Update the Material UI input field value using an external JavaScript script

Question

Update the Material UI input field value using an external JavaScript script

Imagine I find myself exploring an online form that utilizes Material UI components, for instance, this example link.

I am interested in automatically filling the input fields with a specific value using JavaScript in the console:

for (input of document.getElementsByTagName('input')) {
  input.value = "new value";
  console.log(input.value);
}

Initially, it seems to work since the input fields reflect the updated values and the console logs confirm the change. However, despite this, the visual display showing "Your input value is: test" remains unchanged and reverting back once the input field is clicked.

Is there a way to create an external JavaScript script that can truly alter the input field's value? It appears to be more complex than expected—possibly involving event dispatching methods?

javascript forms material-ui textfield form-fields

Answer 1

Answer №1

Try following these steps:

Locate the Material UI input field (e.g. by its class name)
Identify the property named __reactPropsxxxxx (the last part varies each time)
Trigger the onChange function

Here is a sample code snippet to achieve this:

for (inputField of document.getElementsByClassName("MuiInput-input")) {
  for (prop in inputField) {
    if (prop.startsWith("__reactProps")) {
      inputField[prop].onChange({target: {value: "changed!"}});
      break;
    }
  }
}

Answer 2

Try following these steps:

Locate the Material UI input field (e.g. by its class name)
Identify the property named __reactPropsxxxxx (the last part varies each time)
Trigger the onChange function

Here is a sample code snippet to achieve this:

for (inputField of document.getElementsByClassName("MuiInput-input")) {
  for (prop in inputField) {
    if (prop.startsWith("__reactProps")) {
      inputField[prop].onChange({target: {value: "changed!"}});
      break;
    }
  }
}

Update the Material UI input field value using an external JavaScript script

Answer №1

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