fries" %}checked{% endif %}> With Fries
<input type="submit">
</form>
请参阅文档:https://developers.google.com/appengine/docs/python/gettingstartedpython27/templates