Check documentation for the latest version of dhtmlxSuite selectTextRange DHTMLX Docs

selectTextRange

selects text in input/textarea

void selectTextRange(string|number|HTMLElement inp,number start,number end);
inpstring|number|HTMLElementid or object
startnumberstart position
endnumberend position

Example

var input = document.getElementById("someInputId");
window.dhx.selectTextRange(input, 0, input.value.length-1);

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