AngularJS路由问题解决
遇到了一个棘手的问题：点击优惠详情时总是跳转到药店详情页面中去。再加一层地址解决了，但是后来发现问题还是来了:
Could not resolve 'yhDtlMaintain/yhdetail' from state 'yhMaintain'
药店详情
优惠券详情
优惠活动详情
经过url的对比，自己发现了问题。其中药店详情和优惠券详情的url是相同的。而之前自己在优惠活动详情中改动了一下，结果正常显示。然后自己接着查看优惠活动的修改地方，发现:
/*--------------------------优惠活动详情维护--------------------------*/
.state('yhhdDtlMaintain', {
url: '/index/{yhid}',
views: { //注意这里的写法，当一个页面上带有多个ui-view的时候如何进行命名和视图模板的加载动作
'': {
templateUrl: 'rightInfoList.html'
},
'sys_banner@yhhdDtlMaintain': {
templateUrl: 'sys_banner.html'
},
'rightContent@yhhdDtlMaintain': {
templateUrl: function($stateParams){
console.log("YHID:");
console.log($stateParams);
return 'yh_set_dtl.html';
}
}
}
})
玄机藏在url中，其实这个url是在浏览器中访问的url，基于用户浏览该应用所在的状态。同理，自己修改了优惠券详情的路由，如下:
/*-----------------------------优惠券详情维护-----------------------------*/
.state('yhqDtlMaintain', {
url: '/yhqIndex/{yhid}',
views: { //注意这里的写法，当一个页面上带有多个ui-view的时候如何进行命名和视图模板的加载动作
'': {
templateUrl: 'rightInfoList.html'
},
'sys_banner@yhqDtlMaintain': {
templateUrl: 'sys_banner.html'
},
'rightContent@yhqDtlMaintain': {
templateUrl: function($stateParams){
console.log("YHQID:");
console.log($stateParams);
return 'yh_set_dtl.html';
}
}
}
})
这样所有的问题就迎刃而解了。但自己还是需要深入理解一下相关原理。若之前不做修改的话，优惠券详情的url就会与药店详情相同，药店详情页面覆盖了优惠券详情页面。
ANGULAR.JS: NG-SELECT AND NG-OPTIONS
PS:其实看英文文档比看中文文档更容易理解，前提是你的英语基础还可以。英文文档对于知识点讲述简明扼要，通俗易懂，而有些中文文档读起来特别费力，基础差、底子薄的有可能一会就会被绕晕了，最起码英文文档中的代码与中文文档中的代码是一致的，但知识点讲述实在是差距太大。
Angular.js has a powerful directive waiting for you: it's ng-select. With it you can fill an HTML-select box from your model. It supports a pretty cool selector syntax, which is - unfortunately - a little bit tricky.
Let's assume you have a JSON stream which looks like this:
{
"myOptions": [
{
"id": 106,
"group": "Group 1",
"label": "Item 1"
},
{
"id": 107,
"group": "Group 1",
"label": "Item 2"
},
...
}
// Get stream in the object called data
$scope.myOptions = data.myOptions;
The good thing is, you have a pretty flat data stream. When I started with this feature, I had an array of groups each containing the specific items.
It was not possible for me to fill a select box that way. Instead, I refactored some of my code to what you can see above.
Angular.js would take care of the grouping on it's own.
Here is my select definition:
<select
ng-model="myOption"
ng-options="value.id as value.label group by value.group for value in myOptions">
<option>--</option>
</select>
ng-model is the name of the property which will reference the selected option. ng-options is the directive which fills the dropdown. It deserves a bit more attention.
You will understand it more easily if you read it from right to left. First there is:
for value in myOptions
It means you'll iterate through elements which are stored in myOptions. Every element will become available in this expression with the name "value".
The next part is:
group by value.group
This will tell Angular.js to make up
<optgroup>
tags and the label attribute will be filled with the content of the group field.
The last one is:
value.id as value.label
In this case, value.id will become the model (stored in ng-model), if your users have chosen an option. If you would delete "value.id as", simply the whole value object would become the model.
value.label
does exactly what it looks like: it's the label of the select box.
If you run your code, you'll see something like that:
<optgroup label="Group 1">
<option value="0">Item 1</option>
<option value="1">Item 2</option>
</optgroup>
Please look again and check the value attribute of the options. You might have expected it's matching the IDs from your JSON,
but that is not the case (and yes, I thought like this initially). Actually this is an increasing number and references the position of the model
(which is an array in my case). Don't worry about that - if you select your option the correct ID will be selected and put into your model.
Or, if you leave out the value.id part of the expression, the whole selected object will become your model.You can easily test it.
<select
ng-change="selectAction()"
ng-model="myOption"
ng-options="value.id as value.label group by value.group for value in myOptions">
<option>--</option>
</select>
ng-change will fire if the user has chosen something. You can output it by typing:
$scope.selectAction = function() {
console.log($scope.myOption);
};
I find the syntax of ng-options pretty much counter intuitive. It took me a good while to understand it and I was glad about the nice help on the AngularJS mailinglist.
That said, I think more examples on the docs and an improved syntax would really help. Like:
foreach value in myOptions use value.label as label use value.id as model group by value.group
Here is a working JS fiddle example which illustrates the use of the ng-select directive: http://jsfiddle.net/jm6of9bu/2/
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