Function getValueFromElem

Read the value from an HTML input element.

If a <span class="wb-col"> is passed, the first child input is used. Depending on the target element type, value is interpreted accordingly. For example for a checkbox, a value of true, false, or null is returned if the element is checked, unchecked, or indeterminate. For datetime input control a numerical value is assumed, etc.

Common use case: store the new user input in a change event handler:

  change: (e) => {
    const tree = e.tree;
    const node = e.node;
    // Read the value from the input control that triggered the change event:
    let value = tree.getValueFromElem(e.element);
    // and store it to the node model (assuming the column id matches the property name)
    node.data[e.info.colId] = value;
  },
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