# Javascript: TXTextControl.IfField.expression1 Property

> Specifies the first expression text that should be compared. This property must be a valid field name.

- **Product:** TX Text Control .NET Server
- **Section:** Reference
- **Kind:** Property
- **Introduced:** 25.0
- **Path:** TX Text Control .NET Server > Reference > JavaScript API > Javascript: TXTextControl.IfField.expression1 Property
- **179 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/txtextcontrol-iffield/expression1-property/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/txtextcontrol-iffield/expression1-property/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/txtextcontrol-iffield/expression1-property/llms-full.txt

---

### Description

Specifies the first expression text that should be compared. This property must be a valid field name.

### Syntax

```javascript
<string> TXTextControl.IfField.expression1
```

### Examples

The following example demonstrates `TXTextControl.IfField.expression1` in a practical document-editing workflow. It specifies the first expression text that should be compared. This property must be a valid field name.

```javascript
function inspectExpression1(ifField) {
    const expression1 = ifField.expression1;
    console.log("expression1:", expression1);
}
```

---

## Nearby

- **Previous:** [TXTextControl.IfField Object](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/txtextcontrol-iffield/llms-full.txt)
- **Next:** [Javascript: TXTextControl.IfField.expression2 Property](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/txtextcontrol-iffield/expression2-property/llms-full.txt)