10 examples of 'javascript check if element exists' in JavaScript

141
function isVisible(element_id) {
142
	var elm = document.getElementById(element_id);
143
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	return elm && elm.style.display != "none";
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}

8
function checkInputElement(elementId) {
9
    var element = document.getElementById(elementId);
10
    return element == null || (element.value || '') !== '';
11
}

66
checkElementId(element, index: number) {
67
  return element.id === `${this.workflow.settings.itemIdPrefix}${index}`;
68
}

20
function doesElementExist(selector: string): boolean {
21
  return fixture.debugElement.queryAll(By.css(selector)).length > 0;
22
}

87
function check_validation(element_id)
88
{
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	if(!($(element_id).val()))
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	{
91
		$(element_id).parent().parent().parent().addClass("errors");
92
		$(element_id).parent().parent().parent().children('ul').show();
93
		$("#errornote").show();
94
		return true;
95
	}
96
	else
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		return false;
98
}

10
elementTagExists(tag : string) {
11
    return element(by.tagName(tag)).isPresent();
12
}

218
_selector_exists() {
219
  return $(this.chart_selector).length > 0;
220
}

1
function jsCheck(id)
2
{
3
 el=document.getElementById(id);
4
 el.checked='checked';
5
}

247
function elementByCssExists(selector, delay = 2000) {
248
    return driver.waitForElementByCss(selector, delay)
249
           .should.eventually.exist;
250
}

11
async elementExists(selector, frameId = 0) {
12
  // console.log(`check for  ${selector} in tab ${this.id}, frame ${frameId}`);
13
  return browser.tabs.sendMessage(this.id, {
14
    type: 'elemExists',
15
    selector,
16
  }, {
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    frameId,
18
  });
19
}