来自指令输入数组的角度样式 viewContainerRef [英] Angular styling viewContainerRef from Directive Input array
问题描述
我创建了一个使用可变长度数组来填充工具提示的指令.这很好用，但我需要动态设置工具提示的样式，以便它保留在初始触发器组件下.使用根据项目数量变化的顶部或底部值.
<div tooltipDirective [tooltipDataArray]="['Person1', 'Person2', 'Person3', 'Person4', 'Person5', 'Person6']">查看工具提示！<ng-template #tooltipTemplate ><div class="tooltip"[ngStyle]="{'top.px': divStyle}">//不确定这是否是正确的方法，因为无法绑定到指令中的 divStyle</ng-模板>
我尝试使用 ngStyle，但不确定如何访问 divStyle 值，因为这是使用 viewContainerRef.createEmbeddedView 创建的.
我认为更好的选择是使用 style.bottom 从 ts 文件添加样式，但我不知道如何添加.我需要计算 tooltipDataArray.length，然后将 10px 左右添加到重新定位 viewContainerRef 的变量中.我不确定继续的最佳方式.
@Input() tooltipDataArray: string[];@ContentChild("tooltipTemplate") private tooltipTemplateRef: TemplateRef如果您愿意将 templateRef 作为指令的输入传入，这会容易得多...<块引用>
使用您当前的实现，您将替换div 带有模板的渲染内容...
- 这本质上是不是工具提示，您需要以某种方式将它们解耦以模拟工具提示"
以下是您可以实现此目的的一种方法.
将 ng-template 与 div 分离以将它们解耦，并将您的 #tooltipTemplate 作为值传递给 [templateRef] 输入在 指令
<ng-template #tooltipTemplate><div class="tooltip">这是我的工具提示！
</ng-模板>
在您的指令中，将您的 @ContentChild 转换为接收 templateRef 的输入，创建您的 embeddedView 并添加您的 array 元素.
- 这也简化了您的逻辑
@Input() templateRef: TemplateRef调整全局样式
.tooltip {位置:绝对；/* 底部:-40px;*/左:15px；填充:10px；背景:红色；边框半径:5px；/* box-shadow: 0 2px 1px rgba(0, 0, 0, 0.6);*/}STACKBLITZ
https://stackblitz.com/edit/angular-zr2ydx?file=app/tooltip.directive.ts
这将是您提供的脚手架的最干净的实现……也就是说，如果我要实现工具提示指令，我会研究 CDK Overlay 以创建自定义工具提示实现.
I have created a directive that uses a variable length array to populate a tooltip. This works great but I need to dynamically style the tooltip so it remains under the initial trigger component. Using a top or bottom value that changes based on the number of items.
<div tooltipDirective [tooltipDataArray]="['Person1', 'Person2', 'Person3', 'Person4', 'Person5', 'Person6']">See tooltip!
<ng-template #tooltipTemplate >
<div class="tooltip" [ngStyle]="{'top.px': divStyle}"> // Not sure if this is the correct approach as can't bind to divStyle in the directive
</div>
</ng-template>
</div>
I tried using ngStyle but am unsure how to get access to the divStyle value because this is created using viewContainerRef.createEmbeddedView.
I thought a better option would be to add the styles from the ts file using style.bottom but I don't know how to add that. I need to calculate tooltipDataArray.length then add 10px or so to a variable that repositions the viewContainerRef. I'm not sure of the best way to proceed.
@Input() tooltipDataArray: string[];
@ContentChild("tooltipTemplate") private tooltipTemplateRef: TemplateRef<Object>;
@HostListener("mouseenter") onMouseEnter(): void {
console.log(this.tooltipDataArray);
const view = this.viewContainerRef.createEmbeddedView(
this.tooltipTemplateRef
);
this.tooltipDataArray.forEach(el => {
const child = document.createElement("div");
child.innerText = el;
this.renderer.appendChild(view.rootNodes[1], child);
});
// Somthing like this.viewContainerRef.styles.bottom = 10 x this.tooltipDataArray.length + 'px'
console.log(view.rootNodes)
view.rootNodes.forEach(node => {
this.renderer.appendChild(this.elementRef.nativeElement, node);
});
}
@HostListener("mouseleave") onMouseLeave(): void {
if (this.viewContainerRef) {
this.viewContainerRef.clear();
}
If you were willing to pass in the templateRef as an input to the directive this would be a lot easier...
With your current implementation you are replacing the content of the
divwith the rendered content of the template...
- This essentially is not a tooltip and you would need to decouple them somehow to "simulate a tooltip"
Below is one way you could accomplish this.
Separate the ng-template from the div to decouple them, and pass your #tooltipTemplate as a value to the [templateRef] input on the directive
<div tooltipDirective [templateRef]="tooltipTemplate" [tooltipDataArray]="['Person1', 'Person2']">See tooltip!
</div>
<ng-template #tooltipTemplate>
<div class="tooltip">
This is my tooltip!
</div>
</ng-template>
In your directive convert your @ContentChild to an input to receive the templateRef, create your embeddedView and add your array elements.
- This also simplifies your logic here
@Input() templateRef: TemplateRef<Object>;
@HostListener("mouseenter") onMouseEnter(): void {
const view = this.viewContainerRef.createEmbeddedView(this.templateRef);
this.tooltipDataArray.forEach(el => {
const child = document.createElement("div");
child.innerText = el;
this.renderer.appendChild(view.rootNodes[1], child);
});
}
Adjust your global styling
.tooltip {
position: absolute;
/* bottom: -40px; */
left: 15px;
padding: 10px;
background: red;
border-radius: 5px;
/* box-shadow: 0 2px 1px rgba(0, 0, 0, 0.6); */
}
STACKBLITZ
https://stackblitz.com/edit/angular-zr2ydx?file=app/tooltip.directive.ts
This would be the cleanest implementation with the scaffolding you have provided... with that said, if I were to implement a tooltip directive, I would research CDK Overlay to create a custom tooltip implementation.
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