wx:for and wx:for-item small program development

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Release: 2018-06-12 10:12:56
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This time I will bring you some precautions when developing wx:for and wx:for-item small programs. The following is a practical case. Let’s take a look.

wx:for="{{list}}" is used to loop through the array, and list is the array namewx:for-item="items" That is

used to define the variables of each element in a loop process. If it is a one-dimensional array, it is looped out as follows:

<view wx:for="{{list}}">
{{index}} {{item.name}}
</view>
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Copy after login

In the above code, item is the alias of list.

If it is a two-dimensional or even multi-dimensional array, loop as follows:

<view wx:for="{{parentList}}">
{{item.id}}
<view wx:for="{{item.childList}}" wx:for-item="items">
{{items.name}}{{item.account}}
</view>
</view>
for (var i = 0 ; i < list.length; i++) {
var xxx = list[i];
}
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is equivalent to

<view wx:for="{{list}}" wx:for-item="xxx"></view>
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Copy after login

Remember: wx:for is a loop array, wx:for-item That is to assign an alias to the list

The following are some incorrect uses, please use them with caution:

1. Use wx:for-item directly, which will not loop out the list

<view wx:for-item="{{list}}">
{{index}} {{item.name}}
</view>
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2. Use wx:for-item with caution in sub-loops

<view wx:for="{{parentList}}">
 {{item.id}}
 <view wx:for-item="{{item.childList}}" wx:for-item="items">
 {{items.name}}{{items.account}}
 </view>
Copy after login
Copy after login

The correct usage of wx:for and wx:for-item in WeChat applet

wx:for="{{ list}}" is used to loop the array, and list is the array name wx:for-item="items" which is used to define the variable of each element during the loop

If it is a one-dimensional array, Loop out as follows:

<view wx:for="{{list}}">
{{index}} {{item.name}}
</view>
Copy after login
Copy after login

In the above code, item is the alias of list.

If it is a two-dimensional or even multi-dimensional array, loop as follows:

<view wx:for="{{parentList}}">
{{item.id}}
<view wx:for="{{item.childList}}" wx:for-item="items">
{{items.name}}{{item.account}}
</view>
</view>
for (var i = 0 ; i < list.length; i++) {
var xxx = list[i];
}
Copy after login
Copy after login

is equivalent to

<view wx:for="{{list}}" wx:for-item="xxx"></view>
Copy after login
Copy after login

Remember: wx:for is a loop array, wx:for-item That is to assign an alias to the list

The following are some incorrect uses, please use them with caution:

1. Use wx:for-item directly, which will not loop out the list

<view wx:for-item="{{list}}">
{{index}} {{item.name}}
</view>
Copy after login
Copy after login

2. Use wx:for-item with caution in sub-loops

<view wx:for="{{parentList}}">
 {{item.id}}
 <view wx:for-item="{{item.childList}}" wx:for-item="items">
 {{items.name}}{{items.account}}
 </view>
Copy after login
Copy after login

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:

Summary of adding getter setter to JS

##How to use webpack react antd scaffolding in actual projects

The above is the detailed content of wx:for and wx:for-item small program development. For more information, please follow other related articles on the PHP Chinese website!

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