Summarize several methods of passing and obtaining values in the development of WeChat mini programs-Mini Program Development-php.cn

This article mainly introduces the relevant information summarized by several methods of transferring and obtaining values in WeChat mini programs. Here are detailed explanations of these methods, and sample codes are attached. Friends in need can refer to it

WeChat applet passing value

The common values in the applet are as follows. If you write down a complete project, the probability of using it is almost 100%.

List index subscript value
Page value passing
form form value

1. List index subscript value

The implementation method is: data-index="{{index}}" digging and e .currentTarget.dataset.index to fill in the pit

1.1 Generate value

删除

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Add data-index="{{index to the delete icon and text }}"Custom attributes and binding click events bindtap="delete"

         
          删除

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Implement the delete method and get the index subscript value.

delete: function (e) { var index = parseInt(e.currentTarget.dataset.index); console.log("index" + index); }

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What happens if e.target is used instead of e.currentTarget?

will cause the index value to be output only if the is clicked, and the click element or will output NaN.

Then what is the use of target? It is used to distinguish sub-elements from external elements when they need to be processed separately, such as when changing the user's avatar, click on the avatar itself to preview the large image, and Click the entire line where the avatar is to switch the avatar.

For detailed explanation of the difference between the two, please see the document: https://mp.weixin.qq.com/debug/wxadoc/dev/framework/view/wxml /event.html

1.2 Get the value

Try to find the corresponding element deletion address from the index data

// 找到当前地址AVObject对象 var address = that.data.addressObjects[index]; // 给出确认提示框 wx.showModal({ title: '确认', content: '要删除这个地址吗？', success: function(res) { if (res.confirm) { // 真正删除对象 address.destroy().then(function (success) { // 删除成功提示 wx.showToast({ title: '删除成功', icon: 'success', duration: 2000 }); // 重新加载数据 that.loadData(); }, function (error) { }); } } })

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2 .Page value

Pass the address id from the shipping address list page to the edit page to read the original address for modification.

The address/list page implements the following code

编辑 edit: function (e) { var that = this; // 取得下标 var index = parseInt(e.currentTarget.dataset.index); // 取出id值 var objectId = this.data.addressObjects[index].get('objectId'); wx.navigateTo({ url: '../add/add?objectId='+objectId }); },

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The address/add page implements the onLoad(options) method to obtain the objectId from the url path

onLoad: function (options) { var objectId = options.objectId }

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Then it’s time to access the network and render the page.

3. Form form value

3.1 Method 1, through

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// 实现相应多个**Confirm方式 detailConfirm: function(e) { var detail = e.detail.value; } realnameConfirm: function(e) { var realname = e.detail.value; } mobileConfirm: function(e) { var mobile = e.detail.value; }

It can be seen from the comparison between method one and method two that although they can also achieve the goal of obtaining values, their usage scenarios are different. Different, the former is suitable for submitting a large number of form items, such as users completing personal information and filling in the delivery address; while the latter is suitable for only one or two form items, such as entering a courier number and binding a mobile phone number.

If you need an immediate response similar to ajax, you should choose the latter, because input can useto get the value instantly, such as entering mobile phone keywords in the product search box. Scenarios such as iPhone7, Mate8 and other candidate words should appear.

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