Use javascript to add control custom attribute parsing_javascript skills

As mentioned before, adding custom attributes to HTML elements is done manually in the HTML control. In fact, it can be added dynamically in javascript: If there is a text box:

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If you want to add the idvalue attribute (the value is "custom value"), you can write this in javascript:

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var txt = document.getElementById("txtInput");
txt.setAttribute("idvalue","custom value" );

The first parameter in setAttribute specifies the name of the custom attribute, and the second parameter is the initial value

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