Angular2-根据值为元素设置不同的颜色

问题描述

我是Angular2的新手，想知道如何根据值将字体颜色设置为元素.

I am new to Angular2 and was wondering how I go about setting a font color to an element depending on the value.

我的情况是:如果输入字段的值不是100，那么我希望它是红色，但是如果它是100，那么我希望它是绿色.

My scenario is: if the value of the input field is not 100 then I want it red but if it is 100 then I want it green.

我有以下代码，但是无法正常工作.

I have the following code in place but cant get it working.

XXX.component.css

.red {
    color: red;
}

.green {
    color: green;
}

XXX.component.css

<input mdInput placeholder="Proportion '%'" [(ngModel)]="proportion ">
<p>hello <span ng-class='{red : proportion!= '100', green: proportion === '100'}'>{{proportion}}</span></p>

推荐答案

有两种解决方案来更改字体颜色，但要取决于您的要求

There are two solutions to change font color but depends on you requirement

1. 如果您需要更改嵌入式样式，则可以使用有角的NgStyle指令，该指令为您更新HTML元素样式.

1. If you requirement is change inline style then you can use angular NgStyle Directive which Update an HTML element styles for you..

NgStyle directive Ex:

<span [ngStyle]="{'color': proportion === '100' ? 'green' : 'red'}"></span>

        ---------------------- OR -----------------------------------

<span [style.color]="proportion === '100' ? 'green' : 'red'"></span>

1. 如果您需要更改类，则可以使用angular NgClass指令，该指令在HTML元素上添加和删除CSS类...

1. If you requirement is change class then you can use angular NgClass Directive which Adds and removes CSS classes on an HTML element...

NgClass directive Ex:

<span [ngClass]="{proportion === '100' ? 'green': 'red'}"></span>

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