当绑定到属性(单向)时,有几个选项可以绑定attr-name.bind="variable"
(也尝试过单向和一次性)或使用插值attr-name="${variable}"
,但如果您尝试绑定到命名空间元素,例如 xlink :href 你目前得到:
未捕获的命名空间错误:无法在“元素”上执行“setAttributeNS”:“”是属性的无效命名空间。
对于在控制器 page.js 中有以下内容:
export class page {
constructor(){
this.icon = 'blah';
}
}
以及 page.html 中的以下内容:
<template>
<svg class="icon ${icon}">
<use xlink:href="${icon}"></use>
</svg>
</template>
正如我所说的,上面的任何一个绑定都抛出了给定的错误。
关于如何绑定到这个命名空间属性的任何想法?
检测 bootstrap handleApp 函数以打印完整的堆栈跟踪:
Error: Failed to execute 'setAttributeNS' on 'Element': '' is an invalid namespace for attributes.
at Error (native)
at OoPropertyObserver.setValue (http://localhost:9000/jspm_packages/github/aurelia/binding@0.3.3/system/property-observation.js:200:26)
at InterpolationBinding.setValue (http://localhost:9000/jspm_packages/github/aurelia/templating-binding@0.8.4/system/binding-language.js:214:35)
at InterpolationBinding.bind (http://localhost:9000/jspm_packages/github/aurelia/templating-binding@0.8.4/system/binding-language.js:202:22)
at View.bind (http://localhost:9000/jspm_packages/github/aurelia/templating@0.8.9/system/view.js:65:29)
at ViewFactory.create (http://localhost:9000/jspm_packages/github/aurelia/templating@0.8.9/system/view-factory.js:173:22)
at BoundViewFactory.create (http://localhost:9000/jspm_packages/github/aurelia/templating@0.8.9/system/view-factory.js:128:39)
at Repeat.processItems (http://localhost:9000/jspm_packages/github/aurelia/templating-resources@0.8.6/system/repeat.js:105:36)
at Repeat.bind (http://localhost:9000/jspm_packages/github/aurelia/templating-resources@0.8.6/system/repeat.js:60:22)
at BehaviorInstance.bind (http://localhost:9000/jspm_packages/github/aurelia/templating@0.8.9/system/behavior-instance.js:67:39)
此外,如果我破解属性观察代码以显式设置它工作的命名空间,但这确实很笨拙并且可能很快就会中断。
https://github.com/aurelia/binding/blob/master/src/property-observation.js#L153-L159改为:
setValue(newValue) {
if (this.isSVG) {
if(this.propertyName.indexOf('xlink:') >= 0){
this.obj.setAttributeNS("http://www.w3.org/1999/xlink", this.propertyName, newValue);
} else {
this.obj.setAttributeNS(null, this.propertyName, newValue);
}
} else {
this.obj[this.propertyName] = newValue;
}
}