Hey there! I totally get the frustration when you switch from sap.ui.commons.TextArea to sap.m.TextArea and realize the handy setDesign(sap.ui.core.Design.Monospace) method is nowhere to be found. No worries though—there are a couple of straightforward ways to replicate that monospace font behavior.

Method 1: Custom CSS Class (Cleanest & Recommended) #

This is the best approach if you plan to reuse the monospace style across multiple TextAreas.

1. Create a custom CSS class in your app's stylesheet (like myStyles.css):

.monospace-textarea .sapMTextAreaInner {
    font-family: "Courier New", Courier, monospace;
}

We target the inner sapMTextAreaInner element because that's where the text content lives—this ensures the font applies correctly, even if SAPUI5's internal structure changes a bit.

2. Apply the class to your TextArea:

• In XML View:

<TextArea class="monospace-textarea" value="Sample monospace text here..." />

• In JavaScript:

new sap.m.TextArea({
    value: "Sample monospace text here...",
    width: "100%",
    class: "monospace-textarea"
});

Method 2: Inline Style (Quick One-Off Fix) #

If you only need monospace font for a single TextArea, you can skip the CSS class and apply the style directly:

• In XML View:

<TextArea value="Sample monospace text here..." style="font-family: 'Courier New', Courier, monospace;" />

• In JavaScript:

new sap.m.TextArea({
    value: "Sample monospace text here...",
    width: "100%",
    style: "font-family: 'Courier New', Courier, monospace;"
});

Method 3: Global Theme Override (All TextAreas) #

Want every sap.m.TextArea in your app to use monospace font? Override the default theme style:

.sapMTextAreaInner {
    font-family: "Courier New", Courier, monospace !important;
}

Use !important only if the default theme styles are overriding your custom styles—try to avoid it if possible, as it can make future style changes trickier.

Just make sure your custom CSS is properly loaded in your SAPUI5 app (either via your component's includeStylesheets configuration or added to your index.html). All these methods will give you the same monospace look you had with the old sap.ui.commons.TextArea control.

内容的提问来源于stack exchange，提问作者Annie W.