We can use a javascript function getElementById() in place of form name.
Example:
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<script>
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function use_of_getelement()
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{
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var text = document.getElementById(‘text_box_text’).value;
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alert("you have written "+text);
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}
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</script>
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<input id="text_box_text" type="text" value="Just Write Something" />
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<input onclick="use_of_getelement()" name="button" type="button" value="Show My Text" />
Demo:
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