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Qrcode在后台数据加载完成前，因没有this.value报错 #2070

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shiLinQing407 opened this issue Sep 30, 2017 · 2 comments
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Qrcode在后台数据加载完成前，因没有this.value报错 #2070

shiLinQing407 opened this issue Sep 30, 2017 · 2 comments

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@shiLinQing407
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<qrcode :value="member_data.card_no" :size="160" type="img"></qrcode>

:value 绑定后台加载过来的数据。在模板渲染时，因为数据还未加载完成，所以Qrcode/index.vue文件中：
第70行：
qrcode.addData(this.value)
value值为undefined，导致报错

vue.common.js?e881:481 [Vue warn]: Error in nextTick: "TypeError: Cannot read property 'length' of undefined"

请教大佬们有什么办法能不报错吗？（虽然不影响使用，反正有数据后会重新渲染一次）
@airyland
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暂时可以用 v-if 实现在有值时渲染。

@shiLinQing407
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多谢指教！

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@airyland @shiLinQing407