Disabling Form Elements
In some cases, you may not want visitors to use certain parts of your form. For example, you might want to disable a submit button until all the required fields have been filled out.
Figure 17.58. Here, I use JavaScript and the disabled attribute to make the submit button inaccessible until other options are selected.
To disable a form element:
In the form element’s tag, type disabled="disabled".
Figure 17.59. When the visitor first views the form, nothing is selected and the submit button is disabled.
Figure 17.60. ...
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