在我的django驱动的应用程序中,只有一个明显的情况可能会出现"IntegrityError".
那么,我如何捕获该错误并使用模板显示消息？
这是我的标记:
<a href="#" class="reviews" id="like" rel="popover" data-content="" data-placement="right" data-original-title="Like episode">
<i class="icon-thumbs-up"></i>
Loved it
</a>(<span id="episode_likes">{{ episode_likes }}</span>
这是JavaScript:
$('a.reviews#like').click(function(e){
var element = $(this);
$.ajax({
url: '/episoderatings/like/',
type: 'POST',
dataType: 'json',
data: {
csrfmiddlewaretoken: '{{ csrf_token }}',
episode_number: current,
story: current_story
},
success: function(response){
if(response=='You have liked this episode'){
$('span#episode_likes').text(parseInt($('span#episode_likes').text())+1);
}
$(element).attr('data-content',response);
$(element).popover();
}
});
e.preventDefault();
});
问题是,当我点击"喜欢"按钮时,弹出窗口没有出现在第一次点击,所以我错过了重要的回复我是否喜欢这个页面.当我点击"喜欢"按钮时,第二次弹出窗口会出现,然后从那里开始保持其切换行为.有任何想法吗？
在我的Android应用中,ratingbars不可见.它只有在触摸它时才会变得可见,一旦我脱下手指就会消失.
我的代码:
<RatingBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/myratingStars"
android:layout_gravity="center_horizontal|center_vertical|center"
android:numStars="5"/>
它不会在Lollipop模拟器/真实手机/ Android Studio设计窗口中呈现(在API 23模式下),而是在KitKat模拟器和Android设计窗口中呈现(在API 15模式下).
完整的布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="24dp"
android:orientation="vertical">
<RatingBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/myratingStars"
android:layout_gravity="center_horizontal|center_vertical|center"
android:numStars="5"/>
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:maxLines="10"
android:id="@+id/myratingTxt"
android:layout_marginTop="12dp"
android:layout_marginBottom="2dp"
android:hint="@string/write_review"/>
</android.support.design.widget.TextInputLayout>
<android.support.v7.widget.AppCompatButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/submitReview"
android:text="@string/review_submit"
android:layout_gravity="center_horizontal|center|center_vertical"
android:textColor="@color/white"
android:onClick="submitReview"
android:layout_marginTop="8dp"
tools:visibility="visible"/>
</LinearLayout>
</LinearLayout>
我知道这不是编码特定的问题,但这是最适合问这些问题的地方.所以请耐心等待我.
假设我有一个如下所示的字典,列出每个人的十个喜欢的项目
likes={
"rajat":{"music","x-men","programming","hindi","english","himesh","lil wayne","rap","travelling","coding"},
"steve":{"travelling","pop","hanging out","friends","facebook","tv","skating","religion","english","chocolate"},
"toby":{"programming","pop","rap","gardens","flowers","birthday","tv","summer","youtube","eminem"},
"ravi":{"skating","opera","sony","apple","iphone","music","winter","mango shake","heart","microsoft"},
"katy":{"music","pics","guitar","glamour","paris","fun","lip sticks","cute guys","rap","winter"},
"paul":{"office","women","dress","casuals","action movies","fun","public speaking","microsoft","developer"},
"sheila":{"heart","beach","summer","laptops","youtube","movies","hindi","english","cute guys","love"},
"saif":{"women","beach","laptops","movies","himesh","world","earth","rap","fun","eminem"}
"mark":{"pilgrimage","programming","house","world","books","country music","bob","tom hanks","beauty","tigers"},
"stuart":{"rap","smart girls","music","wrestling","brock lesnar","country music","public speaking","women","coding","iphone"},
"grover":{"skating","mountaineering","racing","athletics","sports","adidas","nike","women","apple","pop"},
"anita":{"heart","sunidhi","hindi","love","love songs","cooking","adidas","beach","travelling","flowers"},
"kelly":{"travelling","comedy","tv","facebook","youtube","cooking","horror","movies","dublin","animals"},
"dino":{"women","games","xbox","x-men","assassin's creed","pop","rap","opera","need for speed","jeans"},
"priya":{"heart","mountaineering","sky diving","sony","apple","pop","perfumes","luxury","eminem","lil wayne"},
"brenda":{"cute guys","xbox","shower","beach","summer","english","french","country music","office","birds"}
}
我怎样才能确定有相似喜欢的人.或者两个人最相似的人.如果你能指出适合基于用户或基于项目的过滤的示例或教程,那将会很有帮助.
我正在为我的django应用程序编写一些测试.在我看来,它使用'HttpResponseRedirect'重定向到其他网址.所以我该如何测试？
在我的模板中,我写道:
<div class="content video">{{ each.text }}</div>
我得到了:
<iframe width="300" height="200" src="http://www.youtube.com/embed/1C1HLH-hOZU" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowfullscreen></iframe>
我希望该文本成为标记的一部分,而不是文本.什么说？
我的系统有8 GB RAM,i5 Haswell Processor,2GB Nvidia Graphics card和512 GB HDD,还是我的系统是无法处理Android Studio(稳定和金丝雀版本).
它令人沮丧地缓慢并挂起整个系统.这应该是那样的吗？我是否需要更强大的系统来开发Android应用程序？它会影响生产力,我正在考虑完全放弃Android开发,因为浪费的时间和处理的挫败感Gradle.
有没有什么方法可以开发Android应用程序而不会感到沮丧,每一次？
编辑
有一个类似的问题
Android Studio很慢(如何加速)？,但我要问的是更新版本的Android Studio,谷歌声称(他们每年都说这些)已经制作significant enhancements了构建和任何流程.
更新2018年5月1日 我将系统升级到250 GB SSD,现在Android Studio似乎加载了一个数量级.
只是想知道有没有办法可以检查url是否链接到Django中的有效图像.
我读“算法设计”通过伊娃·塔尔多斯并在第3章中提到，邻接矩阵具有的复杂性O(n^2)，同时邻接表有O(m+n)其中m为边的总数，n为节点的总数。它说在邻接列表的情况下，我们只需要每个节点的大小为 m 的列表。
在邻接列表的情况下，我们不会得到类似于矩阵的东西，因为我们有列表，它们也是一维数组。所以基本上它是O(m*n)根据我的。请指导我。
我该如何将其全部更改<Img src='./assets/abc.svg'>为<Img src='cdn.example.com/abc.svg'>？基本上，我想转换图像源。
我知道--deployUrl和baseHref选项，但是那些事情似乎并没有改变imgs的src属性。请同时查看：https : //github.com/angular/angular-cli/issues/6666