c# - How can I make a Sharepoint textbox (input, type=text) dynamically Multiline? -

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i want textbox on web part grow vertically on demand. is, 1 line unless user enters text line, @ point word wraps , grows vertically accommodate verbosity of user.

i creating controls/elements dynamically, , create element so:

boxpaymentexplanation = new textbox() {     cssclass = "dplatypus-webform-field-input" }; boxpaymentexplanation.width = 660; boxpaymentexplanation.style.add("display", "inline-block");

i tried adding line, in hopes of achieving functionality:

boxpaymentexplanation.style.add("textmode", "multiline");

...but makes no apparent change textbox's behavior - can enter text "until bovines come barn" keeps adding characters end of textbox on single row. never wraps, never grows.

update

this jquery works (derived link christopher jennings provided):

$(document).on("keyup", "[id$=explainpaymenttextbox]", function (e) {     while ($(this).outerheight() < this.scrollheight + parsefloat($(this).css("bordertopwidth")) + parsefloat($(this).css("borderbottomwidth"))) {         $(this).height($(this).height() + 1);     }; });

...along c#:

boxpaymentexplanation = new textbox() {     cssclass = "dplatypus-webform-field-input",     id = "explainpaymenttextbox" }; boxpaymentexplanation.width = 660; boxpaymentexplanation.style.add("display", "inline-block"); boxpaymentexplanation.textmode = textboxmode.multiline;

update 2

unfortunately, although descent-into-the-mælström-esque jquery above works dynamically growing textbox, doesn't work if user removes text; shrink when happens...

you're on right track. need set textmode property multiline. however, approach took add html tag attribute rather set .net property. replace boxpaymentexplanation.style.add("textmode", "multiline"); boxpaymentexplanation.textmode = textboxmode.multiline;


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